CVE-2009-2863

CVE-2009-2863 is a high-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

• Severity: High (CVSS 2.0 base score 7.1)
• EPSS exploit prediction: 2% (83rd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-287
• Affected product: Cisco Ios
• Published: 2009-09-28
• Last modified: 2026-06-16

Description

Race condition in the Firewall Authentication Proxy feature in Cisco IOS 12.0 through 12.4 allows remote attackers to bypass authentication, or bypass the consent web page, via a crafted request, aka Bug ID CSCsy15227.

Frequently asked questions

What is CVE-2009-2863?

Race condition in the Firewall Authentication Proxy feature in Cisco IOS 12.0 through 12.4 allows remote attackers to bypass authentication, or bypass the consent web page, via a crafted request, aka Bug ID CSCsy15227.

How severe is CVE-2009-2863?

CVE-2009-2863 has a CVSS 2.0 base score of 7.1, rated high severity.

Is CVE-2009-2863 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2863?

CVE-2009-2863 primarily affects Cisco Ios. In total, 136 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-2863?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2009-2863 published?

CVE-2009-2863 was published on 2009-09-28 and last updated on 2026-06-16.

References

• http://osvdb.org/58340
• http://tools.cisco.com/security/center/viewAlert.x?alertId=18882
• http://www.cisco.com/en/US/products/products_security_advisory09186a0080af8132.shtml
• http://www.securityfocus.com/bid/36491
• http://www.securitytracker.com/id?1022935
• https://exchange.xforce.ibmcloud.com/vulnerabilities/53453

Affected products (136)

• cpe:2.3:o:cisco:ios:12.0xk:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.0xr:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1e:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1ex:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1t:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1xc:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1xh:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1xi:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1xj:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1xm:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1xp:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1xr:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1yb:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1yd:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1yf:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1yi:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2b:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2bw:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2cz:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2dd:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ex:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ey:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2fz:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ira:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2irb:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2irc:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ixa:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ixb:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ixc:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ixd:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ixe:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ixf:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ixg:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2s:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2sbc:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2se:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2sec:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2sed:*:*:*:*:*:*:*

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