Critical severity · published Mar 19, 2021
CVE-2021-25289
An issue was discovered in Pillow before 8.1.1
9.8
CVSS
2.3%
EPSS
No
On KEV
Description
An issue was discovered in Pillow before 8.1.1. TiffDecode has a heap-based buffer overflow when decoding crafted YCbCr files because of certain interpretation conflicts with LibTIFF in RGBA mode. NOTE: this issue exists because of an incomplete fix for CVE-2020-35654.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.3% · higher than 84% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PI
Pillow · Python
before 8.1.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-25289
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-25289
Release Notes
https://pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html
Third Party Advisory
https://security.gentoo.org/glsa/202107-33
More from Pillow
9.8
CVE-2026-96639
Pillow multi-frame loaders can reuse stale native image storage after mode transitions
9.8
CVE-2026-112900
Pillow: Argument Injection in Ghostscript call, potentially leading into RCE
9.8
CVE-2026-112403
Pillow: Heap buffer overflow in ImagingJpegDecode
9.8
CVE-2026-112398
Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution
9.8
CVE-2026-112393
Pillow: Heap buffer overflow in _tiffWriteProc when saving TIFF to BytesIO