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CVE-2023-22899

21
FAUCET Score

CVE-2023-22899 is a medium-severity vulnerability in Zip4j versions up to 2.11.2, affecting products like Threema, where the software fails to consistently verify the Message Authentication Code (MAC) during ZIP archive decryption. This flaw allows for a high-integrity impact without requiring user interaction, though it has a high attack complexity. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.11.2CPE matchmatch criteria
cpe:2.3:a:zip4j_project:zip4j:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.62%
Probability of exploitation in next 30 days
EPSS Percentile
46.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0062 is in the 8th percentile among its peer group of 19,956 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: net.lingala.zip4j:zip4jFixed in: 2.11.3
redhatpatch availablevia redhat_api
Product: Migration Toolkit for Runtimes 1 on RHEL 8Fixed in: org.jboss.windup-windup-parent
View patch
redhatpatch availablevia redhat_api
Product: MTA-6.2-RHEL-9Fixed in: mta/mta-operator-bundle:6.2.0-29
View patch

Vendor Advisories (2)

mavenGHSA-2pj2-gchf-wmw7medium

Zip4j Origin Validation Error

Jan 10, 2023
redhatCVE-2023-22899Moderate

zip4j: does not always check the MAC when decrypting a ZIP archive

Jan 10, 2023

References

breakingthe3ma.app
Third Party Advisory
breakingthe3ma.app / files/Threema-PST22.pdf
ExploitTechnical DescriptionThird Party Advisory
github.com / srikanth-lingala/zip4j/issues/485
ExploitIssue TrackingPatchThird Party Advisory
github.com / srikanth-lingala/zip4j/releases
Release NotesThird Party Advisory
news.ycombinator.com / item
Third Party Advisory
threema.ch / en/blog/posts/news-alleged-weaknesses-statement
Vendor Advisory