---
id: CVE-2026-76466
title: Cisco Expressway Series Remote Code Execution Vulnerability
summary: "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.\r\n\r\nT…"
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-798
vendor: Cisco
product: Cisco TelePresence Video Communication Server (VCS) Expressway
affected:
  - telepresence_video_communication_server_vcs_expressway X8.11.2
  - telepresence_video_communication_server_vcs_expressway X8.6
  - telepresence_video_communication_server_vcs_expressway X8.11.3
  - telepresence_video_communication_server_vcs_expressway X8.2.2
  - telepresence_video_communication_server_vcs_expressway X8.8.3
  - telepresence_video_communication_server_vcs_expressway X8.11.0
  - telepresence_video_communication_server_vcs_expressway X12.5.2
  - telepresence_video_communication_server_vcs_expressway X8.1.1
  - telepresence_video_communication_server_vcs_expressway X8.9
  - telepresence_video_communication_server_vcs_expressway X12.5.1
  - telepresence_video_communication_server_vcs_expressway X12.5.6
  - telepresence_video_communication_server_vcs_expressway X8.7.3
  - telepresence_video_communication_server_vcs_expressway X12.6.0
  - telepresence_video_communication_server_vcs_expressway X8.11.1
  - telepresence_video_communication_server_vcs_expressway X8.5
  - telepresence_video_communication_server_vcs_expressway X8.9.1
  - telepresence_video_communication_server_vcs_expressway X8.10.2
  - telepresence_video_communication_server_vcs_expressway X8.8.2
  - telepresence_video_communication_server_vcs_expressway X8.5.3
  - telepresence_video_communication_server_vcs_expressway X8.1
  - telepresence_video_communication_server_vcs_expressway X8.9.2
  - telepresence_video_communication_server_vcs_expressway X8.11.4
  - telepresence_video_communication_server_vcs_expressway X12.5.4
  - telepresence_video_communication_server_vcs_expressway X8.8.1
  - telepresence_video_communication_server_vcs_expressway X8.2.1
  - telepresence_video_communication_server_vcs_expressway X8.5.1
  - telepresence_video_communication_server_vcs_expressway X8.6.1
  - telepresence_video_communication_server_vcs_expressway X8.1.2
  - telepresence_video_communication_server_vcs_expressway X8.8
  - telepresence_video_communication_server_vcs_expressway X8.10.0
  - telepresence_video_communication_server_vcs_expressway X12.5.3
  - telepresence_video_communication_server_vcs_expressway X8.10.1
  - telepresence_video_communication_server_vcs_expressway X12.5.7
  - telepresence_video_communication_server_vcs_expressway X8.10.3
  - telepresence_video_communication_server_vcs_expressway X8.7.1
  - telepresence_video_communication_server_vcs_expressway X8.2
  - telepresence_video_communication_server_vcs_expressway X12.5.8
  - telepresence_video_communication_server_vcs_expressway X8.7
  - telepresence_video_communication_server_vcs_expressway X8.5.2
  - telepresence_video_communication_server_vcs_expressway X12.5.9
  - telepresence_video_communication_server_vcs_expressway X12.5.0
  - telepresence_video_communication_server_vcs_expressway X8.10.4
  - telepresence_video_communication_server_vcs_expressway X8.7.2
  - telepresence_video_communication_server_vcs_expressway X12.5.5
  - telepresence_video_communication_server_vcs_expressway X12.6.1
  - telepresence_video_communication_server_vcs_expressway X12.6.2
  - telepresence_video_communication_server_vcs_expressway X12.6.3
  - telepresence_video_communication_server_vcs_expressway X12.6.4
  - telepresence_video_communication_server_vcs_expressway X12.7.0
  - telepresence_video_communication_server_vcs_expressway X12.7.1
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-21T16:48:49.979581Z'
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T17:19:11.907Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-76466'
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vcs-static-cred-hr7EWZ8t
    label: cisco-sa-vcs-static-cred-hr7EWZ8t
tags:
  - cve.org
ingestedAt: '2026-10-21T17:07:51.304Z'
---

## Overview

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.

## Affected

- `telepresence_video_communication_server_vcs_expressway X8.11.2`
- `telepresence_video_communication_server_vcs_expressway X8.6`
- `telepresence_video_communication_server_vcs_expressway X8.11.3`
- `telepresence_video_communication_server_vcs_expressway X8.2.2`
- `telepresence_video_communication_server_vcs_expressway X8.8.3`
- `telepresence_video_communication_server_vcs_expressway X8.11.0`
- `telepresence_video_communication_server_vcs_expressway X12.5.2`
- `telepresence_video_communication_server_vcs_expressway X8.1.1`
- `telepresence_video_communication_server_vcs_expressway X8.9`
- `telepresence_video_communication_server_vcs_expressway X12.5.1`
- `telepresence_video_communication_server_vcs_expressway X12.5.6`
- `telepresence_video_communication_server_vcs_expressway X8.7.3`
- `telepresence_video_communication_server_vcs_expressway X12.6.0`
- `telepresence_video_communication_server_vcs_expressway X8.11.1`
- `telepresence_video_communication_server_vcs_expressway X8.5`
- `telepresence_video_communication_server_vcs_expressway X8.9.1`
- `telepresence_video_communication_server_vcs_expressway X8.10.2`
- `telepresence_video_communication_server_vcs_expressway X8.8.2`
- `telepresence_video_communication_server_vcs_expressway X8.5.3`
- `telepresence_video_communication_server_vcs_expressway X8.1`
- `telepresence_video_communication_server_vcs_expressway X8.9.2`
- `telepresence_video_communication_server_vcs_expressway X8.11.4`
- `telepresence_video_communication_server_vcs_expressway X12.5.4`
- `telepresence_video_communication_server_vcs_expressway X8.8.1`
- `telepresence_video_communication_server_vcs_expressway X8.2.1`
- `telepresence_video_communication_server_vcs_expressway X8.5.1`
- `telepresence_video_communication_server_vcs_expressway X8.6.1`
- `telepresence_video_communication_server_vcs_expressway X8.1.2`
- `telepresence_video_communication_server_vcs_expressway X8.8`
- `telepresence_video_communication_server_vcs_expressway X8.10.0`
- `telepresence_video_communication_server_vcs_expressway X12.5.3`
- `telepresence_video_communication_server_vcs_expressway X8.10.1`
- `telepresence_video_communication_server_vcs_expressway X12.5.7`
- `telepresence_video_communication_server_vcs_expressway X8.10.3`
- `telepresence_video_communication_server_vcs_expressway X8.7.1`
- `telepresence_video_communication_server_vcs_expressway X8.2`
- `telepresence_video_communication_server_vcs_expressway X12.5.8`
- `telepresence_video_communication_server_vcs_expressway X8.7`
- `telepresence_video_communication_server_vcs_expressway X8.5.2`
- `telepresence_video_communication_server_vcs_expressway X12.5.9`
- `telepresence_video_communication_server_vcs_expressway X12.5.0`
- `telepresence_video_communication_server_vcs_expressway X8.10.4`
- `telepresence_video_communication_server_vcs_expressway X8.7.2`
- `telepresence_video_communication_server_vcs_expressway X12.5.5`
- `telepresence_video_communication_server_vcs_expressway X12.6.1`
- `telepresence_video_communication_server_vcs_expressway X12.6.2`
- `telepresence_video_communication_server_vcs_expressway X12.6.3`
- `telepresence_video_communication_server_vcs_expressway X12.6.4`
- `telepresence_video_communication_server_vcs_expressway X12.7.0`
- `telepresence_video_communication_server_vcs_expressway X12.7.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.