All vulnerabilities
CVE-2026-76466

Cisco Expressway Series Remote Code Execution Vulnerability

Cisco Cisco TelePresence Video Communication Server (VCS) ExpresswayNetwork & edge
Open in ThreatlineRecord JSON
CVSS
9.8Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.38%Chance of exploitation activity in the next 30 days, higher than 30% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published21 Oct 2026Updated 22 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Vendor and government advisories 1

Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

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.

Text from CVE List

Affected versions 30

  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.11.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.6CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.11.3CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.2.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.8.3CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.11.0CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X12.5.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.1.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.9CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X12.5.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X12.5.6CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.7.3CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X12.6.0CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.11.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.5CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.9.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.10.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.8.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.5.3CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.9.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.11.4CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X12.5.4CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.8.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.2.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.5.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.6.1CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.1.2CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.8CVE List
  • Cisco TelePresence Video Communication Server (VCS) Expresswayaffected: X8.10.0CVE List

References 1