CVE-2012-2751

ModSecurity before 2.6.6, when used with PHP, does not properly handle single quotes not at the beginning of a request parameter value in the Content-Disposition field of a request with a multipart/form-data Content-Type header, which allows remote attackers to bypass filtering rules and perform other attacks such as cross-site scripting (XSS) attacks. NOTE: this vulnerability exists because of an incomplete fix for CVE-2009-5031.

Published: 2012-07-22 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-2751 is rated Moderate Risk (49/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 3.30%). EPSS rose +1.36% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2012-2751

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.94% 3.30% +1.36%
2 2025-10-13 1.76% 1.94% +0.18%
3 2025-07-08 — 1.76% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-2751

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2012-2751

OS Trackers for CVE-2012-2751

vendor priority summary link
debian not yet assigned CVE-2012-2751 not yet assigned priority: Debian including 1 source packages (modsecurity-apache), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2012-2751
suse medium — https://www.suse.com/security/cve/CVE-2012-2751/
ubuntu medium CVE-2012-2751 medium priority: Ubuntu including 2 source packages (libapache-mod-security, modsecurity-apache), 32 status rows across 16 suites (hardy, lucid, natty, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): DNE 15, not-affected 10, released 5, ignored 2. https://ubuntu.com/security/CVE-2012-2751

Affected software / configurations for CVE-2012-2751

Vendor Product Version Raw CPE
trustwave modsecurity < 2.6.6 cpe:2.3:a:trustwave:modsecurity:*:*:*:*:*:*:*:*
opensuse opensuse 11.4 cpe:2.3:o:opensuse:opensuse:11.4:*:*:*:*:*:*:*
opensuse opensuse 12.2 cpe:2.3:o:opensuse:opensuse:12.2:*:*:*:*:*:*:*
opensuse opensuse 12.3 cpe:2.3:o:opensuse:opensuse:12.3:*:*:*:*:*:*:*
debian debian_linux 6.0 cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
oracle http_server 11.1.1.6.0 cpe:2.3:a:oracle:http_server:11.1.1.6.0:*:*:*:*:*:*:*

References for CVE-2012-2751

URL Tags
http://blog.ivanristic.com/2012/06/modsecurity-and-modsecurity-core-rule-set-multipart-bypasses.html Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2013-08/msg00020.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2013-08/msg00025.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2013-08/msg00031.html Mailing List Third Party Advisory
http://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/branches/2.6.x/CHANGES Broken Link
http://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/trunk/CHANGES?r1=1920&r2=1919&pathrev=1920 Broken Link
http://mod-security.svn.sourceforge.net/viewvc/mod-security/m2/trunk/apache2/msc_multipart.c?r1=1918&r2=1917&pathrev=1918 Broken Link
http://secunia.com/advisories/49576 Third Party Advisory
http://secunia.com/advisories/49782 Third Party Advisory
http://www.debian.org/security/2012/dsa-2506 Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2012:118 Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2013:150 Third Party Advisory
http://www.openwall.com/lists/oss-security/2012/06/22/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2012/06/22/2 Mailing List Third Party Advisory
http://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html Third Party Advisory
http://www.securityfocus.com/bid/54156 Third Party Advisory VDB Entry
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