CVE-2005-2451

CVE-2005-2451 is a low-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 2.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

• Severity: Low (CVSS 2.0 base score 2.1)
• EPSS exploit prediction: 1% (69th percentile)
• Actively exploited: Not listed in CISA KEV
• Affected product: Cisco Ios
• Published: 2005-08-03
• Last modified: 2026-06-16

Description

Cisco IOS 12.0 through 12.4 and IOS XR before 3.2, with IPv6 enabled, allows remote attackers on a local network segment to cause a denial of service (device reload) and possibly execute arbitrary code via a crafted IPv6 packet.

Frequently asked questions

What is CVE-2005-2451?

Cisco IOS 12.0 through 12.4 and IOS XR before 3.2, with IPv6 enabled, allows remote attackers on a local network segment to cause a denial of service (device reload) and possibly execute arbitrary code via a crafted IPv6 packet.

How severe is CVE-2005-2451?

CVE-2005-2451 has a CVSS 2.0 base score of 2.1, rated low severity.

Is CVE-2005-2451 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2005-2451?

CVE-2005-2451 primarily affects Cisco Ios. In total, 148 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2005-2451?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2005-2451 published?

CVE-2005-2451 was published on 2005-08-03 and last updated on 2026-06-16.

References

• http://archives.neohapsis.com/archives/fulldisclosure/2005-07/0663.html
• http://secunia.com/advisories/16272
• http://securitytracker.com/id?1014598
• http://www.cisco.com/warp/public/707/cisco-sa-20050729-ipv6.shtml
• http://www.kb.cert.org/vuls/id/930892
• http://www.osvdb.org/18332
• http://www.securityfocus.com/bid/14414
• http://www.us-cert.gov/cas/techalerts/TA05-210A.html
• https://exchange.xforce.ibmcloud.com/vulnerabilities/21591
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5445

Affected products (148)

• cpe:2.3:o:cisco:ios:12.0s:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.0sl:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.0st:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.0sy:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1xu:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1xv:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1yb:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1yc:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1yd:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1ye:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1yf:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1yh:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.1yi:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2b:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2bc:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2bw:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2bx:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2by:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2bz:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2cx:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2cy:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2dd:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2dx:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2eu:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ew:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ewa:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ez:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ja:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2jk:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2mb:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2mc:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2mx:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2s:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2seb:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2sec:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2so:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2su:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2sv:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2sw:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2sx:*:*:*:*:*:*:*

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