CVE-2009-2855 json
The strListGetItem function in src/HttpHeaderTools.c in Squid 2.7 allows remote attackers to cause a denial of service via a crafted auth h…
published 2009-08-18 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-2845
- cvss
- 5.0
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 34.0%
- EPSS 34.0% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- squid Debian 14, Debian 13, Debian 12 2.7.STABLE7-1
debian advisories DEBIAN-CVE-2009-2855
- squid RHEL 5 7:2.6.STABLE21-6.el5
red hat advisories RHSA-2010:0221
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2009-2855 updated cvss 2.9
squid: DoS (100% CPU use) while processing certain external ACL helper HTTP headers
-
Red Hat Enterprise Linux (v. 5 server) squid 2.6.STABLE21-6.el5 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) squid 2.6.STABLE21-6.el5fixed: vendor fix RHSA-2010:0221
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
34.03% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
squid-cache.org
/bugs/show_bug.cgi?id=2704
vendor-advisory
-
openwall.com
/lists/oss-security/2009/08/03/3
mailing-list
-
securityfocus.com
/bid/36091
vdb-entry
- bugs.debian.org /cgi-bin/bugreport.cgi?bug=534982
-
openwall.com
/lists/oss-security/2009/08/04/6
mailing-list
- squid-cache.org /bugs/show_bug.cgi?id=2541
-
securitytracker.com
/id?1022757
vdb-entry
-
oval.cisecurity.org
/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10592
vdb-entry, signature
- bugzilla.redhat.com /show_bug.cgi?id=518182
-
openwall.com
/lists/oss-security/2009/07/20/10
mailing-list
-
exchange.xforce.ibmcloud.com
/vulnerabilities/52610
vdb-entry
- bugs.debian.org /cgi-bin/bugreport.cgi?msg=31%3Bfilename=diff%3Batt=1%3Bbug=534982
Sources
- CVE List CVE-2009-2855
- NVD CVE-2009-2855
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.