CVE-2026-20127

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.… Source description excerpt; complete tracked detail loads below.

NVD published: Feb 25, 2026 · Source record updated: Aug 8, 2026 · Tracker snapshot: Aug 8, 2026

Cisco — Catalyst SD-WAN Controller and Manager. Product-level identification only; no affected-version conclusion is available from this field.

NVD published: Feb 25, 2026 · Source record updated: Aug 8, 2026 · Tracker snapshot: Aug 8, 2026

Act · 470.4

Tracker decision tier from the evidence detailed below · Source record updated: Aug 8, 2026 · Tracker snapshot: Aug 8, 2026

kev-listed · CISA KEV · VulnCheck KEV · ENISA exploited-vulnerability catalog

Active since: Feb 25, 2026 · CISA KEV added: Feb 25, 2026 · VulnCheck KEV added: Feb 25, 2026 · ENISA added: Feb 25, 2026 · Source record updated: Aug 8, 2026 · Tracker snapshot: Aug 8, 2026

Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines 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.

Tracked source remediation field · Source record updated: Aug 8, 2026 · Tracker snapshot: Aug 8, 2026