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GHSA-RXC8-WWJF-P7FP
Vulnerability from github – Published: 2026-08-05 18:31 – Updated: 2026-08-05 18:31
VLAI
Details
A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition.
This vulnerability is due to improper error handling when parsing SNMP requests. This vulnerability affects all versions of SNMP — Versions 1, 2c, and 3. An attacker could exploit this vulnerability by sending a malformed SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly. The attacker must have the SNMPv1 or v2c read-only or read-write community string or valid SNMPv3 user credentials on the affected device.
Severity
7.7 (High)
{
"affected": [],
"aliases": [
"CVE-2026-20124"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-05T17:16:46Z",
"severity": "HIGH"
},
"details": "A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition.\n\nThis vulnerability is due to improper error handling when parsing SNMP requests. This vulnerability affects all versions of SNMP \u0026mdash; Versions 1, 2c, and 3. An attacker could exploit this vulnerability by sending a malformed SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly. The attacker must have the SNMPv1 or v2c read-only or read-write community string or valid SNMPv3 user credentials on the affected device.",
"id": "GHSA-rxc8-wwjf-p7fp",
"modified": "2026-08-05T18:31:38Z",
"published": "2026-08-05T18:31:38Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20124"
},
{
"type": "WEB",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-snmp-dos-ZAqNm4MD"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
CVE-2026-20124 (GCVE-0-2026-20124)
Vulnerability from cvelistv5 – Published: 2026-08-05 16:18 – Updated: 2026-08-05 17:20
VLAI
EPSS
VEX
Title
Cisco IOS XE Software SNMP Denial of Service Vulnerability
Summary
A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition.
This vulnerability is due to improper error handling when parsing SNMP requests. This vulnerability affects all versions of SNMP — Versions 1, 2c, and 3. An attacker could exploit this vulnerability by sending a malformed SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly. The attacker must have the SNMPv1 or v2c read-only or read-write community string or valid SNMPv3 user credentials on the affected device.
Severity
7.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-772 - Missing Release of Resource after Effective Lifetime
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco IOS XE Software |
Affected:
17.2.1a
Affected: 3.18.7SP Affected: 16.12.1y Affected: 16.12.3s Affected: 16.7.1b Affected: 16.6.2 Affected: 16.6.5 Affected: 16.12.1w Affected: 3.18.4S Affected: 16.9.1d Affected: 17.3.1 Affected: 16.9.4c Affected: 16.7.1 Affected: 17.2.1 Affected: 16.6.8 Affected: 16.9.1b Affected: 3.16.8S Affected: 16.9.2s Affected: 16.12.4 Affected: 16.12.3a Affected: 17.1.1s Affected: 16.11.1a Affected: 16.7.2 Affected: 16.11.1b Affected: 16.9.1s Affected: 16.9.3h Affected: 16.9.1c Affected: 16.6.5a Affected: 16.6.3 Affected: 16.10.1f Affected: 17.2.1v Affected: 16.8.1e Affected: 16.9.3a Affected: 16.12.1a Affected: 16.12.1x Affected: 3.16.10aS Affected: 16.6.4s Affected: 16.10.1c Affected: 16.12.3 Affected: 16.11.2 Affected: 16.6.5b Affected: 16.12.2s Affected: 16.10.1b Affected: 16.7.3 Affected: 16.6.7 Affected: 16.9.6 Affected: 16.9.2 Affected: 3.16.10S Affected: 16.10.1 Affected: 16.12.1t Affected: 3.18.3bSP Affected: 3.13.9S Affected: 3.18.3aSP Affected: 3.18.5SP Affected: 16.9.1 Affected: 16.8.1a Affected: 3.18.8aSP Affected: 16.9.3s Affected: 16.6.7a Affected: 16.12.2 Affected: 16.11.1 Affected: 16.9.3 Affected: 16.11.1s Affected: 16.12.1 Affected: 3.16.9S Affected: 17.1.1 Affected: 17.1.2 Affected: 16.10.1d Affected: 17.1.1t Affected: 16.9.4 Affected: 16.8.3 Affected: 16.12.2t Affected: 16.9.5 Affected: 3.16.7S Affected: 16.8.1s Affected: 16.10.1e Affected: 16.8.2 Affected: 16.6.4 Affected: 16.8.1b Affected: 16.10.1a Affected: 16.12.1z Affected: 16.8.1c Affected: 16.9.1a Affected: 3.16.7aS Affected: 16.9.5f Affected: 16.6.4a Affected: 16.10.1g Affected: 3.13.10S Affected: 16.8.1 Affected: 16.6.6 Affected: 16.9.2a Affected: 16.8.1d Affected: 16.10.3 Affected: 3.18.4SP Affected: 3.18.6SP Affected: 3.18.3SP Affected: 16.7.1a Affected: 16.11.1c Affected: 16.10.1s Affected: 17.2.1r Affected: 3.16.7bS Affected: 17.1.1a Affected: 16.10.2 Affected: 16.12.2a Affected: 3.16.6bS Affected: 16.12.1c Affected: 16.12.1s Affected: 16.7.4 Affected: 3.18.9SP Affected: 17.2.2 Affected: 16.9.8 Affected: 16.9.7 Affected: 17.1.3 Affected: 17.3.1a Affected: 17.3.2a Affected: 16.12.5 Affected: 17.3.1w Affected: 17.3.2 Affected: 17.4.1 Affected: 16.12.4a Affected: 17.4.1a Affected: 3.16.10bS Affected: 17.3.1x Affected: 17.3.3 Affected: 16.6.9 Affected: 17.2.3 Affected: 17.5.1 Affected: 16.12.1z1 Affected: 16.12.5a Affected: 17.4.1b Affected: 17.3.1z Affected: 16.12.5b Affected: 17.4.2 Affected: 17.3.3a Affected: 17.3.5 Affected: 17.3.4 Affected: 17.5.1a Affected: 16.12.6 Affected: 17.6.1 Affected: 16.12.1z2 Affected: 16.6.10 Affected: 17.3.4a Affected: 17.6.1a Affected: 17.7.1 Affected: 17.6.1x Affected: 17.6.2 Affected: 16.12.6a Affected: 17.3.4c Affected: 17.4.2a Affected: 17.3.4b Affected: 17.7.1a Affected: 16.12.7 Affected: 17.8.1a Affected: 17.6.3a Affected: 17.6.3 Affected: 17.7.2 Affected: 17.7.1b Affected: 17.9.1w Affected: 17.3.5a Affected: 17.6.1z Affected: 16.12.8 Affected: 17.8.1 Affected: 17.9.1 Affected: 17.6.4 Affected: 17.3.5b Affected: 17.9.1a Affected: 17.3.6 Affected: 17.10.1 Affected: 16.9.8a Affected: 17.6.1z1 Affected: 17.10.1a Affected: 17.9.2 Affected: 17.6.5 Affected: 17.9.1x Affected: 17.9.1y Affected: 16.9.8b Affected: 17.3.7 Affected: 17.9.2a Affected: 17.9.3 Affected: 16.12.9 Affected: 17.11.1 Affected: 17.10.1b Affected: 17.6.6 Affected: 17.9.1x1 Affected: 17.11.1a Affected: 17.9.3a Affected: 17.12.1 Affected: 17.3.8 Affected: 17.9.4 Affected: 16.12.10 Affected: 17.12.1w Affected: 17.9.1y1 Affected: 17.12.1a Affected: 17.9.5 Affected: 17.13.1 Affected: 17.12.1x Affected: 17.12.2 Affected: 17.14.1 Affected: 17.9.4a Affected: 17.3.8a Affected: 17.6.6a Affected: 17.6.5a Affected: 17.6.7 Affected: 16.12.10a Affected: 17.15.1 Affected: 17.13.1a Affected: 17.12.2a Affected: 16.12.11 Affected: 17.12.3 Affected: 17.12.1y Affected: 17.12.1z Affected: 17.9.5a Affected: 17.14.1a Affected: 17.9.5b Affected: 17.6.8 Affected: 16.12.12 Affected: 17.12.4 Affected: 17.9.6 Affected: 17.17.1 Affected: 17.16.1 Affected: 17.15.1w Affected: 17.12.3a Affected: 17.9.5c Affected: 17.15.1a Affected: 17.12.1z1 Affected: 17.15.2 Affected: 17.15.1b Affected: 17.9.5d Affected: 17.15.1x Affected: 17.9.6a Affected: 17.12.1z2 Affected: 17.6.8a Affected: 17.16.1a Affected: 16.12.13 Affected: 17.15.3 Affected: 17.9.7 Affected: 17.12.5 Affected: 17.15.1y Affected: 17.9.5e Affected: 17.12.4a Affected: 17.15.2a Affected: 17.15.2c Affected: 17.15.2b Affected: 17.12.1z3 Affected: 17.9.5f Affected: 17.12.4b Affected: 17.12.5a Affected: 17.18.1 Affected: 17.12.6 Affected: 17.12.1z4 Affected: 17.9.8 Affected: 17.9.7a Affected: 17.15.3a Affected: 17.15.4 Affected: 17.12.5b Affected: 17.15.3b Affected: 16.12.14 Affected: 17.9.7b Affected: 17.12.5c Affected: 17.18.1a Affected: 17.15.4a Affected: 17.18.2 Affected: 17.18.1w Affected: 17.15.4b Affected: 17.12.6a Affected: 17.15.4c Affected: 17.9.9 Affected: 17.12.5d Affected: 16.12.15 Affected: 17.15.4s1 Affected: 17.12.1z5 Affected: 17.18.1x Affected: 17.12.1z6 Affected: 17.15.4d Affected: 17.12.6b Affected: 17.4.1c Affected: 17.18.1y |
{
"containers": {
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{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-20124",
"options": [
{
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{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-05T17:20:40.573517Z",
"version": "2.0.3"
},
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}
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],
"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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},
"title": "CISA ADP Vulnrichment"
}
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"cna": {
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{
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{
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"version": "17.8.1a"
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{
"status": "affected",
"version": "17.6.3a"
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{
"status": "affected",
"version": "17.6.3"
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{
"status": "affected",
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{
"status": "affected",
"version": "17.7.1b"
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{
"status": "affected",
"version": "17.9.1w"
},
{
"status": "affected",
"version": "17.3.5a"
},
{
"status": "affected",
"version": "17.6.1z"
},
{
"status": "affected",
"version": "16.12.8"
},
{
"status": "affected",
"version": "17.8.1"
},
{
"status": "affected",
"version": "17.9.1"
},
{
"status": "affected",
"version": "17.6.4"
},
{
"status": "affected",
"version": "17.3.5b"
},
{
"status": "affected",
"version": "17.9.1a"
},
{
"status": "affected",
"version": "17.3.6"
},
{
"status": "affected",
"version": "17.10.1"
},
{
"status": "affected",
"version": "16.9.8a"
},
{
"status": "affected",
"version": "17.6.1z1"
},
{
"status": "affected",
"version": "17.10.1a"
},
{
"status": "affected",
"version": "17.9.2"
},
{
"status": "affected",
"version": "17.6.5"
},
{
"status": "affected",
"version": "17.9.1x"
},
{
"status": "affected",
"version": "17.9.1y"
},
{
"status": "affected",
"version": "16.9.8b"
},
{
"status": "affected",
"version": "17.3.7"
},
{
"status": "affected",
"version": "17.9.2a"
},
{
"status": "affected",
"version": "17.9.3"
},
{
"status": "affected",
"version": "16.12.9"
},
{
"status": "affected",
"version": "17.11.1"
},
{
"status": "affected",
"version": "17.10.1b"
},
{
"status": "affected",
"version": "17.6.6"
},
{
"status": "affected",
"version": "17.9.1x1"
},
{
"status": "affected",
"version": "17.11.1a"
},
{
"status": "affected",
"version": "17.9.3a"
},
{
"status": "affected",
"version": "17.12.1"
},
{
"status": "affected",
"version": "17.3.8"
},
{
"status": "affected",
"version": "17.9.4"
},
{
"status": "affected",
"version": "16.12.10"
},
{
"status": "affected",
"version": "17.12.1w"
},
{
"status": "affected",
"version": "17.9.1y1"
},
{
"status": "affected",
"version": "17.12.1a"
},
{
"status": "affected",
"version": "17.9.5"
},
{
"status": "affected",
"version": "17.13.1"
},
{
"status": "affected",
"version": "17.12.1x"
},
{
"status": "affected",
"version": "17.12.2"
},
{
"status": "affected",
"version": "17.14.1"
},
{
"status": "affected",
"version": "17.9.4a"
},
{
"status": "affected",
"version": "17.3.8a"
},
{
"status": "affected",
"version": "17.6.6a"
},
{
"status": "affected",
"version": "17.6.5a"
},
{
"status": "affected",
"version": "17.6.7"
},
{
"status": "affected",
"version": "16.12.10a"
},
{
"status": "affected",
"version": "17.15.1"
},
{
"status": "affected",
"version": "17.13.1a"
},
{
"status": "affected",
"version": "17.12.2a"
},
{
"status": "affected",
"version": "16.12.11"
},
{
"status": "affected",
"version": "17.12.3"
},
{
"status": "affected",
"version": "17.12.1y"
},
{
"status": "affected",
"version": "17.12.1z"
},
{
"status": "affected",
"version": "17.9.5a"
},
{
"status": "affected",
"version": "17.14.1a"
},
{
"status": "affected",
"version": "17.9.5b"
},
{
"status": "affected",
"version": "17.6.8"
},
{
"status": "affected",
"version": "16.12.12"
},
{
"status": "affected",
"version": "17.12.4"
},
{
"status": "affected",
"version": "17.9.6"
},
{
"status": "affected",
"version": "17.17.1"
},
{
"status": "affected",
"version": "17.16.1"
},
{
"status": "affected",
"version": "17.15.1w"
},
{
"status": "affected",
"version": "17.12.3a"
},
{
"status": "affected",
"version": "17.9.5c"
},
{
"status": "affected",
"version": "17.15.1a"
},
{
"status": "affected",
"version": "17.12.1z1"
},
{
"status": "affected",
"version": "17.15.2"
},
{
"status": "affected",
"version": "17.15.1b"
},
{
"status": "affected",
"version": "17.9.5d"
},
{
"status": "affected",
"version": "17.15.1x"
},
{
"status": "affected",
"version": "17.9.6a"
},
{
"status": "affected",
"version": "17.12.1z2"
},
{
"status": "affected",
"version": "17.6.8a"
},
{
"status": "affected",
"version": "17.16.1a"
},
{
"status": "affected",
"version": "16.12.13"
},
{
"status": "affected",
"version": "17.15.3"
},
{
"status": "affected",
"version": "17.9.7"
},
{
"status": "affected",
"version": "17.12.5"
},
{
"status": "affected",
"version": "17.15.1y"
},
{
"status": "affected",
"version": "17.9.5e"
},
{
"status": "affected",
"version": "17.12.4a"
},
{
"status": "affected",
"version": "17.15.2a"
},
{
"status": "affected",
"version": "17.15.2c"
},
{
"status": "affected",
"version": "17.15.2b"
},
{
"status": "affected",
"version": "17.12.1z3"
},
{
"status": "affected",
"version": "17.9.5f"
},
{
"status": "affected",
"version": "17.12.4b"
},
{
"status": "affected",
"version": "17.12.5a"
},
{
"status": "affected",
"version": "17.18.1"
},
{
"status": "affected",
"version": "17.12.6"
},
{
"status": "affected",
"version": "17.12.1z4"
},
{
"status": "affected",
"version": "17.9.8"
},
{
"status": "affected",
"version": "17.9.7a"
},
{
"status": "affected",
"version": "17.15.3a"
},
{
"status": "affected",
"version": "17.15.4"
},
{
"status": "affected",
"version": "17.12.5b"
},
{
"status": "affected",
"version": "17.15.3b"
},
{
"status": "affected",
"version": "16.12.14"
},
{
"status": "affected",
"version": "17.9.7b"
},
{
"status": "affected",
"version": "17.12.5c"
},
{
"status": "affected",
"version": "17.18.1a"
},
{
"status": "affected",
"version": "17.15.4a"
},
{
"status": "affected",
"version": "17.18.2"
},
{
"status": "affected",
"version": "17.18.1w"
},
{
"status": "affected",
"version": "17.15.4b"
},
{
"status": "affected",
"version": "17.12.6a"
},
{
"status": "affected",
"version": "17.15.4c"
},
{
"status": "affected",
"version": "17.9.9"
},
{
"status": "affected",
"version": "17.12.5d"
},
{
"status": "affected",
"version": "16.12.15"
},
{
"status": "affected",
"version": "17.15.4s1"
},
{
"status": "affected",
"version": "17.12.1z5"
},
{
"status": "affected",
"version": "17.18.1x"
},
{
"status": "affected",
"version": "17.12.1z6"
},
{
"status": "affected",
"version": "17.15.4d"
},
{
"status": "affected",
"version": "17.12.6b"
},
{
"status": "affected",
"version": "17.4.1c"
},
{
"status": "affected",
"version": "17.18.1y"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper error handling when parsing SNMP requests. This vulnerability affects all versions of SNMP \u0026mdash; Versions 1, 2c, and 3. An attacker could exploit this vulnerability by sending a malformed SNMP request to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly. The attacker must have the SNMPv1 or v2c read-only or read-write community string or valid SNMPv3 user credentials on the affected device."
}
],
"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": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-772",
"description": "Missing Release of Resource after Effective Lifetime",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T16:18:21.590Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-iosxe-snmp-dos-ZAqNm4MD",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-snmp-dos-ZAqNm4MD"
}
],
"source": {
"advisory": "cisco-sa-iosxe-snmp-dos-ZAqNm4MD",
"defects": [
"CSCws90638"
],
"discovery": "EXTERNAL"
},
"title": "Cisco IOS XE Software SNMP Denial of Service Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20124",
"datePublished": "2026-08-05T16:18:21.590Z",
"dateReserved": "2025-10-08T11:59:15.378Z",
"dateUpdated": "2026-08-05T17:20:47.421Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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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.
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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.
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