CVE-1999-1466: Vulnerability in Cisco routers versions 8.2 through 9.1 allows remote attackers to bypass access control lists when exte

Published n/a Updated 2026-08-21T04:30:36.306Z

Summary

Vulnerability in Cisco routers versions 8.2 through 9.1 allows remote attackers to bypass access control lists when extended IP access lists are used on certain interfaces, the IP route cache is enabled, and the access list uses the "established" keyword.

Severity

UNKNOWN

Source Attribution

Source: NVD · Updated: 2026-08-21T04:30:36.306Z · Confidence: high

Impact

Based on CVSS vector: n/a — assess confidentiality, integrity, and availability impact via the official vector documentation.

Affected Software

Fix

Upgrade affected software to the fixed version identified above. Apply vendor patches and monitor advisories before exposed systems go unpatched.

References