Is CVE-2026-76493 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-76493 being exploited in the wild.

How severe is CVE-2026-76493?

High severity, with a CVSS score of 7.5, published 21 October 2026.

Which products and versions are affected?

Cisco Expressway-C X14 and earlier; Cisco Expressway-E X14 and earlier.

Is there a fix for CVE-2026-76493?

Yes: fixed in Expressway-C and Expressway-E: X15.5.20 (for X15.5.3 and earlier); X14 users must migrate to a fixed release. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-76493 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-76493?

Check whether you run Cisco Expressway-C or Cisco Expressway-E at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-76493: Cisco Expressway Series uncaught exceptions denial of service

CVE-2026-76493 · Severity: high · CVSS 7.5 · Published 2026-10-21

Cisco Expressway Series is a video communication platform used for routing and managing enterprise communication. Multiple uncaught exception vulnerabilities can cause the service to crash and become unavailable to users. An attacker on the network can trigger these exceptions without authentication, disrupting business communications.

Technologies: Cisco Expressway-C, Cisco Expressway-E. Vendors: Cisco.

Quick answers

Is CVE-2026-76493 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-76493 being exploited in the wild.
How severe is CVE-2026-76493?: High severity, with a CVSS score of 7.5, published 21 October 2026.
Which products and versions are affected?: Cisco Expressway-C X14 and earlier; Cisco Expressway-E X14 and earlier.
Is there a fix for CVE-2026-76493?: Yes: fixed in Expressway-C and Expressway-E: X15.5.20 (for X15.5.3 and earlier); X14 users must migrate to a fixed release. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-76493 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-76493?: Check whether you run Cisco Expressway-C or Cisco Expressway-E at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: Expressway-C and Expressway-E: X15.5.20 (for X15.5.3 and earlier); X14 users must migrate to a fixed release

Technical details

CWE-248 uncaught exceptions in Cisco Expressway-C and Expressway-E allow an unauthenticated network attacker to trigger exceptions that cause denial of service. The vulnerability is reachable remotely with no authentication or user interaction required. The attack results in service unavailability.

Affected products

Cisco Expressway-C X14 and earlier
Cisco Expressway-E X14 and earlier

Timeline

2026-10-21: disclosed

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-exwy-hardening-FhcqBVcs

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.