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Public proof of conceptFix available

CVE-2021-3407

A public proof of concept exists; no exploitation attested.

  • Published2021-02-23
  • WeaknessCWE-415

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A flaw was found in mupdf 1.18.0. Double free of object during linearization may lead to memory corruption and other potential consequences.

Timeline

dates in UTC
  1. 2021-02-2323:15CVE publishedNVD
  2. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Versions per branch

NVD · CISA-ADP
Fedoraproject fedora
BranchAffectedFixed in
32.x= 32no fix published
33.x= 33no fix published
34.x= 34no fix published
Artifex mupdf
BranchAffectedFixed in
1.18< 1.18.01.18.0
1.18= 1.18.0no fix published
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As redhat, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • mupdf
    Affected
    • = mupdf 1.18.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2021-05-26

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • mupdfUbuntu:Pro:20.04:LTSall versions · fixed in 1.16.1+ds1-1ubuntu1+esm1
  • mupdfUbuntu:Pro:18.04:LTSall versions · fixed in 1.12.0+ds1-1ubuntu0.1~esm1
  • mupdfUbuntu:Pro:16.04:LTSall versions · fixed in 1.7a-1ubuntu0.1~esm1
  • mupdfDebian:14all versions · fixed in 1.17.0+ds1-1.3
  • mupdfDebian:13all versions · fixed in 1.17.0+ds1-1.3
  • mupdfDebian:12all versions · fixed in 1.17.0+ds1-1.3
  • mupdfDebian:9all versions · fixed in 1.9a+ds1-4+deb9u6
  • mupdfCleanStartall versions · fixed in 1.18.0-r1

12 more package ranges on OSV.dev

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2024-07-22
  • CISA-ADPCVSS 3.17.82024-07-18
  • NVDCVSS 3.15.5read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • CNAweakness (CWE)CWE-415known since 2026-10-23
  • NVDweakness (CWE)CWE-415read 2026-10-23
  • FIRST EPSSEPSS score50.2 %read 2026-11-09
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published
2021-02-23
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-5qxg-m35q-xr56

Frequently asked questions

What is CVE-2021-3407?

A flaw was found in mupdf 1.18.0. Double free of object during linearization may lead to memory corruption and other potential consequences.

Is CVE-2021-3407 actively exploited?

A proof-of-concept exploit exists for CVE-2021-3407, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2021-3407?

CVE-2021-3407 has a CVSS v3 base score of 5.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

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