CVE-2026-20182 (GCVE-0-2026-20182)
Vulnerability from cvelistv5 – Published: 2026-05-14 16:08 – Updated: 2026-06-16 17:57Title
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
Summary
May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The section of this advisory includes Show Control Connections guidance to help with system checks.
A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system.
This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to the affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.
Severity
10 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-14 00:00 UTC
CWE
- CWE-287 - Improper Authentication
Assigner
References
3 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Cisco | Cisco Catalyst SD-WAN Controller |
Affected:
20.6.4
Affected: 20.9.2 Affected: 20.3.6 Affected: 20.7.2 Affected: 20.7.1 Affected: 20.5.1 Affected: 20.6.2 Affected: 19.3.0 Affected: 20.6.1 Affected: 17.2.4 Affected: 18.2.0 Affected: 18.4.6 Affected: 19.1.0 Affected: 19.2.4 Affected: 19.2.929 Affected: 18.3.8 Affected: 18.4.303 Affected: 18.3.7 Affected: 18.4.1 Affected: 19.2.097 Affected: 19.2.0 Affected: 19.2.099 Affected: 18.3.6 Affected: 20.4.2 Affected: 19.0.0 Affected: 20.9.1 Affected: 20.3.5 Affected: 20.3.1 Affected: 18.3.5 Affected: 20.6.3 Affected: 18.4.3 Affected: 18.4.4 Affected: 18.3.3 Affected: 17.2.8 Affected: 20.8.1 Affected: 19.2.32 Affected: 19.2.2 Affected: 17.2.5 Affected: 18.4.0 Affected: 20.4.1.1 Affected: 20.1.3 Affected: 20.1.2 Affected: 17.2.10 Affected: 19.2.098 Affected: 20.1.1 Affected: 17.2.6 Affected: 19.2.1 Affected: 18.3.4 Affected: 20.4.1 Affected: 17.2.9 Affected: 19.2.31 Affected: 19.0.1a Affected: 18.3.0 Affected: 17.2.7 Affected: 18.4.5 Affected: 20.3.4 Affected: 20.3.3 Affected: 20.4.1.2 Affected: 20.3.2 Affected: 18.3.1 Affected: 20.1.12 Affected: 19.2.3 Affected: 20.10.1 Affected: 20.6.5 Affected: 20.3.7 Affected: 20.9.3 Affected: 20.11.1 Affected: 20.6.3.2 Affected: 20.4.2.3 Affected: 20.3.5.1 Affected: 20.3.4.3 Affected: 20.9.3.1 Affected: 20.6.4.1 Affected: 20.3.3.2 Affected: 20.6.5.2 Affected: 20.3.7.1 Affected: 20.11.1.1 Affected: 20.10.1.1 Affected: 20.6.1.2 Affected: 20.1.3.1 Affected: 20.9.2.2 Affected: 20.6.5.3 Affected: 20.6.3.3 Affected: 20.3.7.2 Affected: 20.6.5.4 Affected: 20.9.2.3 Affected: 20.9.4 Affected: 20.12.1 Affected: 20.3.8 Affected: 20.6.6 Affected: 20.12.2 Affected: 20.13.1 Affected: 20.9.5 Affected: 20.12.3 Affected: 20.6.7 Affected: 20.9.5.1 Affected: 20.14.1 Affected: 20.12.3.1 Affected: 20.12.4 Affected: 20.15.1 Affected: 20.9.6 Affected: 20.6.8 Affected: 20.16.1 Affected: 20.9.5.3 Affected: 20.12.4.1 Affected: 20.15.2 Affected: 20.12.5 Affected: 20.9.7 Affected: 20.15.3 Affected: 20.12.5.1 Affected: 20.12.5.2 Affected: 20.15.4 Affected: 20.9.7.1 Affected: 20.12.6 Affected: 20.9.8 Affected: 20.15.4.1 Affected: 20.15.4.2 Affected: 20.12.5.3 Affected: 20.12.6.1 Affected: 20.9.8.2 Affected: 20.15.5 Affected: 20.12.7 Affected: 20.9.9 Affected: 20.15.5.1 Affected: 20.15.4.3 Affected: 20.15.4.5 Affected: 20.15.5.3 Affected: 20.12.7.2 Affected: 20.9.9.2 |
guessed | |
| Cisco | Cisco Catalyst SD-WAN Manager |
Affected:
20.1.12
Affected: 19.2.1 Affected: 18.4.4 Affected: 18.4.5 Affected: 20.1.1.1 Affected: 20.1.1 Affected: 19.2.099 Affected: 18.3.6 Affected: 18.3.7 Affected: 19.2.0 Affected: 19.1.0 Affected: 18.4.303 Affected: 19.2.098 Affected: 18.3.6.1 Affected: 18.2.0 Affected: 17.2.8 Affected: 18.3.3.1 Affected: 18.4.0 Affected: 18.3.1 Affected: 17.2.6 Affected: 17.2.9 Affected: 17.2.5 Affected: 18.4.0.1 Affected: 18.3.3 Affected: 18.3.0 Affected: 19.2.3 Affected: 18.4.501_ES Affected: 20.1.2 Affected: 19.2.929 Affected: 19.2.31 Affected: 20.3.2 Affected: 19.2.4 Affected: 19.2.4.0.9 Affected: 20.1.3.1 |
guessed |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: fe506d4d-dc99-4b51-94c8-4416d4b28d79
Exploited: Yes
Timestamps
First Seen: 2026-05-14
Asserted: 2026-05-14
Scope
Notes: KEV entry: Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability | Affected: Cisco / Catalyst SD-WAN | Description: Cisco Catalyst SD-WAN Controller & Manager contain an authentication bypass vulnerability that allows an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. | Required action: Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlined in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available. | Due date: 2026-05-17 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW ; https://nvd.nist.gov/vuln/detail/CVE-2026-20182
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-287 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Catalyst SD-WAN |
| Due Date | 2026-05-17 |
| Date Added | 2026-05-14 |
| Vendorproject | Cisco |
| Vulnerabilityname | Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-05-14 18:00 UTC
| Updated: 2026-05-14 18:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: bf8dcb2e-f9c5-43ff-a81c-f8d0a812563a
Exploited: Yes
Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability | Affected: Cisco / Cisco Catalyst SD-WAN Controller, Cisco Catalyst SD-WAN Manager | CVSS: 10.0 (CRITICAL) | EPSS: 0.76286 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability |
| Vendor | Cisco |
| Product | Cisco Catalyst SD-WAN Controller, Cisco Catalyst SD-WAN Manager |
| Added Date | 2026-06-01T10:28:27.362Z |
| Cvss Score | 10.0 |
| Epss Score | 0.76286 |
| Cvss Severity | CRITICAL |
| Epss Percentile | 0.99474 |
| Used In Malware | unknown |
| Ahead Of Cisa Kev |
|
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:03 UTC
| Updated: 2026-07-10 06:14 UTC
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"value": "May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The section of this advisory includes Show Control Connections guidance to help with system checks.\u0026nbsp;\r\n\r\nA vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system.\r\nThis vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to the affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric."
}
],
"exploits": [
{
"lang": "en",
"value": "In May 2026, the Cisco Product Security Incident Response Team (PSIRT) became aware of limited exploitation of this vulnerability. Cisco strongly recommends that customers upgrade to a fixed software release to remediate this vulnerability."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 10,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-287",
"description": "Improper Authentication",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-16T17:57:59.048Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-sdwan-rpa2-v69WY2SW",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW"
},
{
"name": "Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability\u003c/a\u003e was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The \u003ca href=\"#IOC\"\u003eIndicators of Compromise",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk"
}
],
"source": {
"advisory": "cisco-sa-sdwan-rpa2-v69WY2SW",
"defects": [
"CSCwt50498"
],
"discovery": "EXTERNAL"
},
"title": "Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20182",
"datePublished": "2026-05-14T16:08:25.566Z",
"dateReserved": "2025-10-08T11:59:15.393Z",
"dateUpdated": "2026-06-16T17:57:59.048Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"cisa_known_exploited": {
"cveID": "CVE-2026-20182",
"cwes": [
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],
"dateAdded": "2026-05-14",
"dueDate": "2026-05-17",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW ; https://nvd.nist.gov/vuln/detail/CVE-2026-20182",
"product": "Catalyst SD-WAN",
"requiredAction": "Please adhere to CISA\u2019s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlined in CISA\u2019s Emergency Directive 26-03 (URL listed below in Notes) and CISA\u2019s Hunt \u0026 Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.",
"shortDescription": "Cisco Catalyst SD-WAN Controller \u0026 Manager contain an authentication bypass vulnerability that allows an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system.",
"vendorProject": "Cisco",
"vulnerabilityName": "Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability"
},
"epss": {
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"date": "2026-09-20",
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},
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"source": "psirt@cisco.com"
}
],
"cisaActionDue": "2026-05-17",
"cisaExploitAdd": "2026-05-14",
"cisaRequiredAction": "Please adhere to CISA\u2019s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlined in CISA\u2019s Emergency Directive 26-03 (URL listed below in Notes) and CISA\u2019s Hunt \u0026 Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.",
"cisaVulnerabilityName": "Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability",
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}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20182",
"datePublished": "2026-05-14T16:08:25.566Z",
"dateReserved": "2025-10-08T11:59:15.393Z",
"dateUpdated": "2026-06-16T17:57:59.048Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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.
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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.
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