CVE-2022-23307
HIGHCVE-2022-23307 is a high-severity (CVSS 8.8) Deserialization of Untrusted Data vulnerability in log4j:log4j. O3 Security confirms whether CVE-2022-23307 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
A deserialization flaw in the Chainsaw component of Log4j 1 can lead to malicious code execution.
Real-World Exposure
log4j:log4j☕org.zenframework.z8.dependencies.commons:log4j-1.2.17Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | log4j:log4j | all versions | No fix |
| ☕Maven | org.zenframework.z8.dependencies.commons:log4j-1.2.17 | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for log4j:log4j. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Remediation status
No patched version of log4j:log4j has shipped for CVE-2022-23307 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2022-23307 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2022-23307. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2022-23307 in your dependencies?
O3 detects CVE-2022-23307 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.