CVE-2021-23520

Arbitrary File Write via Archive Extraction (Zip Slip)

5.5 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: High
Availability: None

Exploit likelihood

1.09%Up 0.3 points since Feb 1, 2022

What each source reports

CVE List Score used 5.5

Arbitrary File Write via Archive Extraction (Zip Slip)

Record: CVE-2021-23520
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Updated: 2026-11-02

EUVDEUVD-2021-10487 5.5

Record: EUVD-2021-10487
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-qpj6-xj62-7c95 No score

The package juce-framework/juce before 6.1.5 are vulnerable to Arbitrary File Write via Archive...

Record: GHSA-qpj6-xj62-7c95
Weakness: CWE-22
Updated: 2026-11-02

NVD 5.5

Record: CVE-2021-23520
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-22
Updated: 2026-11-02

OSV 9.8

Record: CVE-2021-23520
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-23520 9.8

Record: DEBIAN-CVE-2021-23520
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-23520 5.5

Record: UBUNTU-CVE-2021-23520
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

juce

Affected packages

Affected packages
Package	Affected	Fixed
`juce` Debian:12	before 6.1.5~ds0-1	6.1.5~ds0-1
`juce` Debian:13	before 6.1.5~ds0-1	6.1.5~ds0-1
`juce` Debian:14	before 6.1.5~ds0-1	6.1.5~ds0-1
`juce` Ubuntu:16.04:LTS	All versions, plus listed versions 4.1.0+repack-3	None known
`juce` Ubuntu:18.04:LTS	All versions, plus listed versions 4.3.0~repack-15.2.0~repack-15.2.0~repack-25.2.0~repack-35.2.1~repack-15.2.1~repack-2	None known
`juce` Ubuntu:20.04:LTS	All versions, plus listed versions 5.4.4~repack0-35.4.5~ds0-15.4.6~ds0-15.4.7~ds0-1	None known
`juce` Ubuntu:22.04:LTS	All versions, plus listed versions 5.4.7~ds0-26.1.3~ds0-16.1.4~ds0-16.1.5~ds0-1	None known
`juce` Ubuntu:24.04:LTS	All versions, plus listed versions 7.0.5+ds-17.0.5+ds-1build17.0.5+ds-1build27.0.5+ds-2	None known
`juce` Ubuntu:25.10	All versions, plus listed versions 8.0.6+ds-2	None known
`juce` Ubuntu:26.10	All versions, plus listed versions 8.0.12+ds-18.0.13+ds-18.0.14+ds-1	None known
`juce` Ubuntu:26.04:LTS	All versions, plus listed versions 8.0.6+ds-28.0.12+ds-1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-23520 is a medium vulnerability (CVSS 5.5) in Juce, published January 31, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.09%, the 65th percentile. Fixed in juce 6.1.5~ds0-1.