by Kastro
Paper/Archive/CVE-2026-20043

CVE-2026-20043

Cisco Cisco Cyber Vision — Multiple Cisco Products Snort 3 Software Hardening Release: October 2026

EPSS 0.4%CVSS 9.0
critical.is priorityof 100
33
CVSS 9.0 (CNA)9.0 / 10 × 3027.0Not in CISA KEV+300.0EPSS percentile 30.2.302 × 206.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Cisco Cyber Vision3.0.0–CNA
Cisco Cyber Vision3.0.2–CNA
Cisco Cyber Vision3.0.3–CNA
Cisco Cyber Vision3.0.1–CNA
Cisco Cyber Vision3.1.0–CNA
Cisco Cyber Vision3.0.4–CNA
Cisco Cyber Vision3.1.1–CNA
Cisco Cyber Vision3.1.2–CNA
Cisco Cyber Vision3.2.0–CNA
Cisco Cyber Vision3.0.5–CNA
Cisco Cyber Vision3.2.1–CNA
Cisco Cyber Vision3.0.6–CNA

Scores by source

cisco (CNA)9.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refsec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-snort3-ybgmhTQe