CVE-2021-28676

moderate-risk
Published 2021-06-02

An issue was discovered in Pillow before 8.2.0. For FLI data, FliDecode did not properly check that the block advance was non-zero, potentially leading to an infinite loop on load.

Do I need to act?

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0.37% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (2)

Affected Vendors

Python Fedoraproject

References (12)

Patch https://github.com/python-pillow/Pillow/commit/bb6c11fb889e6c11b0ee122b828132ee7...
Third Party Advisory https://github.com/python-pillow/Pillow/pull/5377
Third Party Advisory https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html
Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Release Notes https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28676-f...
Third Party Advisory https://security.gentoo.org/glsa/202107-33
Patch https://github.com/python-pillow/Pillow/commit/bb6c11fb889e6c11b0ee122b828132ee7...
Third Party Advisory https://github.com/python-pillow/Pillow/pull/5377
Third Party Advisory https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html
Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Release Notes https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28676-f...
Third Party Advisory https://security.gentoo.org/glsa/202107-33
34
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 1/34 · Minimal
Exposure 7/34 · Low