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Fencer Vulns
medium 6.1

CVE-2020-25664 json

In WriteOnePNGImage() of the PNG coder at coders/png.c, an improper call to AcquireVirtualMemory() and memset() allows for an out-of-bounds…

published 2020-12-08 5 y ago modified 2026-07-30 3 mo ago also EUVD-2020-18326 , JLSEC-2026-841

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

In WriteOnePNGImage() of the PNG coder at coders/png.c, an improper call to AcquireVirtualMemory() and memset() allows for an out-of-bounds write later when PopShortPixel() from MagickCore/quantum-private.h is called. The patch fixes the calls by adding 256 to rowbytes. An attacker who is able to supply a specially crafted image could affect availability with a low impact to data integrity. This flaw affects ImageMagick versions prior to 6.9.10-68 and 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-2020-25664

  • imagemagick Ubuntu Pro 16.04 LTS 8:6.8.9.9-7ubuntu5.16+esm2

ubuntu advisories UBUNTU-CVE-2020-25664

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
  • ImageMagick SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 6.4.3.6-78.135.1

suse advisories SUSE-SU-2021:0199-1SUSE-SU-2021:0156-1SUSE-SU-2021:0153-1SUSE-SU-2021:14598-1

  • 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-2020-25664 updated cvss 6.1

ImageMagick: heap-based buffer overflow in PopShortPixel in MagickCore/quantum-private.h

  • 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

0.72% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1891605 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:N/I:P/A:P
OSV 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/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.