How severe is CVE-2020-17354?

CVE-2020-17354 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-17354 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-17354?

CVE-2020-17354 affects Lilypond. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-17354?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-17354 published?

CVE-2020-17354 was published on 2023-04-15 and last updated on 2026-06-17.

CVE-2020-17354

CVE-2020-17354 is a high-severity vulnerability in Lilypond with a CVSS 3.x base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: High (CVSS 3.x base score 8.6)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Lilypond
Published: 2023-04-15
Last modified: 2026-06-17

Description

LilyPond before 2.24 allows attackers to bypass the -dsafe protection mechanism via output-def-lookup or output-def-scope, as demonstrated by dangerous Scheme code in a .ly file that causes arbitrary code execution during conversion to a different file format. NOTE: in 2.24 and later versions, safe mode is removed, and the product no longer tries to block code execution when external files are used.

Frequently asked questions

What is CVE-2020-17354?: LilyPond before 2.24 allows attackers to bypass the -dsafe protection mechanism via output-def-lookup or output-def-scope, as demonstrated by dangerous Scheme code in a .ly file that causes arbitrary code execution during conversion to a different file format. NOTE: in 2.24 and later versions, safe mode is removed, and the product no longer tries to block code execution when external files are used.
How severe is CVE-2020-17354?: CVE-2020-17354 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-17354 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-17354?: CVE-2020-17354 affects Lilypond. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-17354?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-17354 published?: CVE-2020-17354 was published on 2023-04-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lilypond:lilypond:*:*:*:*:*:*:*:*

More vulnerabilities in Lilypond

CVE-2020-17353 — Critical (CVSS 9.8): scm/define-stencil-commands.scm in LilyPond through 2.20.0, and 2.21.x through 2.21.4, when -dsafe is used, lacks…
CVE-2018-10992 — Critical (CVSS 9.8): lilypond-invoke-editor in LilyPond 2.19.80 does not validate strings before launching the program specified by the…
CVE-2017-17523 — High (CVSS 8.8): lilypond-invoke-editor in LilyPond 2.19.80 does not validate strings before launching the program specified by the…

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