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CVE-2021-23520

31
FAUCET Score

CVE-2021-23520 is a critical arbitrary file write vulnerability, known as Zip Slip, affecting juce-framework/juce versions prior to 6.1.5. This flaw allows an attacker to write files to arbitrary locations on a system when a malicious archive is extracted using the ZipFile::uncompressEntry function. With a CVSS score of 9.8 (Critical), it presents a severe risk due to its network-based attack vector, low complexity, and potential for complete compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.1.5CPE matchmatch criteria
cpe:2.3:a:juce:juce:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.09%
Probability of exploitation in next 30 days
EPSS Percentile
62.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0109 is in the 47th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / juce-framework/JUCE/commit/2e874e80cba0152201aff6a4d0dc407997d10a7f
PatchThird Party Advisory
snyk.io / research/zip-slip-vulnerability
ExploitTechnical DescriptionThird Party Advisory
snyk.io / vuln/SNYK-UNMANAGED-JUCEFRAMEWORKJUCE-2388607
ExploitPatchThird Party Advisory