CVE-2021-21417
MEDIUMCVSS 5.5/10EPSS 0.94%
Last modified
CVE-2021-21417 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.. EPSS estimates a 0.94% chance of exploitation in the next 30 days.
Description
fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Fluidsynth | Fluidsynth | < 2.1.8 |
| Debian | Debian Linux | 9.0 |
References
- https://github.com/FluidSynth/fluidsynth/issues/808Exploit, Third Party Advisory
- https://github.com/FluidSynth/fluidsynth/pull/810Exploit, Issue Tracking, Patch, Third Party Advisory
- https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-6fcq-pxhc-jxc9Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00027.htmlMailing List, Third Party Advisory
- https://github.com/FluidSynth/fluidsynth/issues/808Exploit, Third Party Advisory
- https://github.com/FluidSynth/fluidsynth/pull/810Exploit, Issue Tracking, Patch, Third Party Advisory
- https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-6fcq-pxhc-jxc9Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00027.htmlMailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-21417?
fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.
How severe is CVE-2021-21417?
CVE-2021-21417 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.94% probability of exploitation in the next 30 days.
How do I fix CVE-2021-21417?
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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