Vulnerability in Cisco Cyber Vision

[ Why it matters ]Priority signals

• Critical severity: CVSS 9.0

[ Description ]Official description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20043 are related to issues concerning out-of-bounds writes that are grouped under the Common Weakness Enumeration (CWE) Base CWE-787.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• NCSC-NL22 Oct 2026NCSC-2026-0450

  Vulnerabilities fixed in Snort 3 from Cisco Translated from Dutch

  Probability/damage M/HCVE-2026-20011CVE-2026-20019CVE-2026-20043+10 more CVEs
• CERT-FR22 Oct 2026CERTFR-2026-AVI-1360

  Multiple vulnerabilities in Cisco products Translated from French

  Multiple vulnerabilities have been discovered in Cisco products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-20356CVE-2026-76481CVE-2026-76524+23 more CVEs
• BSI CERT-Bund21 Oct 2026WID-SEC-2026-4104

  Cisco products (IOS XE, SFTD) and Snort: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-20236CVE-2026-20011CVE-2026-20356+10 more CVEs

[ References ]References

• sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardenin…