Is CVE-2021-37220 in the CISA KEV catalog?

No. CVE-2021-37220 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-37220?

CVE-2021-37220 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-37220?

CVE-2021-37220 has an EPSS score of 1.33% (68th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-37220?

Upgrade mupdf on debian 11 to 1.17.0+ds1-2 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-37220

MEDIUM

5.5

CVSS v3

NVD

Description

MuPDF through 1.18.1 has an out-of-bounds write because the cached color converter does not properly consider the maximum key size of a hash table. This can, for example, be seen with crafted "mutool draw" input.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

mupdfDebian

Fixed in:1.17.0+ds1-2CVE-2021-37220

libmupdf-devUbuntu

Fixed in:1.7a-1ubuntu0.1~esm1USN-7825-1

Fixed in:1.12.0+ds1-1ubuntu0.1~esm1USN-7825-1

Fixed in:1.16.1+ds1-1ubuntu1+esm1USN-7825-1

mupdfUbuntu

Fixed in:1.7a-1ubuntu0.1~esm1USN-7825-1

Fixed in:1.12.0+ds1-1ubuntu0.1~esm1USN-7825-1

Fixed in:1.16.1+ds1-1ubuntu1+esm1USN-7825-1

mupdf-toolsUbuntu

Fixed in:1.7a-1ubuntu0.1~esm1USN-7825-1

Fixed in:1.12.0+ds1-1ubuntu0.1~esm1USN-7825-1

Fixed in:1.16.1+ds1-1ubuntu1+esm1USN-7825-1

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 ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.33%probability of exploitation in 30 days

68thpercentile

Moderate risk: more likely to be exploited than 68% of all known CVEs.

References

Exploit1

bugs.ghostscript.com

Other references2

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	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.