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Fencer Vulns
low 3.3

CVE-2020-27818 json

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0.

published 2020-12-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20319

cvss
3.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a malicious file to be processed by pngcheck could cause a temporary denial of service, posing a low risk to application availability.

Patch / fix

  • pngcheck Debian 14, Debian 13, Debian 12 2.3.0-13

debian advisories DEBIAN-CVE-2020-27818

  • pngcheck Ubuntu 20.04 LTS 2.3.0-7ubuntu0.20.04.1
  • pngcheck Ubuntu Pro 16.04 LTS 2.3.0-7ubuntu0.16.04.1~esm1
  • pngcheck Ubuntu Pro 18.04 LTS 2.3.0-7ubuntu0.18.04.1~esm1

ubuntu advisories UBUNTU-CVE-2020-27818

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

  • pngcheck openSUSE Tumbleweed 3.0.0-1.7
  • pngcheck Package Hub 15 SP1 2.3.0-bp151.4.3.1
  • pngcheck Package Hub 15 SP2 2.3.0-bp152.4.3.1
  • pngcheck openSUSE Leap 15.1 2.3.0-lp151.3.3.1
  • pngcheck openSUSE Leap 15.2 2.3.0-lp152.4.3.1

opensuse advisories openSUSE-SU-2024:11176-1openSUSE-SU-2020:2227-1openSUSE-SU-2020:2220-1openSUSE-SU-2020:2198-1openSUSE-SU-2020:2177-1

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-2020-27818 updated cvss 5.5

pngcheck: global buffer overflow was discovered in check_chunk_name function via crafted pngfile

  • 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

1.22% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • n/a pngcheck

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input
  • CWE-125 Out-of-bounds Read

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.