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Fencer Vulns
medium 5.5

CVE-2020-25674 json

WriteOnePNGImage() from coders/png.c (the PNG coder) has a for loop with an improper exit condition that can allow an out-of-bounds READ vi…

published 2020-12-08 5 y ago modified 2026-07-30 3 mo ago also EUVD-2020-18336 , JLSEC-2026-845

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

WriteOnePNGImage() from coders/png.c (the PNG coder) has a for loop with an improper exit condition that can allow an out-of-bounds READ via heap-buffer-overflow. This occurs because it is possible for the colormap to have less than 256 valid values but the loop condition will loop 256 times, attempting to pass invalid colormap data to the event logger. The patch replaces the hardcoded 256 value with a call to MagickMin() to ensure the proper value is used. This could impact application availability when a specially crafted input file is processed by ImageMagick. This flaw affects ImageMagick versions prior to 7.0.8-68.

Patch / fix

  • julia ImageMagick_jll 6.9.12+0
  • imagemagick imagemagick 6.9.10-68, 7.0.8-68
  • imagemagick Debian 14, Debian 13, Debian 12 8:6.9.11.24+dfsg-1

debian advisories DEBIAN-CVE-2020-25674

  • imagemagick Ubuntu 18.04 LTS 8:6.9.7.4+dfsg-16ubuntu6.11
  • imagemagick Ubuntu 20.04 LTS 8:6.9.10.23+dfsg-2.1ubuntu11.4
  • imagemagick Ubuntu Pro 16.04 LTS 8:6.8.9.9-7ubuntu5.16+esm2

ubuntu advisories UBUNTU-CVE-2020-25674

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

  • ImageMagick SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +16 more 6.8.8.1-71.154.1
  • ImageMagick SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +12 more 7.0.7.34-3.90.1
  • ImageMagick SLE Module for Development Tools 15 SP2, SLE Module for Desktop Applications 15 SP2 7.0.7.34-10.9.1

suse advisories SUSE-SU-2021:0199-1SUSE-SU-2021:0156-1SUSE-SU-2021:0153-1

  • ImageMagick openSUSE Leap 15.1 7.0.7.34-lp151.7.26.1
  • ImageMagick openSUSE Leap 15.2 7.0.7.34-lp152.12.9.1

opensuse advisories openSUSE-SU-2021:0148-1openSUSE-SU-2021:0136-1

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-2020-25674 updated cvss 5.5

ImageMagick: heap-based buffer overflow in WriteOnePNGImage in coders/png.c

  • Red Hat Enterprise Linux 5 ImageMagick Red Hat Enterprise Linux 6 ImageMagick, ImageMagick-c++, ImageMagick-perl Red Hat Enterprise Linux 7 ImageMagick, ImageMagick-c++, ImageMagick-perl
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 ImageMagick
    affected: no fix available
  • Red Hat Enterprise Linux 8 inkscape, inkscape-view
    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

1.03% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1891928 referenced PoC, tagged "exploit" by a source, unverified

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
OSV 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia ImageMagick_jll
<6.9.12+0
6.9.12+0

Affected products

  • n/a ImageMagick

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

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.