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CVE-2026-20127

CISA KEV
ACT NOW Priority: 0.00 BB Relevance: 10/100
Published: N/A Modified: N/A First seen: 2026-10-29 Status: pending_score

Description

Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, contain an authentication bypass vulnerability 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 an 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.

CISA Known Exploited Vulnerability

Vendor / Product Cisco — Catalyst SD-WAN Controller and Manager
Date Added 2026-02-25
Remediation Due 2026-02-27
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-rpa-EHchtZk ; https://nvd.nist.gov/vuln/detail/CVE-2026-20127

Bug Bounty Relevance

10 / 100
✓ Known exploited (KEV)
✓ High exploitation probability

CVSS Score

Unscored

EPSS — Exploitation Probability

89.29%
Raw Score 0.892940
Percentile 99.8%
Date 2026-10-28

Intelligence Sources

kev ref →

External Links