CVE-1999-1306
Cisco IOS 9.1 and earlier does not properly handle extended IP access lists when the IP route...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-1999-1306- CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-1999-1306- Updated
- 2026-11-02
EUVDEUVD-1999-1287 No score
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.
- Record
EUVD-1999-1287- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-363m-9h8j-6gw4 No score
Cisco IOS 9.1 and earlier does not properly handle extended IP access lists when the IP route...
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.
- Record
GHSA-363m-9h8j-6gw4- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-1999-1306 is a high vulnerability (CVSS 7.5) in Cisco Ios, published December 10, 1992. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.39%, the 72nd percentile. No source names a fixed version.