CVE-2013-4363

Algorithmic complexity vulnerability in Gem::Version::ANCHORED_VERSION_PATTERN in lib/rubygems/version.rb in RubyGems before 1.8.23.2, 1.8.24 through 1.8.26, 2.0.x before 2.0.10, and 2.1.x before 2.1.5, as used in Ruby 1.9.0 through 2.0.0p247, allows remote attackers to cause a denial of service (CPU consumption) via a crafted gem version that triggers a large amount of backtracking in a regular expression. NOTE: this issue is due to an incomplete fix for CVE-2013-4287.

Published: 2013-10-17 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-4363 is rated Moderate Risk (44.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.69%). EPSS rose +1.10% 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-2013-4363

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 0.59% 1.69% +1.10%
2 2025-12-28 0.55% 0.59% +0.04%
3 2025-12-27 — 0.55% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-4363

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-2013-4363

GitHub Security Advisory for CVE-2013-4363

GHSA-9qvm-2vhf-q649 · Severity: medium · Ecosystem: rubygems — RubyGems Regular Expression Denial of Service

OS Trackers for CVE-2013-4363

vendor priority summary link
debian unimportant CVE-2013-4363 unimportant priority: Debian including 1 source packages (rubygems), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2013-4363
redhat medium — https://access.redhat.com/security/cve/CVE-2013-4363
ubuntu low CVE-2013-4363 low priority: Ubuntu including 3 source packages (jruby, ruby1.9.1, rubygems), 15 status rows across 5 suites (lucid, precise, quantal, raring, upstream): ignored 13, DNE 1, needs-triage 1. https://ubuntu.com/security/CVE-2013-4363

Affected software / configurations for CVE-2013-4363

Vendor Product Version Raw CPE
rubygems rubygems <= 1.8.23 cpe:2.3:a:rubygems:rubygems:*:*:*:*:*:*:*:*
rubygems rubygems 1.8.0 cpe:2.3:a:rubygems:rubygems:1.8.0:*:*:*:*:*:*:*
rubygems rubygems 1.8.1 cpe:2.3:a:rubygems:rubygems:1.8.1:*:*:*:*:*:*:*
rubygems rubygems 1.8.2 cpe:2.3:a:rubygems:rubygems:1.8.2:*:*:*:*:*:*:*
rubygems rubygems 1.8.3 cpe:2.3:a:rubygems:rubygems:1.8.3:*:*:*:*:*:*:*
rubygems rubygems 1.8.4 cpe:2.3:a:rubygems:rubygems:1.8.4:*:*:*:*:*:*:*
rubygems rubygems 1.8.5 cpe:2.3:a:rubygems:rubygems:1.8.5:*:*:*:*:*:*:*
rubygems rubygems 1.8.6 cpe:2.3:a:rubygems:rubygems:1.8.6:*:*:*:*:*:*:*
rubygems rubygems 1.8.7 cpe:2.3:a:rubygems:rubygems:1.8.7:*:*:*:*:*:*:*
rubygems rubygems 1.8.8 cpe:2.3:a:rubygems:rubygems:1.8.8:*:*:*:*:*:*:*
rubygems rubygems 1.8.9 cpe:2.3:a:rubygems:rubygems:1.8.9:*:*:*:*:*:*:*
rubygems rubygems 1.8.10 cpe:2.3:a:rubygems:rubygems:1.8.10:*:*:*:*:*:*:*
rubygems rubygems 1.8.11 cpe:2.3:a:rubygems:rubygems:1.8.11:*:*:*:*:*:*:*
rubygems rubygems 1.8.12 cpe:2.3:a:rubygems:rubygems:1.8.12:*:*:*:*:*:*:*
rubygems rubygems 1.8.13 cpe:2.3:a:rubygems:rubygems:1.8.13:*:*:*:*:*:*:*
rubygems rubygems 1.8.14 cpe:2.3:a:rubygems:rubygems:1.8.14:*:*:*:*:*:*:*
rubygems rubygems 1.8.15 cpe:2.3:a:rubygems:rubygems:1.8.15:*:*:*:*:*:*:*
rubygems rubygems 1.8.16 cpe:2.3:a:rubygems:rubygems:1.8.16:*:*:*:*:*:*:*
rubygems rubygems 1.8.17 cpe:2.3:a:rubygems:rubygems:1.8.17:*:*:*:*:*:*:*
rubygems rubygems 1.8.18 cpe:2.3:a:rubygems:rubygems:1.8.18:*:*:*:*:*:*:*
rubygems rubygems 1.8.19 cpe:2.3:a:rubygems:rubygems:1.8.19:*:*:*:*:*:*:*
rubygems rubygems 1.8.20 cpe:2.3:a:rubygems:rubygems:1.8.20:*:*:*:*:*:*:*
rubygems rubygems 1.8.21 cpe:2.3:a:rubygems:rubygems:1.8.21:*:*:*:*:*:*:*
rubygems rubygems 1.8.22 cpe:2.3:a:rubygems:rubygems:1.8.22:*:*:*:*:*:*:*
rubygems rubygems 1.8.24 cpe:2.3:a:rubygems:rubygems:1.8.24:*:*:*:*:*:*:*
rubygems rubygems 1.8.25 cpe:2.3:a:rubygems:rubygems:1.8.25:*:*:*:*:*:*:*
rubygems rubygems 1.8.26 cpe:2.3:a:rubygems:rubygems:1.8.26:*:*:*:*:*:*:*
rubygems rubygems 2.0.0 cpe:2.3:a:rubygems:rubygems:2.0.0:*:*:*:*:*:*:*
rubygems rubygems 2.0.0 cpe:2.3:a:rubygems:rubygems:2.0.0:preview2:*:*:*:*:*:*
rubygems rubygems 2.0.0 cpe:2.3:a:rubygems:rubygems:2.0.0:preview2.1:*:*:*:*:*:*
rubygems rubygems 2.0.0 cpe:2.3:a:rubygems:rubygems:2.0.0:preview2.2:*:*:*:*:*:*
rubygems rubygems 2.0.0 cpe:2.3:a:rubygems:rubygems:2.0.0:rc1:*:*:*:*:*:*
rubygems rubygems 2.0.0 cpe:2.3:a:rubygems:rubygems:2.0.0:rc2:*:*:*:*:*:*
rubygems rubygems 2.0.1 cpe:2.3:a:rubygems:rubygems:2.0.1:*:*:*:*:*:*:*
rubygems rubygems 2.0.2 cpe:2.3:a:rubygems:rubygems:2.0.2:*:*:*:*:*:*:*
rubygems rubygems 2.0.3 cpe:2.3:a:rubygems:rubygems:2.0.3:*:*:*:*:*:*:*
rubygems rubygems 2.0.4 cpe:2.3:a:rubygems:rubygems:2.0.4:*:*:*:*:*:*:*
rubygems rubygems 2.0.5 cpe:2.3:a:rubygems:rubygems:2.0.5:*:*:*:*:*:*:*
rubygems rubygems 2.0.6 cpe:2.3:a:rubygems:rubygems:2.0.6:*:*:*:*:*:*:*
rubygems rubygems 2.0.7 cpe:2.3:a:rubygems:rubygems:2.0.7:*:*:*:*:*:*:*
rubygems rubygems 2.0.8 cpe:2.3:a:rubygems:rubygems:2.0.8:*:*:*:*:*:*:*
rubygems rubygems 2.0.9 cpe:2.3:a:rubygems:rubygems:2.0.9:*:*:*:*:*:*:*
rubygems rubygems 2.1.0 cpe:2.3:a:rubygems:rubygems:2.1.0:*:*:*:*:*:*:*
rubygems rubygems 2.1.0 cpe:2.3:a:rubygems:rubygems:2.1.0:rc1:*:*:*:*:*:*
rubygems rubygems 2.1.0 cpe:2.3:a:rubygems:rubygems:2.1.0:rc2:*:*:*:*:*:*
rubygems rubygems 2.1.1 cpe:2.3:a:rubygems:rubygems:2.1.1:*:*:*:*:*:*:*
rubygems rubygems 2.1.2 cpe:2.3:a:rubygems:rubygems:2.1.2:*:*:*:*:*:*:*
rubygems rubygems 2.1.3 cpe:2.3:a:rubygems:rubygems:2.1.3:*:*:*:*:*:*:*
rubygems rubygems 2.1.4 cpe:2.3:a:rubygems:rubygems:2.1.4:*:*:*:*:*:*:*
ruby-lang ruby 1.9 cpe:2.3:a:ruby-lang:ruby:1.9:*:*:*:*:*:*:*
ruby-lang ruby 1.9.1 cpe:2.3:a:ruby-lang:ruby:1.9.1:*:*:*:*:*:*:*
ruby-lang ruby 1.9.2 cpe:2.3:a:ruby-lang:ruby:1.9.2:*:*:*:*:*:*:*
ruby-lang ruby 1.9.3 cpe:2.3:a:ruby-lang:ruby:1.9.3:*:*:*:*:*:*:*
ruby-lang ruby 1.9.3 cpe:2.3:a:ruby-lang:ruby:1.9.3:p0:*:*:*:*:*:*
ruby-lang ruby 1.9.3 cpe:2.3:a:ruby-lang:ruby:1.9.3:p125:*:*:*:*:*:*
ruby-lang ruby 1.9.3 cpe:2.3:a:ruby-lang:ruby:1.9.3:p194:*:*:*:*:*:*
ruby-lang ruby 1.9.3 cpe:2.3:a:ruby-lang:ruby:1.9.3:p286:*:*:*:*:*:*
ruby-lang ruby 1.9.3 cpe:2.3:a:ruby-lang:ruby:1.9.3:p383:*:*:*:*:*:*
ruby-lang ruby 1.9.3 cpe:2.3:a:ruby-lang:ruby:1.9.3:p385:*:*:*:*:*:*
ruby-lang ruby 1.9.3 cpe:2.3:a:ruby-lang:ruby:1.9.3:p392:*:*:*:*:*:*
ruby-lang ruby 1.9.3 cpe:2.3:a:ruby-lang:ruby:1.9.3:p426:*:*:*:*:*:*
ruby-lang ruby 1.9.3 cpe:2.3:a:ruby-lang:ruby:1.9.3:p429:*:*:*:*:*:*
ruby-lang ruby 2.0 cpe:2.3:a:ruby-lang:ruby:2.0:*:*:*:*:*:*:*
ruby-lang ruby 2.0.0 cpe:2.3:a:ruby-lang:ruby:2.0.0:*:*:*:*:*:*:*
ruby-lang ruby 2.0.0 cpe:2.3:a:ruby-lang:ruby:2.0.0:p0:*:*:*:*:*:*
ruby-lang ruby 2.0.0 cpe:2.3:a:ruby-lang:ruby:2.0.0:p195:*:*:*:*:*:*
ruby-lang ruby 2.0.0 cpe:2.3:a:ruby-lang:ruby:2.0.0:p247:*:*:*:*:*:*
ruby-lang ruby 2.0.0 cpe:2.3:a:ruby-lang:ruby:2.0.0:preview1:*:*:*:*:*:*
ruby-lang ruby 2.0.0 cpe:2.3:a:ruby-lang:ruby:2.0.0:preview2:*:*:*:*:*:*
ruby-lang ruby 2.0.0 cpe:2.3:a:ruby-lang:ruby:2.0.0:rc1:*:*:*:*:*:*
ruby-lang ruby 2.0.0 cpe:2.3:a:ruby-lang:ruby:2.0.0:rc2:*:*:*:*:*:*

References for CVE-2013-4363

cvelogic Threat Intelligence