CVE-2023-22899Known exploitationPublic exploitNetwork attack vector

Integrity bypass via skipped AES MAC verification

Published Jan 10, 2023 · Updated Apr 9, 2025

Origin validation error in Zip4j 2.11.2 and earlier allows attackers to bypass integrity checks on encrypted ZIP content. AesCipherInputStream.verifyContent returned without comparing the calculated AES MAC when a DEFLATE entry used a data descriptor. Exploitation requires write access to an encrypted archive and later decryption of that entry, after which modified content is accepted as authentic.

CVSS severity5.9
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation error in Zip4j 2.11.2 and earlier allows attackers to bypass integrity checks on encrypted ZIP content. AesCipherInputStream.verifyContent returned without comparing the calculated AES MAC when a DEFLATE entry used a data descriptor. Exploitation requires write access to an encrypted archive and later decryption of that entry, after which modified content is accepted as authentic.

The record

CVE
CVE-2023-22899
Published
Jan 10, 2023
Updated
Apr 9, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-346, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.9GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-346Origin Validation Error
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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