CVE-2012-5370

JRuby computes hash values without properly restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table, as demonstrated by a universal multicollision attack against the MurmurHash2 algorithm, a different vulnerability than CVE-2011-4838.

Published: 2012-11-28 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-5370 is rated Moderate Risk (42.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.60%). 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-2012-5370

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 2025-03-30 1.82% 0.60% -1.22%
2 2025-03-29 0.60% 1.82% +1.22%
3 2025-03-17 — 0.60% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-5370

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/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:L)
Exploitation conditions are straightforward and predictable.
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.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2012-5370

GitHub Security Advisory for CVE-2012-5370

GHSA-fmmq-j7pq-f85c · Severity: medium · Ecosystem: maven — JRuby denial of service via Hash Collision

OS Trackers for CVE-2012-5370

vendor priority summary link
debian not yet assigned CVE-2012-5370 not yet assigned priority: Debian including 1 source packages (jruby), 4 status rows across 4 suites (bookworm, forky, sid, trixie): resolved 4. https://security-tracker.debian.org/tracker/CVE-2012-5370
redhat medium — https://access.redhat.com/security/cve/CVE-2012-5370
ubuntu medium CVE-2012-5370 medium priority: Ubuntu including 1 source packages (jruby), 15 status rows across 15 suites (hardy, lucid, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): ignored 9, released 3, DNE 1, needed 1, not-affected 1. https://ubuntu.com/security/CVE-2012-5370

Affected software / configurations for CVE-2012-5370

Vendor Product Version Raw CPE
jruby jruby — cpe:2.3:a:jruby:jruby:-:*:*:*:*:*:*:*

References for CVE-2012-5370

cvelogic Threat Intelligence