How severe is CVE-2013-4363?

CVE-2013-4363 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2013-4363 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-4363?

CVE-2013-4363 primarily affects Rubygems. In total, 71 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-4363?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2013-4363 published?

CVE-2013-4363 was published on 2013-10-17 and last updated on 2026-06-16.

CVE-2013-4363

CVE-2013-4363 is a medium-severity vulnerability in Rubygems with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Rubygems
Published: 2013-10-17
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2013-4363?: CVE-2013-4363 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2013-4363 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-4363?: CVE-2013-4363 primarily affects Rubygems. In total, 71 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-4363?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-4363 published?: CVE-2013-4363 was published on 2013-10-17 and last updated on 2026-06-16.

References

Affected products (71)

cpe:2.3:a:rubygems:rubygems:*:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.0:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.1:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.2:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.3:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.4:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.5:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.6:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.7:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.8:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.9:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.10:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.11:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.12:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.13:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.14:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.15:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.16:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.17:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.18:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.19:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.20:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.21:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.22:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.24:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.25:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:1.8.26:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.0:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.0:preview2:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.0:preview2.1:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.0:preview2.2:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.2:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.3:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.4:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.5:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.6:*:*:*:*:*:*:*
cpe:2.3:a:rubygems:rubygems:2.0.7:*:*:*:*:*:*:*

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