CVE-2009-2866

CVE-2009-2866 is a high-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

• Severity: High (CVSS 2.0 base score 7.8)
• EPSS exploit prediction: 3% (85th percentile)
• Actively exploited: Not listed in CISA KEV
• Affected product: Cisco Ios
• Published: 2009-09-28
• Last modified: 2026-06-16

Description

Unspecified vulnerability in Cisco IOS 12.2 through 12.4 allows remote attackers to cause a denial of service (device reload) via a crafted H.323 packet, aka Bug ID CSCsz38104.

Frequently asked questions

What is CVE-2009-2866?

Unspecified vulnerability in Cisco IOS 12.2 through 12.4 allows remote attackers to cause a denial of service (device reload) via a crafted H.323 packet, aka Bug ID CSCsz38104.

How severe is CVE-2009-2866?

CVE-2009-2866 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2009-2866 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2866?

CVE-2009-2866 primarily affects Cisco Ios. In total, 72 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-2866?

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-2009-2866 published?

CVE-2009-2866 was published on 2009-09-28 and last updated on 2026-06-16.

References

• http://osvdb.org/58337
• http://tools.cisco.com/security/center/viewAlert.x?alertId=18885
• http://www.cisco.com/en/US/products/products_security_advisory09186a0080af811a.shtml
• http://www.securityfocus.com/bid/36494
• http://www.securitytracker.com/id?1022930
• http://www.vupen.com/english/advisories/2009/2759
• https://exchange.xforce.ibmcloud.com/vulnerabilities/53446

Affected products (72)

• cpe:2.3:o:cisco:ios:12.2b:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2bx:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2cz:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2mc:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2t:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2yh:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2yj:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2yl:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ym:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2yn:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2yt:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2yu:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2yv:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2zc:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2zd:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2ze:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2zf:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2zh:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2zl:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.2zp:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3b:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3jk:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3t:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3va:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xa:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xb:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xc:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xd:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xe:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xf:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xg:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xj:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xk:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xl:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xq:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xr:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xu:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xw:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:ios:12.3xx:*:*:*:*:*:*:*

More vulnerabilities in Cisco Ios

• CVE-2011-3271 — Critical (CVSS 10.0): Unspecified vulnerability in the Smart Install functionality in Cisco IOS 12.2 and 15.1 allows remote attackers to…
• CVE-2011-0935 — Critical (CVSS 10.0): The PKI functionality in Cisco IOS 15.0 and 15.1 does not prevent permanent caching of certain public keys, which…
• CVE-2010-1574 — Critical (CVSS 10.0): IOS 12.2(52)SE and 12.2(52)SE1 on Cisco Industrial Ethernet (IE) 3000 series switches has (1) a community name of…
• CVE-2010-0581 — Critical (CVSS 10.0): Unspecified vulnerability in the SIP implementation in Cisco IOS 12.3 and 12.4 allows remote attackers to execute…
• CVE-2010-0580 — Critical (CVSS 10.0): Unspecified vulnerability in the SIP implementation in Cisco IOS 12.3 and 12.4 allows remote attackers to execute…
• CVE-2006-4950 — Critical (CVSS 10.0): Cisco IOS 12.2 through 12.4 before 20060920, as used by Cisco IAD2430, IAD2431, and IAD2432 Integrated Access Devices,…

All CVEs affecting Cisco Ios →