Is CVE-2021-41817 in the CISA KEV catalog?

No. CVE-2021-41817 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-41817?

CVE-2021-41817 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-41817?

CVE-2021-41817 has an EPSS score of 3.22% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-41817?

Upgrade ruby2.7 on debian 11 to 2.7.4-1+deb11u1 or later. Fixes are available for 10 affected products.

CVE & CISA-KEV Catalog

CVE-2021-41817

HIGHEPSS 87th pctl

7.5

CVSS v3

NVD

Description

Date.parse in the date gem through 3.2.0 for Ruby allows ReDoS (regular expression Denial of Service) via a long string. The fixed versions are 3.2.1, 3.1.2, 3.0.2, and 2.0.1.

CWE-1333

How to fix

Remediation Available

ruby2.7Debian

Fixed in:2.7.4-1+deb11u1CVE-2021-41817

ruby2.3Ubuntu

Fixed in:2.3.1-2~ubuntu16.04.16+esm2USN-5235-1

ruby2.5Ubuntu

Fixed in:2.5.1-1ubuntu1.11USN-5235-1

ruby2.7Ubuntu

Fixed in:2.7.0-5ubuntu1.6USN-5235-1

Ruby 3.0Windows application

Affected:2.6.0 2.6.9Fixed in:2.6.9RubyInstaller Team

Affected:2.7.0 2.7.5Fixed in:2.7.5RubyInstaller Team

Affected:3.0.0 3.0.3Fixed in:3.0.3RubyInstaller Team

Ruby 3.1Windows application

Affected:3.0.0 3.0.3Fixed in:3.0.3RubyInstaller Team

Affected:2.7.0 2.7.5Fixed in:2.7.5RubyInstaller Team

Affected:2.6.0 2.6.9Fixed in:2.6.9RubyInstaller Team

Ruby 3.2Windows application

Affected:2.6.0 2.6.9Fixed in:2.6.9RubyInstaller Team

Affected:2.7.0 2.7.5Fixed in:2.7.5RubyInstaller Team

Affected:3.0.0 3.0.3Fixed in:3.0.3RubyInstaller Team

Ruby 3.2 with MSYS2Windows application

Affected:2.7.0 2.7.5Fixed in:2.7.5RubyInstaller Team

Affected:3.0.0 3.0.3Fixed in:3.0.3RubyInstaller Team

Affected:2.6.0 2.6.9Fixed in:2.6.9RubyInstaller Team

Ruby 3.3Windows application

Affected:3.0.0 3.0.3Fixed in:3.0.3RubyInstaller Team

Affected:2.6.0 2.6.9Fixed in:2.6.9RubyInstaller Team

Affected:2.7.0 2.7.5Fixed in:2.7.5RubyInstaller Team

Ruby 3.3 with MSYS2Windows application

Affected:2.6.0 2.6.9Fixed in:2.6.9RubyInstaller Team

Affected:3.0.0 3.0.3Fixed in:3.0.3RubyInstaller Team

Affected:2.7.0 2.7.5Fixed in:2.7.5RubyInstaller Team

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

3.22%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Exploit1

ruby-lang.org

Other references4

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.