CVE-2021-23521: This affects the package juce-framework/JUCE before 6.1.5

Q: How do I fix CVE-2021-23521?

juce: upgrade to 6.1.5. Exact commands for each OS are on this page.

Q: Is CVE-2021-23521 being exploited?

CVE-2021-23521 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-23521 affect?

CVE-2021-23521 affects juce. Severity is medium (CVSS 5.5). 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

Q: How urgent is CVE-2021-23521?

Priority 36/100. Public exploit reference

Routine

MEDIUM 5.5UPGRADE

CVE-2021-23521 is a medium-severity flaw (CVSS 5.5) affecting juce. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 54%)
CISA exploited list	No
Weakness	CWE-59
Published	2022-01-31
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: juce

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-01-31 11:15 UTCPublished CVE record published
2026-06-17 03:38 UTCUpdated Record last modified

juce juce UPGRADE

Affected: < 6.1.5

Fixed in: 6.1.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy juce || rpm -q juce || juce --version

2. UPGRADE to 6.1.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade juce

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade juce

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-23521?

juce: upgrade to 6.1.5. Exact commands for each OS are on this page.

Is CVE-2021-23521 being exploited?

CVE-2021-23521 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-23521 affect?

CVE-2021-23521 affects juce. Severity is medium (CVSS 5.5). 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

How urgent is CVE-2021-23521?

Priority 36/100. Public exploit reference

Related CVEs

CVE-2021-23520 MEDIUM 5.5 UPGRADE The package juce-framework/juce before 6.1.5 are vulnerable to Arbitrary File Write via Archive Extraction (Zi

References

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