CVE-1999-1306

High CVSS 7.5

Published 1992-12-10 · last changed 2026-06-16

The fix

We hold no Microsoft remediation data for CVE-1999-1306, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

Cisco IOS 9.1 and earlier does not properly handle extended IP access lists when the IP route cache is enabled and the "established" keyword is set, which could allow attackers to bypass filters.

Sources

NVD record for CVE-1999-1306

CVSS vector: AV:N/AC:L/Au:N/C:P/I:P/A:P