CVE-2021-23437: The package pillow 5.2.0 and before 8.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) via the getrgb function

High severity · published Sep 3, 2021

CVE-2021-23437

The package pillow 5.2.0 and before 8.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) via the getrgb function

7.5

CVSS

3.2%

EPSS

On KEV

Description

The package pillow 5.2.0 and before 8.3.2 are vulnerable to Regular Expression Denial of Service (ReDoS) via the getrgb function.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)3.2% · higher than 88% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Fedora · Fedoraproject

33; 34 · source: NVD

Pillow · Python

5.2.0 before 8.3.2 · source: NVD

Affected product

Fedora

Fedoraproject

All Fedora CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2021-23437

CVE.org

https://www.cve.org/CVERecord?id=CVE-2021-23437

Patch

https://github.com/python-pillow/Pillow/commit/9e08eb8f78fdfd2f476e1b20b7cf38683754866b

lists.debian.org

https://lists.debian.org/debian-lts-announce/2024/03/msg00021.html

lists.fedoraproject.org

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RNSG6VFXTAROGF7ACYLMAZNQV4EJ6I2C/

lists.fedoraproject.org

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VKRCL7KKAKOXCVD7M6WC5OKFGL4L3SJT/

Release Notes

https://pillow.readthedocs.io/en/stable/releasenotes/8.3.2.html

Third Party Advisory

https://security.gentoo.org/glsa/202211-10