CVE-2009-2855

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 34.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2009-08-18 · updated 2026-06-16
Weakness: CWE-20

Description

The strListGetItem function in src/HttpHeaderTools.c in Squid 2.7 allows remote attackers to cause a denial of service via a crafted auth header with certain comma delimiters that trigger an infinite loop of calls to the strcspn function.

Affected products

Squid: 2.7, 2.7-stable3, 2.7-stable4

References

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534982
http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=31%3Bfilename=diff%3Batt=1%3Bbug=534982
http://www.openwall.com/lists/oss-security/2009/07/20/10
http://www.openwall.com/lists/oss-security/2009/08/03/3
http://www.openwall.com/lists/oss-security/2009/08/04/6
http://www.securityfocus.com/bid/36091
http://www.securitytracker.com/id?1022757
http://www.squid-cache.org/bugs/show_bug.cgi?id=2541
http://www.squid-cache.org/bugs/show_bug.cgi?id=2704
https://bugzilla.redhat.com/show_bug.cgi?id=518182
https://exchange.xforce.ibmcloud.com/vulnerabilities/52610
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10592

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