CVE-2026-20084 (GCVE-0-2026-20084)
Vulnerability from cvelistv5 – Published: 2026-03-25 16:02 – Updated: 2026-03-26 17:35
VLAI
EPSS
VEX
Summary
A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition.
This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition.
Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.
There are workarounds that address this vulnerability.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-26 17:35 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Cisco | Cisco IOS XE Software |
Affected:
16.6.1
Affected: 16.6.2 Affected: 16.6.3 Affected: 16.6.4 Affected: 16.6.5 Affected: 16.6.4a Affected: 16.6.6 Affected: 16.6.7 Affected: 16.6.8 Affected: 16.6.9 Affected: 16.6.10 Affected: 16.7.1 Affected: 16.8.1 Affected: 16.8.1a Affected: 16.8.1s Affected: 16.9.1 Affected: 16.9.2 Affected: 16.9.1s Affected: 16.9.3 Affected: 16.9.4 Affected: 16.9.5 Affected: 16.9.6 Affected: 16.9.7 Affected: 16.9.8 Affected: 16.10.1 Affected: 16.10.1s Affected: 16.10.1e Affected: 16.11.1 Affected: 16.11.1b Affected: 16.11.1s Affected: 16.12.1 Affected: 16.12.1s Affected: 16.12.1c Affected: 16.12.2 Affected: 16.12.3 Affected: 16.12.8 Affected: 16.12.2s Affected: 16.12.4 Affected: 16.12.3s Affected: 16.12.3a Affected: 16.12.4a Affected: 16.12.5 Affected: 16.12.6 Affected: 16.12.5b Affected: 16.12.6a Affected: 16.12.7 Affected: 17.1.1 Affected: 17.1.1s Affected: 17.1.1t Affected: 17.1.3 Affected: 17.2.1 Affected: 17.2.1a Affected: 17.3.1 Affected: 17.3.2 Affected: 17.3.3 Affected: 17.3.2a Affected: 17.3.4 Affected: 17.3.5 Affected: 17.3.6 Affected: 17.3.7 Affected: 17.3.8 Affected: 17.3.8a Affected: 17.4.1 Affected: 17.5.1 Affected: 17.6.1 Affected: 17.6.2 Affected: 17.6.3 Affected: 17.6.1y Affected: 17.6.4 Affected: 17.6.5 Affected: 17.6.6 Affected: 17.6.6a Affected: 17.6.5a Affected: 17.6.7 Affected: 17.6.8 Affected: 17.7.1 Affected: 17.10.1 Affected: 17.10.1b Affected: 17.8.1 Affected: 17.9.1 Affected: 17.9.2 Affected: 17.9.3 Affected: 17.9.4 Affected: 17.9.5 Affected: 17.9.4a Affected: 17.9.6 Affected: 17.9.6a Affected: 17.9.7 Affected: 17.9.8 Affected: 17.11.1 Affected: 17.12.1 Affected: 17.12.2 Affected: 17.12.3 Affected: 17.12.4 Affected: 17.12.5 Affected: 17.12.1z5 Affected: 17.13.1 Affected: 17.14.1 Affected: 17.15.1 Affected: 17.15.2 Affected: 17.15.3 Affected: 17.15.2b Affected: 17.15.4 Affected: 17.15.4d Affected: 17.16.1 Affected: 17.17.1 Affected: 17.18.1 |
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-20084",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-26T17:35:41.843290Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-03-26T17:35:50.008Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "Cisco IOS XE Software",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "16.6.1"
},
{
"status": "affected",
"version": "16.6.2"
},
{
"status": "affected",
"version": "16.6.3"
},
{
"status": "affected",
"version": "16.6.4"
},
{
"status": "affected",
"version": "16.6.5"
},
{
"status": "affected",
"version": "16.6.4a"
},
{
"status": "affected",
"version": "16.6.6"
},
{
"status": "affected",
"version": "16.6.7"
},
{
"status": "affected",
"version": "16.6.8"
},
{
"status": "affected",
"version": "16.6.9"
},
{
"status": "affected",
"version": "16.6.10"
},
{
"status": "affected",
"version": "16.7.1"
},
{
"status": "affected",
"version": "16.8.1"
},
{
"status": "affected",
"version": "16.8.1a"
},
{
"status": "affected",
"version": "16.8.1s"
},
{
"status": "affected",
"version": "16.9.1"
},
{
"status": "affected",
"version": "16.9.2"
},
{
"status": "affected",
"version": "16.9.1s"
},
{
"status": "affected",
"version": "16.9.3"
},
{
"status": "affected",
"version": "16.9.4"
},
{
"status": "affected",
"version": "16.9.5"
},
{
"status": "affected",
"version": "16.9.6"
},
{
"status": "affected",
"version": "16.9.7"
},
{
"status": "affected",
"version": "16.9.8"
},
{
"status": "affected",
"version": "16.10.1"
},
{
"status": "affected",
"version": "16.10.1s"
},
{
"status": "affected",
"version": "16.10.1e"
},
{
"status": "affected",
"version": "16.11.1"
},
{
"status": "affected",
"version": "16.11.1b"
},
{
"status": "affected",
"version": "16.11.1s"
},
{
"status": "affected",
"version": "16.12.1"
},
{
"status": "affected",
"version": "16.12.1s"
},
{
"status": "affected",
"version": "16.12.1c"
},
{
"status": "affected",
"version": "16.12.2"
},
{
"status": "affected",
"version": "16.12.3"
},
{
"status": "affected",
"version": "16.12.8"
},
{
"status": "affected",
"version": "16.12.2s"
},
{
"status": "affected",
"version": "16.12.4"
},
{
"status": "affected",
"version": "16.12.3s"
},
{
"status": "affected",
"version": "16.12.3a"
},
{
"status": "affected",
"version": "16.12.4a"
},
{
"status": "affected",
"version": "16.12.5"
},
{
"status": "affected",
"version": "16.12.6"
},
{
"status": "affected",
"version": "16.12.5b"
},
{
"status": "affected",
"version": "16.12.6a"
},
{
"status": "affected",
"version": "16.12.7"
},
{
"status": "affected",
"version": "17.1.1"
},
{
"status": "affected",
"version": "17.1.1s"
},
{
"status": "affected",
"version": "17.1.1t"
},
{
"status": "affected",
"version": "17.1.3"
},
{
"status": "affected",
"version": "17.2.1"
},
{
"status": "affected",
"version": "17.2.1a"
},
{
"status": "affected",
"version": "17.3.1"
},
{
"status": "affected",
"version": "17.3.2"
},
{
"status": "affected",
"version": "17.3.3"
},
{
"status": "affected",
"version": "17.3.2a"
},
{
"status": "affected",
"version": "17.3.4"
},
{
"status": "affected",
"version": "17.3.5"
},
{
"status": "affected",
"version": "17.3.6"
},
{
"status": "affected",
"version": "17.3.7"
},
{
"status": "affected",
"version": "17.3.8"
},
{
"status": "affected",
"version": "17.3.8a"
},
{
"status": "affected",
"version": "17.4.1"
},
{
"status": "affected",
"version": "17.5.1"
},
{
"status": "affected",
"version": "17.6.1"
},
{
"status": "affected",
"version": "17.6.2"
},
{
"status": "affected",
"version": "17.6.3"
},
{
"status": "affected",
"version": "17.6.1y"
},
{
"status": "affected",
"version": "17.6.4"
},
{
"status": "affected",
"version": "17.6.5"
},
{
"status": "affected",
"version": "17.6.6"
},
{
"status": "affected",
"version": "17.6.6a"
},
{
"status": "affected",
"version": "17.6.5a"
},
{
"status": "affected",
"version": "17.6.7"
},
{
"status": "affected",
"version": "17.6.8"
},
{
"status": "affected",
"version": "17.7.1"
},
{
"status": "affected",
"version": "17.10.1"
},
{
"status": "affected",
"version": "17.10.1b"
},
{
"status": "affected",
"version": "17.8.1"
},
{
"status": "affected",
"version": "17.9.1"
},
{
"status": "affected",
"version": "17.9.2"
},
{
"status": "affected",
"version": "17.9.3"
},
{
"status": "affected",
"version": "17.9.4"
},
{
"status": "affected",
"version": "17.9.5"
},
{
"status": "affected",
"version": "17.9.4a"
},
{
"status": "affected",
"version": "17.9.6"
},
{
"status": "affected",
"version": "17.9.6a"
},
{
"status": "affected",
"version": "17.9.7"
},
{
"status": "affected",
"version": "17.9.8"
},
{
"status": "affected",
"version": "17.11.1"
},
{
"status": "affected",
"version": "17.12.1"
},
{
"status": "affected",
"version": "17.12.2"
},
{
"status": "affected",
"version": "17.12.3"
},
{
"status": "affected",
"version": "17.12.4"
},
{
"status": "affected",
"version": "17.12.5"
},
{
"status": "affected",
"version": "17.12.1z5"
},
{
"status": "affected",
"version": "17.13.1"
},
{
"status": "affected",
"version": "17.14.1"
},
{
"status": "affected",
"version": "17.15.1"
},
{
"status": "affected",
"version": "17.15.2"
},
{
"status": "affected",
"version": "17.15.3"
},
{
"status": "affected",
"version": "17.15.2b"
},
{
"status": "affected",
"version": "17.15.4"
},
{
"status": "affected",
"version": "17.15.4d"
},
{
"status": "affected",
"version": "17.16.1"
},
{
"status": "affected",
"version": "17.17.1"
},
{
"status": "affected",
"version": "17.18.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. \r\n\r This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. \r\n\r Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.\r\n\r There are workarounds that address this vulnerability."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "Uncontrolled Resource Consumption",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-25T16:02:39.119Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-bootp-WuBhNBxA",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA"
}
],
"source": {
"advisory": "cisco-sa-bootp-WuBhNBxA",
"defects": [
"CSCwq07617"
],
"discovery": "EXTERNAL"
}
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20084",
"datePublished": "2026-03-25T16:02:39.119Z",
"dateReserved": "2025-10-08T11:59:15.366Z",
"dateUpdated": "2026-03-26T17:35:50.008Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-20084",
"date": "2026-10-01",
"epss": "0.00354",
"percentile": "0.2668"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"product": "Cisco IOS XE Software",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "16.6.1"
},
{
"status": "affected",
"version": "16.6.2"
},
{
"status": "affected",
"version": "16.6.3"
},
{
"status": "affected",
"version": "16.6.4"
},
{
"status": "affected",
"version": "16.6.5"
},
{
"status": "affected",
"version": "16.6.4a"
},
{
"status": "affected",
"version": "16.6.6"
},
{
"status": "affected",
"version": "16.6.7"
},
{
"status": "affected",
"version": "16.6.8"
},
{
"status": "affected",
"version": "16.6.9"
},
{
"status": "affected",
"version": "16.6.10"
},
{
"status": "affected",
"version": "16.7.1"
},
{
"status": "affected",
"version": "16.8.1"
},
{
"status": "affected",
"version": "16.8.1a"
},
{
"status": "affected",
"version": "16.8.1s"
},
{
"status": "affected",
"version": "16.9.1"
},
{
"status": "affected",
"version": "16.9.2"
},
{
"status": "affected",
"version": "16.9.1s"
},
{
"status": "affected",
"version": "16.9.3"
},
{
"status": "affected",
"version": "16.9.4"
},
{
"status": "affected",
"version": "16.9.5"
},
{
"status": "affected",
"version": "16.9.6"
},
{
"status": "affected",
"version": "16.9.7"
},
{
"status": "affected",
"version": "16.9.8"
},
{
"status": "affected",
"version": "16.10.1"
},
{
"status": "affected",
"version": "16.10.1s"
},
{
"status": "affected",
"version": "16.10.1e"
},
{
"status": "affected",
"version": "16.11.1"
},
{
"status": "affected",
"version": "16.11.1b"
},
{
"status": "affected",
"version": "16.11.1s"
},
{
"status": "affected",
"version": "16.12.1"
},
{
"status": "affected",
"version": "16.12.1s"
},
{
"status": "affected",
"version": "16.12.1c"
},
{
"status": "affected",
"version": "16.12.2"
},
{
"status": "affected",
"version": "16.12.3"
},
{
"status": "affected",
"version": "16.12.8"
},
{
"status": "affected",
"version": "16.12.2s"
},
{
"status": "affected",
"version": "16.12.4"
},
{
"status": "affected",
"version": "16.12.3s"
},
{
"status": "affected",
"version": "16.12.3a"
},
{
"status": "affected",
"version": "16.12.4a"
},
{
"status": "affected",
"version": "16.12.5"
},
{
"status": "affected",
"version": "16.12.6"
},
{
"status": "affected",
"version": "16.12.5b"
},
{
"status": "affected",
"version": "16.12.6a"
},
{
"status": "affected",
"version": "16.12.7"
},
{
"status": "affected",
"version": "17.1.1"
},
{
"status": "affected",
"version": "17.1.1s"
},
{
"status": "affected",
"version": "17.1.1t"
},
{
"status": "affected",
"version": "17.1.3"
},
{
"status": "affected",
"version": "17.2.1"
},
{
"status": "affected",
"version": "17.2.1a"
},
{
"status": "affected",
"version": "17.3.1"
},
{
"status": "affected",
"version": "17.3.2"
},
{
"status": "affected",
"version": "17.3.3"
},
{
"status": "affected",
"version": "17.3.2a"
},
{
"status": "affected",
"version": "17.3.4"
},
{
"status": "affected",
"version": "17.3.5"
},
{
"status": "affected",
"version": "17.3.6"
},
{
"status": "affected",
"version": "17.3.7"
},
{
"status": "affected",
"version": "17.3.8"
},
{
"status": "affected",
"version": "17.3.8a"
},
{
"status": "affected",
"version": "17.4.1"
},
{
"status": "affected",
"version": "17.5.1"
},
{
"status": "affected",
"version": "17.6.1"
},
{
"status": "affected",
"version": "17.6.2"
},
{
"status": "affected",
"version": "17.6.3"
},
{
"status": "affected",
"version": "17.6.1y"
},
{
"status": "affected",
"version": "17.6.4"
},
{
"status": "affected",
"version": "17.6.5"
},
{
"status": "affected",
"version": "17.6.6"
},
{
"status": "affected",
"version": "17.6.6a"
},
{
"status": "affected",
"version": "17.6.5a"
},
{
"status": "affected",
"version": "17.6.7"
},
{
"status": "affected",
"version": "17.6.8"
},
{
"status": "affected",
"version": "17.7.1"
},
{
"status": "affected",
"version": "17.10.1"
},
{
"status": "affected",
"version": "17.10.1b"
},
{
"status": "affected",
"version": "17.8.1"
},
{
"status": "affected",
"version": "17.9.1"
},
{
"status": "affected",
"version": "17.9.2"
},
{
"status": "affected",
"version": "17.9.3"
},
{
"status": "affected",
"version": "17.9.4"
},
{
"status": "affected",
"version": "17.9.5"
},
{
"status": "affected",
"version": "17.9.4a"
},
{
"status": "affected",
"version": "17.9.6"
},
{
"status": "affected",
"version": "17.9.6a"
},
{
"status": "affected",
"version": "17.9.7"
},
{
"status": "affected",
"version": "17.9.8"
},
{
"status": "affected",
"version": "17.11.1"
},
{
"status": "affected",
"version": "17.12.1"
},
{
"status": "affected",
"version": "17.12.2"
},
{
"status": "affected",
"version": "17.12.3"
},
{
"status": "affected",
"version": "17.12.4"
},
{
"status": "affected",
"version": "17.12.5"
},
{
"status": "affected",
"version": "17.12.1z5"
},
{
"status": "affected",
"version": "17.13.1"
},
{
"status": "affected",
"version": "17.14.1"
},
{
"status": "affected",
"version": "17.15.1"
},
{
"status": "affected",
"version": "17.15.2"
},
{
"status": "affected",
"version": "17.15.3"
},
{
"status": "affected",
"version": "17.15.2b"
},
{
"status": "affected",
"version": "17.15.4"
},
{
"status": "affected",
"version": "17.15.4d"
},
{
"status": "affected",
"version": "17.16.1"
},
{
"status": "affected",
"version": "17.17.1"
},
{
"status": "affected",
"version": "17.18.1"
}
]
}
],
"source": "psirt@cisco.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.6.1:*:*:*:*:*:*:*",
"matchCriteriaId": "F821EBD7-91E2-4460-BFAF-18482CF6CB8C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.6.2:*:*:*:*:*:*:*",
"matchCriteriaId": "E36D2D24-8F63-46DE-AC5F-8DE33332EBC6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.6.3:*:*:*:*:*:*:*",
"matchCriteriaId": "C9B825E6-5929-4890-BDBA-4CF4BD2314C9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.6.4:*:*:*:*:*:*:*",
"matchCriteriaId": "65020120-491D-46CD-8C73-974B6F4C11E6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.6.4a:*:*:*:*:*:*:*",
"matchCriteriaId": "7ADDCD0A-6168-45A0-A885-76CC70FE2FC7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.6.5:*:*:*:*:*:*:*",
"matchCriteriaId": "D83E34F4-F4DD-49CC-9C95-93F9D4D26B42",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.6.6:*:*:*:*:*:*:*",
"matchCriteriaId": "8C8F50DB-3A80-4D89-9F7B-86766D37338B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.6.7:*:*:*:*:*:*:*",
"matchCriteriaId": "DBFC70A2-87BC-4898-BCF3-57F7B1DD5F10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.6.8:*:*:*:*:*:*:*",
"matchCriteriaId": "CB8DA556-ABF3-48D0-95B8-E57DBE1B5A09",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.6.9:*:*:*:*:*:*:*",
"matchCriteriaId": "01B53828-C520-4845-9C14-6C7D50EAA3A8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.6.10:*:*:*:*:*:*:*",
"matchCriteriaId": "20F23DB7-6F8E-470A-9B43-0ACEEF331C38",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.7.1:*:*:*:*:*:*:*",
"matchCriteriaId": "623BF701-ADC9-4F24-93C5-043A6A7FEF5F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.8.1:*:*:*:*:*:*:*",
"matchCriteriaId": "57D4F634-03D5-4D9F-901C-7E9CE45F2F38",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.8.1a:*:*:*:*:*:*:*",
"matchCriteriaId": "4463A1D1-E169-4F0B-91B2-FA126BB444CB",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.8.1s:*:*:*:*:*:*:*",
"matchCriteriaId": "5C9C585C-A6EC-4385-B915-046C110BF95F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.9.1:*:*:*:*:*:*:*",
"matchCriteriaId": "119A964D-ABC8-424D-8097-85B832A833BD",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.9.1s:*:*:*:*:*:*:*",
"matchCriteriaId": "78DE7780-4E8B-4BB6-BDEB-58032EC65851",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.9.2:*:*:*:*:*:*:*",
"matchCriteriaId": "F29CEE37-4044-4A3C-9685-C9C021FD346A",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.9.3:*:*:*:*:*:*:*",
"matchCriteriaId": "E1FDA817-3A50-4B9E-8F4E-F613BDB3E9EE",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.9.4:*:*:*:*:*:*:*",
"matchCriteriaId": "E4BF9829-F80E-4837-A420-39B291C4E17B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.9.5:*:*:*:*:*:*:*",
"matchCriteriaId": "F5AB80E7-0714-44ED-9671-12C877B36A1E",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.9.6:*:*:*:*:*:*:*",
"matchCriteriaId": "961F8312-31B9-44E7-8858-EF8E2134F447",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.9.7:*:*:*:*:*:*:*",
"matchCriteriaId": "3D62EE1B-9A59-406C-B7DF-91B495F3ECFE",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.9.8:*:*:*:*:*:*:*",
"matchCriteriaId": "79CF8D4E-F82A-469C-A8C2-0C203A800A05",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.10.1:*:*:*:*:*:*:*",
"matchCriteriaId": "DB6BD18B-B9BD-452F-986E-16A6668E46B6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.10.1e:*:*:*:*:*:*:*",
"matchCriteriaId": "ADED0D82-2A4D-4235-BFAC-5EE2D862B652",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.10.1s:*:*:*:*:*:*:*",
"matchCriteriaId": "763664F5-E6CD-4936-B2F8-C5E2D5EA7BB6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.11.1:*:*:*:*:*:*:*",
"matchCriteriaId": "E91F8704-6DAD-474A-84EA-04E4AF7BB9B1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.11.1b:*:*:*:*:*:*:*",
"matchCriteriaId": "5820D71D-FC93-45AA-BC58-A26A1A39C936",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.11.1s:*:*:*:*:*:*:*",
"matchCriteriaId": "DB26AE0F-85D8-4EAB-B9BD-457DD81FF0FE",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:*",
"matchCriteriaId": "C98DED36-D4B5-48D6-964E-EEEE97936700",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.1c:*:*:*:*:*:*:*",
"matchCriteriaId": "C8BEFEDA-B01A-480B-B03D-7ED5D08E4B67",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.1s:*:*:*:*:*:*:*",
"matchCriteriaId": "9027A528-2588-4C06-810B-5BB313FE4323",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.2:*:*:*:*:*:*:*",
"matchCriteriaId": "E5019B59-508E-40B0-9C92-2C26F58E2FBE",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.2s:*:*:*:*:*:*:*",
"matchCriteriaId": "1986DB1F-AD0A-42FE-8EC8-F18BA1AD4F99",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.3:*:*:*:*:*:*:*",
"matchCriteriaId": "D5750264-2990-4942-85F4-DB9746C5CA2B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.3a:*:*:*:*:*:*:*",
"matchCriteriaId": "02352FD8-2A7B-41BD-9E4A-F312ABFDF3EF",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.3s:*:*:*:*:*:*:*",
"matchCriteriaId": "B9173AD6-6658-4267-AAA7-D50D0B657528",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.4:*:*:*:*:*:*:*",
"matchCriteriaId": "7F02EE9D-45B1-43D6-B05D-6FF19472216B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.4a:*:*:*:*:*:*:*",
"matchCriteriaId": "1C1DBBCD-4C5A-43BB-8FB0-6F1AF99ED0D2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.5:*:*:*:*:*:*:*",
"matchCriteriaId": "8FCB9440-F470-45D1-AAFA-01FB5D76B600",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.5b:*:*:*:*:*:*:*",
"matchCriteriaId": "3BBFDD70-7AF3-47AE-94CA-56C19F2D6234",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.6:*:*:*:*:*:*:*",
"matchCriteriaId": "5B736F09-3B51-4B2A-92F6-602847001F15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.6a:*:*:*:*:*:*:*",
"matchCriteriaId": "2F58A94E-B050-4EFA-84BA-43B11BA22E77",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.7:*:*:*:*:*:*:*",
"matchCriteriaId": "5E864BB1-FD23-4AB3-9138-5FD8B62EAF5B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:16.12.8:*:*:*:*:*:*:*",
"matchCriteriaId": "838D6C2D-C131-4A9C-AAE5-5BF38E637E4B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.1.1:*:*:*:*:*:*:*",
"matchCriteriaId": "E306B09C-CB48-4067-B60C-5F738555EEAC",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.1.1s:*:*:*:*:*:*:*",
"matchCriteriaId": "4FF0DD16-D76A-45EA-B01A-20C71AEFA3B4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.1.1t:*:*:*:*:*:*:*",
"matchCriteriaId": "4BDD0CEC-4A19-438D-B2A1-8664A1D8F3C4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.1.3:*:*:*:*:*:*:*",
"matchCriteriaId": "8B4D4659-A304-459F-8AB3-ED6D84B44C0F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.2.1:*:*:*:*:*:*:*",
"matchCriteriaId": "4B7EE7C7-D6C1-4C35-8C80-EAF3FC7E7EFA",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.2.1a:*:*:*:*:*:*:*",
"matchCriteriaId": "B51FA707-8DB1-4596-9122-D4BFEF17F400",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.3.1:*:*:*:*:*:*:*",
"matchCriteriaId": "128F95D7-E49F-4B36-8F47-823C0298449E",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.3.2:*:*:*:*:*:*:*",
"matchCriteriaId": "2B270A04-9961-4E99-806B-441CD674AFBD",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.3.2a:*:*:*:*:*:*:*",
"matchCriteriaId": "1360069D-0358-4746-8C3F-44C2A40988D7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.3.3:*:*:*:*:*:*:*",
"matchCriteriaId": "C5DD2403-113B-4100-8BD4-90E1927E6648",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.3.4:*:*:*:*:*:*:*",
"matchCriteriaId": "DAF73937-BCE2-4BEF-B4B0-83212DA4A6C8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.3.5:*:*:*:*:*:*:*",
"matchCriteriaId": "6B2902D8-3A7B-4C47-9BC6-8CA4C580A346",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.3.6:*:*:*:*:*:*:*",
"matchCriteriaId": "917BA05C-2A18-4C68-B508-85C2B5A94416",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.3.7:*:*:*:*:*:*:*",
"matchCriteriaId": "06337791-7D8D-4EAA-BACC-4E270F377B3E",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.3.8:*:*:*:*:*:*:*",
"matchCriteriaId": "336A8630-653C-4E28-8DE1-76CDD8573980",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.3.8a:*:*:*:*:*:*:*",
"matchCriteriaId": "0A1767AE-7D9F-4BAA-90E1-CF8314CD0B53",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.4.1:*:*:*:*:*:*:*",
"matchCriteriaId": "5A6B707B-4543-41F1-83DF-49A93BF56FB1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.5.1:*:*:*:*:*:*:*",
"matchCriteriaId": "938B0720-8CA7-43BA-9708-5CE9EC7A565A",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.6.1:*:*:*:*:*:*:*",
"matchCriteriaId": "4DE62C4B-7C06-4907-BADE-416C1618D2D9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.6.1y:*:*:*:*:*:*:*",
"matchCriteriaId": "1B80614B-6362-45F0-B305-2F137B053DCF",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.6.2:*:*:*:*:*:*:*",
"matchCriteriaId": "04D19D8C-FACF-49B4-BA99-CC3A3FDADAFB",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.6.3:*:*:*:*:*:*:*",
"matchCriteriaId": "0B78942C-BEE1-4D18-9075-8E1D991BF621",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.6.4:*:*:*:*:*:*:*",
"matchCriteriaId": "9F21093D-1036-4F6B-B90F-ACE1EF99EA33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.6.5:*:*:*:*:*:*:*",
"matchCriteriaId": "280D24C6-A2BF-46E8-B512-6A3FA7833922",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.6.5a:*:*:*:*:*:*:*",
"matchCriteriaId": "1F903F51-ABF4-49B0-A5BA-A6B51F79666F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.6.6:*:*:*:*:*:*:*",
"matchCriteriaId": "E3F244E7-8EE9-4E58-83FA-EEDD3C8F792D",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.6.6a:*:*:*:*:*:*:*",
"matchCriteriaId": "5238B1D1-740D-4B37-A0CB-1B3343E55D05",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.6.7:*:*:*:*:*:*:*",
"matchCriteriaId": "27E0750C-A622-49D6-A8EF-B59E2F8F1912",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.6.8:*:*:*:*:*:*:*",
"matchCriteriaId": "2258D93E-71AA-4964-A5DF-008E3479F2A4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.7.1:*:*:*:*:*:*:*",
"matchCriteriaId": "38B87B17-C653-40AC-8AE4-066BB1123C88",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.8.1:*:*:*:*:*:*:*",
"matchCriteriaId": "7592C7E3-3735-425F-A276-9EE03224CD5E",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.9.1:*:*:*:*:*:*:*",
"matchCriteriaId": "5B0C2129-8149-4362-827C-A5494C9D398B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.9.2:*:*:*:*:*:*:*",
"matchCriteriaId": "D197445E-EC12-429C-BDD4-F63FA5C1B3E3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.9.3:*:*:*:*:*:*:*",
"matchCriteriaId": "51EA3EAA-A379-467E-AF9A-FCFBACAE49C7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.9.4:*:*:*:*:*:*:*",
"matchCriteriaId": "E67BE408-8DCF-491F-9EA9-E368565C1B49",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.9.4a:*:*:*:*:*:*:*",
"matchCriteriaId": "D9CFE98A-FBA5-4837-BBD9-3C875ECEBF1B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.9.5:*:*:*:*:*:*:*",
"matchCriteriaId": "36A5F20F-3F38-4FB9-B49D-28569EB1A763",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.9.6:*:*:*:*:*:*:*",
"matchCriteriaId": "7BDBE176-04ED-48F0-BA9F-45BECFEDBE2A",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.9.6a:*:*:*:*:*:*:*",
"matchCriteriaId": "94E52AA0-0A77-47DF-9600-7D5B8A6D09B6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.9.7:*:*:*:*:*:*:*",
"matchCriteriaId": "DB62FB56-A09A-4BE3-AF4C-180903078C69",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.9.8:*:*:*:*:*:*:*",
"matchCriteriaId": "BF6DD686-63EC-4D85-9B93-30FA04C7E9A1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.10.1:*:*:*:*:*:*:*",
"matchCriteriaId": "42FAEC29-D754-49D6-85F1-F5DDFAF6E80F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.10.1b:*:*:*:*:*:*:*",
"matchCriteriaId": "9A965A2A-129C-45C3-BCB1-2860F583D020",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.11.1:*:*:*:*:*:*:*",
"matchCriteriaId": "F313F2EC-F3D6-4639-934C-402DDA3DA806",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.12.1:*:*:*:*:*:*:*",
"matchCriteriaId": "1BF0778B-015D-481B-BAC0-40667F3453D3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.12.1z5:*:*:*:*:*:*:*",
"matchCriteriaId": "32C3EEA8-A8C8-4D0A-8861-4A6033D7FCED",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.12.2:*:*:*:*:*:*:*",
"matchCriteriaId": "EE165207-A066-44C1-B78A-6EFD80023204",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.12.3:*:*:*:*:*:*:*",
"matchCriteriaId": "1098FCEA-6A9F-4634-A0EF-EC55ABCCEA3E",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.12.4:*:*:*:*:*:*:*",
"matchCriteriaId": "6281EB0F-EE0E-4B06-A7A1-29460A98A8CA",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.12.5:*:*:*:*:*:*:*",
"matchCriteriaId": "99810E61-9C5F-4B26-8DFD-75C971593386",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.13.1:*:*:*:*:*:*:*",
"matchCriteriaId": "8577AF01-F2C7-48D3-AB0B-78BD63A60029",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.14.1:*:*:*:*:*:*:*",
"matchCriteriaId": "31789E98-7C8D-4C5A-8A3F-FC9AFE9A248C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.15.1:*:*:*:*:*:*:*",
"matchCriteriaId": "0174C08C-8846-45AE-83ED-E9964348FA28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.15.2:*:*:*:*:*:*:*",
"matchCriteriaId": "A18E50D1-BAF5-4C0F-9253-774089BAA2EE",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.15.2b:*:*:*:*:*:*:*",
"matchCriteriaId": "3E0FD5B7-69E7-43CB-A658-E05557AC2D77",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.15.3:*:*:*:*:*:*:*",
"matchCriteriaId": "2855BC9A-3F17-48FF-AE97-46ADB30AD0AD",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.15.4:*:*:*:*:*:*:*",
"matchCriteriaId": "8BAB6FF3-7978-47CA-BFBD-6211106C46BB",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.15.4d:*:*:*:*:*:*:*",
"matchCriteriaId": "6FC963E5-9505-4A3F-A232-C41D664BC322",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.16.1:*:*:*:*:*:*:*",
"matchCriteriaId": "88707E5B-2040-40AB-A8D2-39D6B97E40B1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.17.1:*:*:*:*:*:*:*",
"matchCriteriaId": "A9F98075-6210-4332-B76E-ECDFF1D55D33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:cisco:ios_xe:17.18.1:*:*:*:*:*:*:*",
"matchCriteriaId": "1A57F16D-2020-46F1-BA1A-DAE484F31920",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. \r\n\r This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. \r\n\r Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.\r\n\r There are workarounds that address this vulnerability."
},
{
"lang": "es",
"value": "Una vulnerabilidad en la caracter\u00edstica de DHCP snooping del software Cisco IOS XE podr\u00eda permitir a un atacante remoto no autenticado causar que los paquetes BOOTP sean reenviados entre VLANs, resultando en una condici\u00f3n de denegaci\u00f3n de servicio (DoS). Esta vulnerabilidad se debe a un manejo inadecuado de los paquetes BOOTP en los switches Cisco Catalyst de la serie 9000. Un atacante podr\u00eda explotar esta vulnerabilidad enviando paquetes de solicitud BOOTP a un dispositivo afectado. Un exploit exitoso podr\u00eda permitir a un atacante reenviar paquetes BOOTP de una VLAN a otra, resultando en una fuga de VLAN BOOTP y potencialmente llevando a una alta utilizaci\u00f3n de la CPU. Esto hace que el dispositivo sea inalcanzable (ya sea a trav\u00e9s de la consola o la gesti\u00f3n remota) e incapaz de reenviar tr\u00e1fico, resultando en una condici\u00f3n de DoS. Nota: Esta vulnerabilidad puede ser explotada con paquetes BOOTP unicast o broadcast. Existen soluciones alternativas que abordan esta vulnerabilidad."
}
],
"id": "CVE-2026-20084",
"lastModified": "2026-09-28T15:18:38.520",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 4.0,
"source": "psirt@cisco.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-20084",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-26T17:35:41.843290Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-03-25T16:16:13.563",
"references": [
{
"source": "psirt@cisco.com",
"tags": [
"Vendor Advisory"
],
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA"
}
],
"sourceIdentifier": "psirt@cisco.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
}
],
"source": "psirt@cisco.com",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2026-03-26T17:00:36+00:00",
"cve": "CVE-2026-20084",
"id": "CVE-2026-20084",
"initial_release_date": "2026-01-01T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "CVE-2026-20084",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-20084.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-20084",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-26T17:35:41.843290Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-03-26T17:35:45.608Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "Cisco IOS XE Software",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "16.6.1"
},
{
"status": "affected",
"version": "16.6.2"
},
{
"status": "affected",
"version": "16.6.3"
},
{
"status": "affected",
"version": "16.6.4"
},
{
"status": "affected",
"version": "16.6.5"
},
{
"status": "affected",
"version": "16.6.4a"
},
{
"status": "affected",
"version": "16.6.6"
},
{
"status": "affected",
"version": "16.6.7"
},
{
"status": "affected",
"version": "16.6.8"
},
{
"status": "affected",
"version": "16.6.9"
},
{
"status": "affected",
"version": "16.6.10"
},
{
"status": "affected",
"version": "16.7.1"
},
{
"status": "affected",
"version": "16.8.1"
},
{
"status": "affected",
"version": "16.8.1a"
},
{
"status": "affected",
"version": "16.8.1s"
},
{
"status": "affected",
"version": "16.9.1"
},
{
"status": "affected",
"version": "16.9.2"
},
{
"status": "affected",
"version": "16.9.1s"
},
{
"status": "affected",
"version": "16.9.3"
},
{
"status": "affected",
"version": "16.9.4"
},
{
"status": "affected",
"version": "16.9.5"
},
{
"status": "affected",
"version": "16.9.6"
},
{
"status": "affected",
"version": "16.9.7"
},
{
"status": "affected",
"version": "16.9.8"
},
{
"status": "affected",
"version": "16.10.1"
},
{
"status": "affected",
"version": "16.10.1s"
},
{
"status": "affected",
"version": "16.10.1e"
},
{
"status": "affected",
"version": "16.11.1"
},
{
"status": "affected",
"version": "16.11.1b"
},
{
"status": "affected",
"version": "16.11.1s"
},
{
"status": "affected",
"version": "16.12.1"
},
{
"status": "affected",
"version": "16.12.1s"
},
{
"status": "affected",
"version": "16.12.1c"
},
{
"status": "affected",
"version": "16.12.2"
},
{
"status": "affected",
"version": "16.12.3"
},
{
"status": "affected",
"version": "16.12.8"
},
{
"status": "affected",
"version": "16.12.2s"
},
{
"status": "affected",
"version": "16.12.4"
},
{
"status": "affected",
"version": "16.12.3s"
},
{
"status": "affected",
"version": "16.12.3a"
},
{
"status": "affected",
"version": "16.12.4a"
},
{
"status": "affected",
"version": "16.12.5"
},
{
"status": "affected",
"version": "16.12.6"
},
{
"status": "affected",
"version": "16.12.5b"
},
{
"status": "affected",
"version": "16.12.6a"
},
{
"status": "affected",
"version": "16.12.7"
},
{
"status": "affected",
"version": "17.1.1"
},
{
"status": "affected",
"version": "17.1.1s"
},
{
"status": "affected",
"version": "17.1.1t"
},
{
"status": "affected",
"version": "17.1.3"
},
{
"status": "affected",
"version": "17.2.1"
},
{
"status": "affected",
"version": "17.2.1a"
},
{
"status": "affected",
"version": "17.3.1"
},
{
"status": "affected",
"version": "17.3.2"
},
{
"status": "affected",
"version": "17.3.3"
},
{
"status": "affected",
"version": "17.3.2a"
},
{
"status": "affected",
"version": "17.3.4"
},
{
"status": "affected",
"version": "17.3.5"
},
{
"status": "affected",
"version": "17.3.6"
},
{
"status": "affected",
"version": "17.3.7"
},
{
"status": "affected",
"version": "17.3.8"
},
{
"status": "affected",
"version": "17.3.8a"
},
{
"status": "affected",
"version": "17.4.1"
},
{
"status": "affected",
"version": "17.5.1"
},
{
"status": "affected",
"version": "17.6.1"
},
{
"status": "affected",
"version": "17.6.2"
},
{
"status": "affected",
"version": "17.6.3"
},
{
"status": "affected",
"version": "17.6.1y"
},
{
"status": "affected",
"version": "17.6.4"
},
{
"status": "affected",
"version": "17.6.5"
},
{
"status": "affected",
"version": "17.6.6"
},
{
"status": "affected",
"version": "17.6.6a"
},
{
"status": "affected",
"version": "17.6.5a"
},
{
"status": "affected",
"version": "17.6.7"
},
{
"status": "affected",
"version": "17.6.8"
},
{
"status": "affected",
"version": "17.7.1"
},
{
"status": "affected",
"version": "17.10.1"
},
{
"status": "affected",
"version": "17.10.1b"
},
{
"status": "affected",
"version": "17.8.1"
},
{
"status": "affected",
"version": "17.9.1"
},
{
"status": "affected",
"version": "17.9.2"
},
{
"status": "affected",
"version": "17.9.3"
},
{
"status": "affected",
"version": "17.9.4"
},
{
"status": "affected",
"version": "17.9.5"
},
{
"status": "affected",
"version": "17.9.4a"
},
{
"status": "affected",
"version": "17.9.6"
},
{
"status": "affected",
"version": "17.9.6a"
},
{
"status": "affected",
"version": "17.9.7"
},
{
"status": "affected",
"version": "17.9.8"
},
{
"status": "affected",
"version": "17.11.1"
},
{
"status": "affected",
"version": "17.12.1"
},
{
"status": "affected",
"version": "17.12.2"
},
{
"status": "affected",
"version": "17.12.3"
},
{
"status": "affected",
"version": "17.12.4"
},
{
"status": "affected",
"version": "17.12.5"
},
{
"status": "affected",
"version": "17.12.1z5"
},
{
"status": "affected",
"version": "17.13.1"
},
{
"status": "affected",
"version": "17.14.1"
},
{
"status": "affected",
"version": "17.15.1"
},
{
"status": "affected",
"version": "17.15.2"
},
{
"status": "affected",
"version": "17.15.3"
},
{
"status": "affected",
"version": "17.15.2b"
},
{
"status": "affected",
"version": "17.15.4"
},
{
"status": "affected",
"version": "17.15.4d"
},
{
"status": "affected",
"version": "17.16.1"
},
{
"status": "affected",
"version": "17.17.1"
},
{
"status": "affected",
"version": "17.18.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. \r\n\r This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. \r\n\r Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.\r\n\r There are workarounds that address this vulnerability."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "Uncontrolled Resource Consumption",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-25T16:02:39.119Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-bootp-WuBhNBxA",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA"
}
],
"source": {
"advisory": "cisco-sa-bootp-WuBhNBxA",
"defects": [
"CSCwq07617"
],
"discovery": "EXTERNAL"
}
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20084",
"datePublished": "2026-03-25T16:02:39.119Z",
"dateReserved": "2025-10-08T11:59:15.366Z",
"dateUpdated": "2026-03-26T17:35:50.008Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…