CVE-2021-23520

Name: CVE-2021-23520
Creator: NVD / NIST
Published: 2022-01-31T11:15:07.82+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.09%

Last modified Jun 17, 2026

CVE-2021-23520 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The package juce-framework/juce before 6.1.5 are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) via the ZipFile::uncompressEntry function in juce_ZipFile.cpp. This vulnerability is triggered when the archive is extracted upon calling uncompressTo() on a ZipFile object.. EPSS estimates a 1.09% chance of exploitation in the next 30 days.

Description

The package juce-framework/juce before 6.1.5 are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) via the ZipFile::uncompressEntry function in juce_ZipFile.cpp. This vulnerability is triggered when the archive is extracted upon calling uncompressTo() on a ZipFile object.

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

1.09%

61.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

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/research/zip-slip-vulnerabilityExploit, Technical Description, Third Party Advisory
https://snyk.io/vuln/SNYK-UNMANAGED-JUCEFRAMEWORKJUCE-2388607Exploit, Patch, Third Party Advisory
https://github.com/juce-framework/JUCE/commit/2e874e80cba0152201aff6a4d0dc407997d10a7fPatch, Third Party Advisory
https://snyk.io/research/zip-slip-vulnerabilityExploit, Technical Description, Third Party Advisory
https://snyk.io/vuln/SNYK-UNMANAGED-JUCEFRAMEWORKJUCE-2388607Exploit, Patch, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-23520?

How severe is CVE-2021-23520?

CVE-2021-23520 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.09% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23520?

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-2021-23520?

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

Scan your code now

Source: NVD / NIST