Is CVE-2021-31799 in the CISA KEV catalog?

No. CVE-2021-31799 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-31799?

CVE-2021-31799 has a CVSS v3 base score of 7.0 (HIGH).

What is the EPSS score for CVE-2021-31799?

CVE-2021-31799 has an EPSS score of 1.48% (71th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-31799?

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

CVE & CISA-KEV Catalog

CVE-2021-31799

HIGHEPSS 71th pctl

7.0

CVSS v3

NVD

Description

In RDoc 3.11 through 6.x before 6.3.1, as distributed with Ruby through 3.0.1, it is possible to execute arbitrary code via | and tags in a filename.

CWE-78OS Command Injection

How to fix

Remediation Available

ruby2.7Debian

Fixed in:2.7.4-1CVE-2021-31799

libruby2.3Ubuntu

Fixed in:2.3.1-2~ubuntu16.04.16+esm1USN-5020-1

libruby2.5Ubuntu

Fixed in:2.5.1-1ubuntu1.10USN-5020-1

libruby2.7Ubuntu

Fixed in:2.7.0-5ubuntu1.5USN-5020-1

ruby2.3Ubuntu

Fixed in:2.3.1-2~ubuntu16.04.16+esm1USN-5020-1

ruby2.5Ubuntu

Fixed in:2.5.1-1ubuntu1.10USN-5020-1

ruby2.7Ubuntu

Fixed in:2.7.0-5ubuntu1.5USN-5020-1

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 VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.48%probability of exploitation in 30 days

71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

References

Patch2

Third-Party Advisory3

Other references1

security.gentoo.org

Related Vulnerabilities

Other CWE-78 (OS Command Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-1498	Critical	9.8	100%	KEV	Fix
CVE-2014-6271	Critical	9.8	100%	KEV	Fix
CVE-2019-16920	Critical	9.8	100%	KEV	-
CVE-2022-44877	Critical	9.8	100%	KEV	Fix
CVE-2020-8515	Critical	9.8	100%	KEV	-
CVE-2020-9054	Critical	9.8	100%	KEV	Fix

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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.