Out-of-bounds Read in Python Pillow

CVE-2021-25291

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.

Vulnerability class: Buffer Overflow

EPSS: 0.014 (70.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Python Pillow
N/a — versions n/a

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

Public proof-of-concept exploits

References

cve@mitre.org (x_refsource_MISC, Release Notes, Vendor Advisory)
cve@mitre.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)

Frequently asked questions

What is CVE-2021-25291?: CVE-2021-25291 is a high-severity vulnerability in Python Pillow, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2021-03-19.
How severe is CVE-2021-25291?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-25291 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.