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CVE-2009-2863

19
FAUCET Score

CVE-2009-2863 describes a race condition vulnerability in the Firewall Authentication Proxy feature of Cisco IOS versions 12.0 through 12.4. This flaw allows remote, unauthenticated attackers to bypass authentication or the consent web page through a specially crafted request. With a CVSS score of 7.1, this vulnerability is considered high severity due to its network attack vector, medium attack complexity, and high impact on confidentiality. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
12.0xkCPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.0xk:*:*:*:*:*:*:*
12.0xrCPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.0xr:*:*:*:*:*:*:*
12.1CPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.1:*:*:*:*:*:*:*
12.1eCPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.1e:*:*:*:*:*:*:*
12.1exCPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.1ex:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.1HIGH

AV:N/AC:M/Au:N/C:C/I:N/A:N

Confidentiality Impact
COMPLETE
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.47%
Probability of exploitation in next 30 days
EPSS Percentile
82.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0247 is in the 40th percentile among its peer group of 8,920 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

osvdb.org / 58340
exchange.xforce.ibmcloud.com / vulnerabilities/53453
tools.cisco.com / security/center/viewAlert.x
Vendor Advisory
cisco.com / en/US/products/products_security_advisory09186a0080af8132.shtml
Vendor Advisory
securityfocus.com / bid/36491
securitytracker.com / id