cisco-sa-vcs-static-cred-hr7EWZ8tCriticalCVSS 9.8

Cisco Expressway Series Remote Code Execution Vulnerability

Published
October 21, 2026
Last Modified
October 21, 2026

🔗 CVE IDs covered (1)

CVE-2026-76466 →

📋 Description

A vulnerability in the database service feature of Cisco Expressway Series could allow an unauthenticated, remote attacker with network access to a Cisco Expressway device to execute arbitrary operating system commands as root.

This vulnerability is due to the use of persistent cookies. Additionally, there is insufficient validation of client certificates when the TLS Verify Mode is set to Enabled for clustering, which means that client certificates are not validated. An attacker with possession of the cookies could exploit this vulnerability by connecting to the database service and invoking specific remote procedure call (RPC) commands. A successful exploit could allow the attacker to execute arbitrary commands as root on the underlying operating system of an affected device.

Note: Cisco Expressway Series refers to Cisco Expressway Core (Expressway-C) devices and Cisco Expressway Edge (Expressway-E) devices.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of October 21, 2026, Security Advisories ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-notice-QGwHnJ6k"]. In addition, for further documentation of improvements and fixes in Cisco Expressway Series see Cisco Expressway Series Security Hardening Release: October 2026 ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-exwy-hardening-FhcqBVcs"].

CVE-2026-76466 — Cisco Expressway Series Remote Code Execution Vulnerability (CVSS 3.1 9.8, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

🎯 Affected products93

  • Cisco TelePresence Video Communication Server (VCS) Expressway
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.0
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.1
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.2
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.3
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.4
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.5
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.6
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.7
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.8
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.5.9
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.0
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.1
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.2
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.3
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.6.4
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.7.0
  • Cisco TelePresence Video Communication Server (VCS) Expressway X12.7.1
  • Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.0
  • Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.1
  • Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.10
  • Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.11
  • Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.2
  • Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.3
  • Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.4
  • Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.5
  • Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.6
  • Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.7
  • Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.8
  • Cisco TelePresence Video Communication Server (VCS) Expressway X14.0.9
  • +63 more not shown

✅ Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com Workarounds: There are no workarounds that address this vulnerability.

🔗 References (4)