CVE-2012-6109

lib/rack/multipart.rb in Rack before 1.1.4, 1.2.x before 1.2.6, 1.3.x before 1.3.7, and 1.4.x before 1.4.2 uses an incorrect regular expression, which allows remote attackers to cause a denial of service (infinite loop) via a crafted Content-Disposion header.

Published: 2013-03-01 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-6109 is rated Moderate Risk (48.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.72%). EPSS rose +1.89% 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-2012-6109

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 0.83% 2.72% +1.89%
2 2025-06-05 0.91% 0.83% -0.08%
3 2025-03-30 — 0.91% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-6109

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:N/A:P 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:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2012-6109

GitHub Security Advisory for CVE-2012-6109

OS Trackers for CVE-2012-6109

vendor priority summary link
debian not yet assigned CVE-2012-6109 not yet assigned priority: Debian including 1 source packages (ruby-rack), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2012-6109
gentoo high CVE-2012-6109: 1 GLSA(s) (201405-10), 1 atom(s) (dev-ruby/rack); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2012-6109
redhat medium — https://access.redhat.com/security/cve/CVE-2012-6109
ubuntu low CVE-2012-6109 low priority: Ubuntu including 1 source packages (ruby-rack), 15 status rows across 15 suites (hardy, lucid, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): released 9, DNE 3, ignored 3. https://ubuntu.com/security/CVE-2012-6109

Affected software / configurations for CVE-2012-6109

Vendor Product Version Raw CPE
rack_project rack <= 1.1.3 cpe:2.3:a:rack_project:rack:*:*:*:*:*:*:*:*
rack_project rack 0.1 cpe:2.3:a:rack_project:rack:0.1:*:*:*:*:*:*:*
rack_project rack 0.2 cpe:2.3:a:rack_project:rack:0.2:*:*:*:*:*:*:*
rack_project rack 0.3 cpe:2.3:a:rack_project:rack:0.3:*:*:*:*:*:*:*
rack_project rack 0.4 cpe:2.3:a:rack_project:rack:0.4:*:*:*:*:*:*:*
rack_project rack 0.9 cpe:2.3:a:rack_project:rack:0.9:*:*:*:*:*:*:*
rack_project rack 0.9.1 cpe:2.3:a:rack_project:rack:0.9.1:*:*:*:*:*:*:*
rack_project rack 1.0.0 cpe:2.3:a:rack_project:rack:1.0.0:*:*:*:*:*:*:*
rack_project rack 1.0.1 cpe:2.3:a:rack_project:rack:1.0.1:*:*:*:*:*:*:*
rack_project rack 1.1.0 cpe:2.3:a:rack_project:rack:1.1.0:*:*:*:*:*:*:*
rack_project rack 1.1.2 cpe:2.3:a:rack_project:rack:1.1.2:*:*:*:*:*:*:*
rack_project rack 1.2.0 cpe:2.3:a:rack_project:rack:1.2.0:*:*:*:*:*:*:*
rack_project rack 1.2.1 cpe:2.3:a:rack_project:rack:1.2.1:*:*:*:*:*:*:*
rack_project rack 1.2.2 cpe:2.3:a:rack_project:rack:1.2.2:*:*:*:*:*:*:*
rack_project rack 1.2.3 cpe:2.3:a:rack_project:rack:1.2.3:*:*:*:*:*:*:*
rack_project rack 1.2.4 cpe:2.3:a:rack_project:rack:1.2.4:*:*:*:*:*:*:*
rack_project rack 1.3.0 cpe:2.3:a:rack_project:rack:1.3.0:*:*:*:*:*:*:*
rack_project rack 1.3.1 cpe:2.3:a:rack_project:rack:1.3.1:*:*:*:*:*:*:*
rack_project rack 1.3.2 cpe:2.3:a:rack_project:rack:1.3.2:*:*:*:*:*:*:*
rack_project rack 1.3.3 cpe:2.3:a:rack_project:rack:1.3.3:*:*:*:*:*:*:*
rack_project rack 1.3.4 cpe:2.3:a:rack_project:rack:1.3.4:*:*:*:*:*:*:*
rack_project rack 1.3.5 cpe:2.3:a:rack_project:rack:1.3.5:*:*:*:*:*:*:*
rack_project rack 1.3.6 cpe:2.3:a:rack_project:rack:1.3.6:*:*:*:*:*:*:*
rack_project rack 1.4.0 cpe:2.3:a:rack_project:rack:1.4.0:*:*:*:*:*:*:*
rack_project rack 1.4.1 cpe:2.3:a:rack_project:rack:1.4.1:*:*:*:*:*:*:*

References for CVE-2012-6109

cvelogic Threat Intelligence