CVE-2012-4623

Severity: high (CVSS 7.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2012-09-27 · updated 2026-06-16
Weakness: CWE-20

Description

The DHCPv6 server in Cisco IOS 12.2 through 12.4 and 15.0 through 15.2 and IOS XE 2.1.x through 2.6.x, 3.1.xS before 3.1.4S, 3.1.xSG and 3.2.xSG before 3.2.5SG, 3.2.xS, 3.2.xXO, 3.3.xS, and 3.3.xSG before 3.3.1SG allows remote attackers to cause a denial of service (device reload) via a malformed DHCPv6 packet, aka Bug ID CSCto57723.

Affected products

Cisco IOS: 12.3, 12.3(1a), 12.3(2)ja, 12.3(2)ja5, 12.3(2)jk, 12.3(2)jk1 (+287)
Cisco IOS XE: 2.1, 2.1.0, 2.1.1, 2.1.2, 2.2, 2.2.1 (+39)

References

http://osvdb.org/85810
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-dhcpv6
http://www.securityfocus.com/bid/55700
http://www.securitytracker.com/id?1027577
https://exchange.xforce.ibmcloud.com/vulnerabilities/78885
http://osvdb.org/85810
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-dhcpv6
http://www.securityfocus.com/bid/55700
http://www.securitytracker.com/id?1027577
https://exchange.xforce.ibmcloud.com/vulnerabilities/78885

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