Quick answers
- Is CVE-2026-76492 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-76492 being exploited in the wild.
- How severe is CVE-2026-76492?
- High severity, with a CVSS score of 7.5, published 21 October 2026.
- Which products and versions are affected?
- Cisco Expressway Core X14 and earlier, X15.5.3 and earlier; Cisco Expressway Edge X14 and earlier, X15.5.3 and earlier.
- Is there a fix for CVE-2026-76492?
- Yes: fixed in Expressway Core and Edge: X15.5.20; X14 requires migration to fixed release. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-76492 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-76492?
- Check whether you run Cisco Expressway Core or Cisco Expressway Edge 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 Core and Edge: X15.5.20; X14 requires migration to fixed release
Technical details
A null pointer dereference vulnerability (CWE-476) in Cisco Expressway Series can be triggered via network requests without authentication or user interaction. The attack has network-level access and results in application crash and denial of service. Cisco has released patched versions for both Expressway Core and Expressway Edge in both virtual and appliance deployments.
Affected products
- Cisco Expressway Core X14 and earlier, X15.5.3 and earlier
- Cisco Expressway Edge X14 and earlier, X15.5.3 and earlier
Timeline
- 2026-10-21: disclosed