HOMEVULNERABILITIESCVE-2021-23520
CRITICAL

CVE-2021-23520

CWE-22Published: January 31, 2022· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-23520 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

juce1 product(s)
juce
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/juce-framework/JUCE/commit/2e874e80cba0152201aff6a4d0dc407997d10a7f
PATCHhttps://snyk.io/vuln/SNYK-UNMANAGED-JUCEFRAMEWORKJUCE-2388607
PATCHhttps://github.com/juce-framework/JUCE/commit/2e874e80cba0152201aff6a4d0dc407997d10a7f
PATCHhttps://snyk.io/vuln/SNYK-UNMANAGED-JUCEFRAMEWORKJUCE-2388607
ADVISORYhttps://snyk.io/research/zip-slip-vulnerability
ADVISORYhttps://snyk.io/research/zip-slip-vulnerability

All References (6)

→
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

Quick Facts

CVE IDCVE-2021-23520
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-22
CISA KEVNo
Affected1 vendor(s)
PublishedJan 31, 2022

Related CVEs (CWE-22)

CVE-2010-5324
10.0
CVE-2026-39861
10.0
CVE-2011-1565
10.0
CVE-2012-4959
10.0
CVE-2025-54261
10.0
CVE-2026-48282
KEV10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-23520 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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