CVE-2026-76466: critical vulnerability in Cisco TelePresence Video Communication Server…
Cisco Expressway Series Remote Code Execution Vulnerability
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. It has an official Brazilian government alert.
ssvc Trackcvss 9.8epss 0.4%
from disclosure to weapon5 days
Published on NVDOct 21
1st PoC+5d
Official alert in Brazil
Brazil's federal government published an alert, recommendation or bulletin that cites this vulnerability.
- CISC Gov.br · 27 Oct 2026Boletim do CISC de Vulnerabilidadesread on gov.br ↗
Source: CTIR Gov (GSI) and CISC Gov.br, under the CC BY-ND 3.0 license.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
public PoCs found — 2
githubgithub.com/mehmet-emir-eroglu/CVE-2026-76466★ 0githubgithub.com/emirwtz/CVE-2026-76466★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Cisco TelePresence Video Communication Server…
In the same product, most dangerous first.
CVE-2023-20209MEDIUMCVE-2023-20209EPSS 39.5%CVE-2022-20755CRITICALCisco Expressway Series and Cisco TelePresence Video Communication Server VulnerabilitiesEPSS 3.3%CVE-2022-20754CRITICALCisco Expressway Series and Cisco TelePresence Video Communication Server VulnerabilitiesEPSS 3.3%CVE-2021-34716MEDIUMCisco Expressway Series and TelePresence Video Communication Server Remote Code Execution VulnerabilityEPSS 2.4%CVE-2022-20812CRITICALCisco Expressway Series and Cisco TelePresence Video Communication Server VulnerabilitiesEPSS 1.9%CVE-2020-3482MEDIUMCisco Expressway Software Unauthorized Access Information Disclosure VulnerabilityEPSS 1.4%