{"id":"CVE-2026-20043","published":"2026-10-21T17:18:27.087","lastModified":"2026-10-26T10:10:00.140","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.\r\n\r\nThe 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.","cvssScore":9,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","cwes":["CWE-787"],"vendors":[],"products":[],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-snort3-ybgmhTQe","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"Out-of-bounds write vulnerability in Cisco Snort 3 allowing memory corruption during packet processing, potentially leading to system compromise.","exploitability":"Exploitation requires high skill and specific conditions due to the CVSS attack complexity of HIGH; no public exploit code is available.","blast_radius":"Successful exploitation could enable remote code execution, data exfiltration, or service disruption on affected Snort 3 deployments.","remediation":"Upgrade to Cisco Snort 3 version 2.590 or later, as this is the fixed version released in response to the internal security review.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["out-of-bounds-write","memory-corruption","ids","network-security"],"model":"garnet-coder","analyzedAt":"2026-10-27T08:50:56.982Z"}}