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CVE-2021-45046: Apache Log4j2 Deserialization of Untrusted Data Vulnerability

criticalknown exploitedpublic exploitCVE-2021-45046
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Apache Log4j2 contains a deserialization of untrusted data vulnerability due to the incomplete fix of CVE-2021-44228, where the Thread Context Lookup Pattern is vulnerable to remote code execution in certain non-default configurations.

CSIRTS triage

vendor: Apacheproduct: Log4j2Remote code executionUnsafe deserialization
What
There is a deserialization vulnerability that can lead to remote code execution due to an incomplete fix.
Who is affected
Deployments of Apache Log4j2 are affected, particularly in non-default configurations.
Urgency
Remediation is critical as the vulnerability is actively exploited and poses severe risks.
Action
Update to the latest version of Log4j2 to mitigate the vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2023-05-01
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-45046

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-45046coverage & exploitation statusNVD · CVE.org

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