CVE-2023-22899

Name: CVE-2023-22899
Creator: NVD / NIST
Published: 2023-01-10T02:15:09.997+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 0.62%

Last modified Jun 17, 2026

CVE-2023-22899 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. Zip4j through 2.11.2, as used in Threema and other products, does not always check the MAC when decrypting a ZIP archive.. EPSS estimates a 0.62% chance of exploitation in the next 30 days.

Description

Zip4j through 2.11.2, as used in Threema and other products, does not always check the MAC when decrypting a ZIP archive.

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

0.62%

45.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zip4j Project	Zip4j	<= 2.11.2

References

https://breakingthe3ma.appThird Party Advisory
https://breakingthe3ma.app/files/Threema-PST22.pdfExploit, Technical Description, Third Party Advisory
https://github.com/srikanth-lingala/zip4j/issues/485Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/srikanth-lingala/zip4j/releasesRelease Notes, Third Party Advisory
https://news.ycombinator.com/item?id=34316206Third Party Advisory
https://threema.ch/en/blog/posts/news-alleged-weaknesses-statementVendor Advisory
https://breakingthe3ma.appThird Party Advisory
https://breakingthe3ma.app/files/Threema-PST22.pdfExploit, Technical Description, Third Party Advisory
https://github.com/srikanth-lingala/zip4j/issues/485Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/srikanth-lingala/zip4j/releasesRelease Notes, Third Party Advisory
https://news.ycombinator.com/item?id=34316206Third Party Advisory
https://threema.ch/en/blog/posts/news-alleged-weaknesses-statementVendor Advisory

Timeline

Published: Jan 10, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-22899?

Zip4j through 2.11.2, as used in Threema and other products, does not always check the MAC when decrypting a ZIP archive.

How severe is CVE-2023-22899?

CVE-2023-22899 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.

How do I fix CVE-2023-22899?

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-2023-22899?

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

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Source: NVD / NIST