CVE-2021-29063

Name: CVE-2021-29063
Creator: NVD / NIST
Published: 2021-06-21T20:15:09.477+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.10%

Last modified Jun 17, 2026

CVE-2021-29063 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in Mpmath v1.0.0 through v1.2.1 when the mpmathify function is called.. EPSS estimates a 4.10% chance of exploitation in the next 30 days.

Description

A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in Mpmath v1.0.0 through v1.2.1 when the mpmathify function is called.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

4.10%

89.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Mpmath	Mpmath	>= 1.0.0, <= 1.2.1
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34
Fedoraproject	Fedora	35

References

https://github.com/fredrik-johansson/mpmath/commit/46d44c3c8f3244017fe1eb102d564eb4ab8ef750Patch, Third Party Advisory
https://github.com/mpmath/mpmath/releases/tag/1.3.0
https://github.com/npm/hosted-git-info/pull/76Patch, Third Party Advisory
https://github.com/yetingli/PoCs/blob/main/CVE-2021-29063/Mpmath.mdExploit, Patch, Third Party Advisory
https://github.com/yetingli/SaveResults/blob/main/js/hosted-git-info.jsNot Applicable, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3M5O55E7VUDMXCPQR6MQTOIFDKHP36AA/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EIUX3XWY2K3MSO7QXMZXQQYAURARSPC5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MS2U6GLXQSRZJE2HVUAUMVFR2DWQLCZG/
https://www.npmjs.com/package/hosted-git-infoProduct
https://github.com/fredrik-johansson/mpmath/commit/46d44c3c8f3244017fe1eb102d564eb4ab8ef750Patch, Third Party Advisory
https://github.com/mpmath/mpmath/releases/tag/1.3.0
https://github.com/npm/hosted-git-info/pull/76Patch, Third Party Advisory
https://github.com/yetingli/PoCs/blob/main/CVE-2021-29063/Mpmath.mdExploit, Patch, Third Party Advisory
https://github.com/yetingli/SaveResults/blob/main/js/hosted-git-info.jsNot Applicable, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3M5O55E7VUDMXCPQR6MQTOIFDKHP36AA/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EIUX3XWY2K3MSO7QXMZXQQYAURARSPC5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MS2U6GLXQSRZJE2HVUAUMVFR2DWQLCZG/
https://www.npmjs.com/package/hosted-git-infoProduct

Timeline

Published: Jun 21, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-29063?

A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in Mpmath v1.0.0 through v1.2.1 when the mpmathify function is called.

How severe is CVE-2021-29063?

CVE-2021-29063 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.10% probability of exploitation in the next 30 days.

How do I fix CVE-2021-29063?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-29063?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST