CVE-2020-29007

Name: CVE-2020-29007
Creator: NVD / NIST
Published: 2023-04-15T22:15:06.977+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.32%

Last modified Jun 17, 2026

CVE-2020-29007 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The Score extension through 0.3.0 for MediaWiki has a remote code execution vulnerability due to improper sandboxing of the GNU LilyPond executable. This allows any user with an ability to edit articles (potentially including unauthenticated anonymous users) to execute arbitrary Scheme or shell code by using crafted {{Image data to generate musical scores containing malicious code.. EPSS estimates a 2.32% chance of exploitation in the next 30 days.

Description

The Score extension through 0.3.0 for MediaWiki has a remote code execution vulnerability due to improper sandboxing of the GNU LilyPond executable. This allows any user with an ability to edit articles (potentially including unauthenticated anonymous users) to execute arbitrary Scheme or shell code by using crafted {{Image data to generate musical scores containing malicious code.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.32%

81.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mediawiki	Score	<= 0.3.0

References

https://github.com/seqred-s-a/cve-2020-29007Exploit, Mitigation, Third Party Advisory
https://phabricator.wikimedia.org/T257062Exploit, Third Party Advisory
https://seqred.pl/en/cve-2020-29007-remote-code-execution-in-mediawiki-score/Exploit, Third Party Advisory
https://www.mediawiki.org/wiki/Extension:ScoreVendor Advisory
https://www.mediawiki.org/wiki/Extension:Score/2021_security_advisoryVendor Advisory
https://github.com/seqred-s-a/cve-2020-29007Exploit, Mitigation, Third Party Advisory
https://phabricator.wikimedia.org/T257062Exploit, Third Party Advisory
https://seqred.pl/en/cve-2020-29007-remote-code-execution-in-mediawiki-score/Exploit, Third Party Advisory
https://www.mediawiki.org/wiki/Extension:ScoreVendor Advisory
https://www.mediawiki.org/wiki/Extension:Score/2021_security_advisoryVendor Advisory

Timeline

Published: Apr 15, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-29007?

How severe is CVE-2020-29007?

CVE-2020-29007 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.32% probability of exploitation in the next 30 days.

How do I fix CVE-2020-29007?

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-2020-29007?

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

Scan your code now

Source: NVD / NIST