Deserialization of Untrusted Data in Apache Log4j
CVE-2020-9493 identified a deserialization issue that was present in Apache Chainsaw. Prior to Chainsaw V2.0 Chainsaw was a component of Apache Log4j 1.2.x where the same issue exists.
Users are advised to migrate from log4j:log4j to org.apache.logging.log4j:log4j for an updated version of the library.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | log4j:log4j | <= 1.2.17 | no fix |
| Java / Kotlin (Maven) | org.zenframework.z8.dependencies.commons:log4j-1.2.17 | <= 2.0 | no fix |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-502- Platform
- Java / Kotlin (Maven)
- Package
log4j:log4j, org.zenframework.z8.dependencies.commons:log4j-1.2.17- Disclosed
- 19.01.2022
- Updated
- 11.10.2026 11:21
Sources and licenses
OSV / GitHub Advisory Database - GHSA-f7vh-qwp3-x37m - CC BY 4.0
Vulnerability history: log4j:log4j
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 01.2020 03.2023
- Without a fix
- 5
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 3
Disclosures per year
- 2020: 1
- 2021: 1
- 2022: 3
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 0
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Deserialization of Untrusted Data in Apache Log4j this entry
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