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Fencer Vulns
high 7.5

CVE-2021-25291 json

Out of bounds read in Pillow

published 2021-03-19 5 y ago modified 2026-09-08 2 mo ago also BIT-pillow-2021-25291 , EUVD-2021-0174 , GHSA-mvg9-xffr-p774 , PYSEC-2021-37

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

An issue was discovered in Pillow before 8.1.1. In TiffDecode.c, there is an out-of-bounds read in TiffreadRGBATile via invalid tile boundaries.

Patch / fix

  • pypi pillow 8.1.1, 8.2.0
  • bitnami pillow 8.1.1
  • python pillow 8.1.1
  • pillow Debian 14, Debian 13, Debian 12 8.1.1-1

debian advisories DEBIAN-CVE-2021-25291

  • pillow Ubuntu 20.04 LTS 7.0.0-4ubuntu0.3

ubuntu advisories UBUNTU-CVE-2021-25291

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

  • python-Pillow openSUSE Tumbleweed 12.3.0-1.1
  • python-Pillow openSUSE Tumbleweed 8.3.2-1.2
  • python-Pillow openSUSE Tumbleweed 10.3.0-1.1
  • python-Pillow openSUSE Leap 15.2 8.3.1-lp152.5.3.1
  • python-CairoSVG openSUSE Leap 15.2 2.5.1-lp152.2.3.1

opensuse advisories openSUSE-SU-2026:11261-1openSUSE-SU-2024:11209-1openSUSE-SU-2024:13827-1openSUSE-SU-2021:1134-1

  • py3-pillow Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 8.1.2-r0

alpine advisories ALPINE-CVE-2021-25291

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

  • python-pillow Arch Linux 8.1.2-1

arch linux advisories AVG-1635

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-2021-25291 updated cvss 7.5

python-pillow: out-of-bounds read in TiffReadRGBATile in TiffDecode.c

  • Red Hat Enterprise Linux 7 python-pillow, python-pillow-qt, python-pillow-tk, python-pillow-sane
    affected: workaround, no fix planned “Disable the invoice generation feature to mitigate this vulnerability in Red Hat Quay.”
  • Red Hat Enterprise Linux 9 python-pillow
    affected: workaround, no fix available “Disable the invoice generation feature to mitigate this vulnerability in Red Hat Quay.”
  • Red Hat Quay v3 quay/quay-rhel8 v3.6.0-62
    fixed: vendor fix “Disable the invoice generation feature to mitigate this vulnerability in Red Hat Quay.” RHSA-2021:3917
  • Red Hat Quay v3 quay/clair-rhel8 v3.6.0-70, quay/quay-builder-rhel8 v3.6.0-44, quay/quay-operator-rhel8 v3.6.0-43, quay/quay-operator-bundle v3.6.0-48, quay/quay-bridge-operator-rhel8 v3.6.0-40, quay/quay-bridge-operator-bundle v3.6.0-35, +3 more Red Hat Enterprise Linux 8 python-pillow, python3-pillow, python3-pillow-tk
    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

1.40% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi pillow
<8.2.0
<8.1.1
8.2.0
8.1.1
bitnami pillow
<8.1.1
8.1.1

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.