Is CVE-2020-21896 in the CISA KEV catalog?

No. CVE-2020-21896 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-21896?

CVE-2020-21896 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2020-21896?

CVE-2020-21896 has an EPSS score of 0.45% (36th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-21896?

Upgrade mupdf on debian 11 to 1.17.0+ds1-2+deb11u1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2020-21896

MEDIUM

5.5

CVSS v3

NVD

Description

A Use After Free vulnerability in svg_dev_text_span_as_paths_defs function in source/fitz/svg-device.c in Artifex Software MuPDF 1.16.0 allows remote attackers to cause a denial of service via opening of a crafted PDF file.

CWE-416Use After Free

How to fix

Remediation Available

mupdfDebian

Fixed in:1.17.0+ds1-2+deb11u1CVE-2020-21896

Fixed in:1.19.0+ds1-1CVE-2020-21896

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

0.45%probability of exploitation in 30 days

36thpercentile

Low risk: more likely to be exploited than 36% of all known CVEs.

References

Patch1

bugs.ghostscript.com

Other references2

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	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 2025-11-03.