CVE-2021-23521

Name: CVE-2021-23521
Creator: NVD / NIST
Published: 2022-01-31T11:15:07.933+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2021-23521 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. This affects the package juce-framework/JUCE before 6.1.5. This vulnerability is triggered when a malicious archive is crafted with an entry containing a symbolic link. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

Description

This affects the package juce-framework/JUCE before 6.1.5. This vulnerability is triggered when a malicious archive is crafted with an entry containing a symbolic link. When extracted, the symbolic link is followed outside of the target dir allowing writing arbitrary files on the target host. In some cases, this can allow an attacker to execute arbitrary code. The vulnerable code is in the ZipFile::uncompressEntry function in juce_ZipFile.cpp and is executed when the archive is extracted upon calling uncompressTo() on a ZipFile object.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.54%

41.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-59

Affected Software

Vendor	Product	Versions
Juce	Juce	< 6.1.5

References

https://github.com/juce-framework/JUCE/commit/2e874e80cba0152201aff6a4d0dc407997d10a7fPatch, Third Party Advisory
https://snyk.io/vuln/SNYK-UNMANAGED-JUCEFRAMEWORKJUCE-2388608Exploit, Patch, Third Party Advisory
https://github.com/juce-framework/JUCE/commit/2e874e80cba0152201aff6a4d0dc407997d10a7fPatch, Third Party Advisory
https://snyk.io/vuln/SNYK-UNMANAGED-JUCEFRAMEWORKJUCE-2388608Exploit, Patch, Third Party Advisory

Timeline

Published: Jan 31, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23521?

How severe is CVE-2021-23521?

CVE-2021-23521 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23521?

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-2021-23521?

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

Scan your code now

Source: NVD / NIST