EUVD Vulnerability Catalog

EUVD-2026-107372

Severity: CRITICAL Base Score: 9 CVSS Version: 3.1

Vulnerability 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.

CVSS Vector Analysis

Below is the complete, human-readable breakdown of the CVSS metric string: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

▪ Attack Vector (AV): Network

▪ Attack Complexity (AC): High

▪ Privileges Required (PR): None

▪ User Interaction (UI): None

▪ Scope (S): Changed

▪ Confidentiality Impact (C): High

▪ Integrity Impact (I): High

▪ Availability Impact (A): High

Affected Vendors & Systems

Vendor Cisco

References & Advisory Links

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-snort3-ybgmhTQe

Metadata Profile

Database Authority

European Union Agency for Cybersecurity (ENISA) EUVD

Assigner

cisco

EPSS Probability

Known Aliases

GHSA-jvf5-h9mp-fw5q CVE-2026-20043

Published On

2026-10-21

Last Updated

2026-10-22