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Fencer Vulns
medium 5.5

CVE-2021-3630 json

An out-of-bounds write vulnerability was found in DjVuLibre in DJVU::DjVuTXT::decode() in DjVuText.cpp via a crafted djvu file which may le…

published 2021-06-30 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26932

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

An out-of-bounds write vulnerability was found in DjVuLibre in DJVU::DjVuTXT::decode() in DjVuText.cpp via a crafted djvu file which may lead to crash and segmentation fault. This flaw affects DjVuLibre versions prior to 3.5.28.

Patch / fix

  • djvulibre_project djvulibre 3.5.28
  • djvulibre Debian 14, Debian 13, Debian 12 3.5.27.1-12

debian advisories DEBIAN-CVE-2021-3630

  • djvulibre Ubuntu 18.04 LTS 3.5.27.1-8ubuntu0.4
  • djvulibre Ubuntu Pro 16.04 LTS 3.5.27.1-5ubuntu0.1+esm2

ubuntu advisories UBUNTU-CVE-2021-3630

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

  • djvulibre SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +10 more 3.5.27-3.19.1
  • djvulibre SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 3.5.25.3-5.19.2
  • djvulibre SLE Module for Package Hub 15 SP3, SLE Module for Package Hub 15 SP2, SLE Module for Desktop Applications 15 SP3 +1 more 3.5.27-11.11.1
  • djvulibre SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 3.5.21-3.18.1
  • djvulibre SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 3.5.21-3.15.1

suse advisories SUSE-SU-2021:2796-1SUSE-SU-2021:2621-1SUSE-SU-2021:2619-1SUSE-SU-2021:14773-1SUSE-SU-2021:14761-1

  • djvulibre openSUSE Leap 15.2 3.5.27-lp152.7.9.1
  • djvulibre openSUSE Leap 15.3 3.5.27-11.11.1

opensuse advisories openSUSE-SU-2021:1112-1openSUSE-SU-2021:2619-1

  • djvulibre Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 3.5.28-r1

alpine advisories ALPINE-CVE-2021-3630

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

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-2021-3630 updated cvss 5.5

djvulibre: out-of-bounds write in DJVU::DjVuTXT::decode() in DjVuText.cpp

  • 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

Exploit prediction

1.01% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

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

Affected products

  • n/a djvulibre

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.