PT-2021-17672 · Pillow+9 · Pillow+9

Published 2021-03-03 · Updated 2025-08-15 · CVE-2021-27923

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions: Pillow versions prior to 8.1.1

Description: The issue allows attackers to cause a denial of service due to memory consumption. This occurs because the reported size of a contained image is not properly checked for an ICO container, leading to potentially very large attempted memory allocations.

Recommendations: For Pillow versions prior to 8.1.1, update to version 8.1.1 or later to resolve the issue. As a temporary workaround, consider restricting the processing of ICO containers to minimize the risk of exploitation.

Fix

DoS

Resource Exhaustion

RCE

Weakness Enumeration

CWE-400

CWE-20

Related Identifiers

ALSA-2021:4149

ALT-PU-2021-1491

ALT-PU-2021-1617

BIT-PILLOW-2021-27923

CESA-2021_4149

CVE-2021-27923

GHSA-95Q3-8GR9-GM8W

OESA-2021-1127

OESA-2021-1146

OPENSUSE-SU-2021:1134-1

OPENSUSE-SU-2021_1134-1

OPENSUSE-SU-2024_1673-1

PYSEC-2021-42

RHSA-2021:4149

RHSA-2021_4149

RLSA-2021:4149

SUSE-SU-2021:1938-1

SUSE-SU-2021:1939-1

SUSE-SU-2021:1940-1

SUSE-SU-2024:1673-1

SUSE-SU-2024:1673-2

USN-4763-1

Affected Products

Alt Linux

Almalinux

Astra Linux

Centos

Linuxmint

Pillow

Red Hat

Rocky Linux

Suse

Ubuntu

References · 136

• https://osv.dev/vulnerability/UBUNTU-CVE-2021-27923 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-27923 · Vendor Advisory
• https://pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html · Vendor Advisory
• https://osv.dev/vulnerability/BIT-pillow-2021-27923 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2021-1146 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-27923 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/[e-mail]/message/TQQY6472RX4J2SUJENWDZAWKTJJGP2ML · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4763-1 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2021-27923 · Vendor Advisory
• https://osv.dev/vulnerability/PYSEC-2021-42 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-27923 · Security Note
• https://lists.fedoraproject.org/archives/list/[e-mail]/message/ZTSY25UJU7NJUFHH3HWT575LT4TDFWBZ · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-25292 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQQY6472RX4J2SUJENWDZAWKTJJGP2ML · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/[e-mail]/message/S7G44Z33J4BNI2DPDROHWGVG2U7ZH5JU · Vendor Advisory