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Fencer Vulns
high 7.8

CVE-2021-3407 in the critical feed json

A flaw was found in mupdf 1.18.0.

published 2021-02-23 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26735

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
50.2%
EPSS 50.2% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

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

Patch / fix

  • artifex mupdf 1.18.0
  • mupdf Debian 14, Debian 13, Debian 12 1.17.0+ds1-1.3

debian advisories DEBIAN-CVE-2021-3407

  • mupdf Ubuntu Pro 16.04 LTS 1.7a-1ubuntu0.1~esm1
  • mupdf Ubuntu Pro 18.04 LTS 1.12.0+ds1-1ubuntu0.1~esm1
  • mupdf Ubuntu Pro 20.04 LTS 1.16.1+ds1-1ubuntu1+esm1

ubuntu advisories UBUNTU-CVE-2021-3407

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • mupdf Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 1.18.0-r1

alpine advisories ALPINE-CVE-2021-3407

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • mupdf Arch Linux 1.18.0-2
  • zathura-pdf-mupdf Arch Linux 0.3.6-5

arch linux advisories AVG-1602AVG-1705

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3407 updated cvss 7.8

mupdf: Double free of object during linearization

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

50.23% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • n/a mupdf
  • artifex mupdf

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.