Cyber Centre flags Cisco flaws in several products (AV26-1073)
Original title: Cisco security advisory (AV26-1073)
Named fixes include Expressway X15.5.20, Snort 3.12.4.0, Cyber Vision 5.6.0, and Secure Client 5.1.20.333.
On October 21, 2026, the Canadian Centre for Cyber Security issued AV26-1073, saying Cisco products are affected by vulnerabilities. Listed ranges include multiple IOS XR and Secure Firewall Threat Defense (FTD) versions, Expressway before X15.5.20, Snort 3 before 3.12.4.0, Cyber Vision before 5.6.0, Secure Client before 5.1.20.333, and several collaboration products before 15SU5. The centre tells users and administrators to review Cisco's advisories and apply updates as they become available.
Unconfirmed: The notice does not name CVE identifiers, severity, or whether any flaw is being exploited.
- Serial number AV26-1073 is dated October 21, 2026.
- IOS XR and Secure FTD are listed only as multiple versions.
- Expressway, Snort 3, Cyber Vision, and Secure Client have prior-to cutoffs.
- Emergency Responder, Prime Collaboration Deployment, Unified CM, IM&P, SME, and Unity Connection are prior to 15SU5.
| Product | Affected |
|---|---|
| Cisco IOS XR Software | Multiple versions |
| Cisco Expressway Series | Prior to X15.5.20 |
| Cisco Snort 3 | Prior to 3.12.4.0 |
| Cisco Cyber Vision | Prior to 5.6.0 |
| Cisco Secure Firewall Threat Defense (FTD) Software | Multiple versions |
| Cisco Secure Client | Prior to 5.1.20.333 |
| Cisco Emergency Responder, Prime Collaboration Deployment, Unified CM, Unified CM IM&P, Unified CM SME, and Unity Connection | Prior to 15SU5 |
- 1.Review the Cisco advisories linked by the Cyber Centre and apply available updates.
From the original article
1 min read at cyber.gc.ca
Serial number: AV26-1073 Date: October 21, 2026 As of October 21, 2026, Cisco is affected by vulnerabilities in the following products: Cisco IOS XR Software Release Multiple versions Cisco Expressway Series Release Prior to X15. 5. 20 Snort 3 Release Prior to 3.
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