CVE-2020-29007Public exploitNetwork attack vector

Remote code execution via unsandboxed LilyPond markup

Published Apr 15, 2023 · Updated Feb 6, 2025

Remote code execution in MediaWiki Score 0.3.0 and earlier allows remote attackers to run code through crafted LilyPond notation. The extension passes user-controlled notation to GNU LilyPond without -dsafe, allowing embedded Guile Scheme to invoke the operating-system shell. The attacker must be able to edit an article; anonymous editing exposes the webserver process without authentication.

CVSS severity9.8
Critical
EPSS probability2.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in MediaWiki Score 0.3.0 and earlier allows remote attackers to run code through crafted LilyPond notation. The extension passes user-controlled notation to GNU LilyPond without -dsafe, allowing embedded Guile Scheme to invoke the operating-system shell. The attacker must be able to edit an article; anonymous editing exposes the webserver process without authentication.

The record

CVE
CVE-2020-29007
Published
Apr 15, 2023
Updated
Feb 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-96, CWE-94, T1059.004, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-96Improper Neutralization of Directives in Statically Saved Code ('Static Code Injection')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.004Command and Scripting Interpreter: Unix Shell
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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