CVE-2026-76466

criticalpriority · attend · 49OT risk · highEPSS 0.004 · 36 %ileexploit · PoCFRNLUS
grimoire priorityP1 · Urgent
Exploitable?
Public exploit
1 exploit · PoC
Likely / severe?
0.42% (36th) EPSS
CVSS 9.8 · critical
Is it mine?
95 products
Check your exposure
Who says so?
3 sources
cisco_csaf · ncsc_nl · certfr

EPSS · scored 2026-10-27

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.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

9.8
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · psirt@cisco.com USexploitability 3.9 · impact 5.9
v3.19.3criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · NCSC-NL NL
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · Cisco PSIRT US
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-798USCWE-798USCWE-798US
05

exploits (1)

Public proof-of-concept and weaponised exploit code.

06

affected products (95)

Products and version ranges known to be affected.

showing 20 of 95
07

advisories (3)

Vendor and ecosystem advisories describing this.

  • NCSC-2026-0451Kwetsbaarheden verholpen in Cisco Expressway SeriesNL2026-10-22csaf · ncsc_nlNL

    Cisco heeft meerdere kwetsbaarheden verholpen in Cisco Expressway Series.

  • cisco-sa-vcs-static-cred-hr7EWZ8tCisco Expressway Series Remote Code Execution Vulnerability2026-10-21csaf · cisco_csafUS

    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"].

  • CERTFR-2026-AVI-1360Multiples vulnérabilités dans les produits CiscoFrançais2026-10-22vendor · certfrFR
08

sources

Which sources assert this record, and when.

cisco_csafncsc_nlcertfrNVDCVE.orgMITRE
published 2026-10-21modified 2026-10-22
09

references (1) nvd

External citations — patches, advisories, analysis.

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