CVE-1999-1306

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 1992-12-10 · updated 2026-06-16

Description

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.

Affected products

Cisco IOS: through 9.1

References

http://www.cert.org/advisories/CA-1992-20.html
http://www.cert.org/advisories/CA-1992-20.html

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