CVE-2021-45046

Critical · CVSS 9EPSS 100.0%CISA KEVCWE-917

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

It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern resulting in an information leak and remote code execution in some environments and local code execution in all environments. Log4j 2.16.0 (Java 8) and 2.12.2 (Java 7) fix this issue by removing support for message lookup patterns and disabling JNDI functionality by default.

References

NVD MITRE CVE.org CISA KEV

Published Dec 14, 2021

Community ground truth

Community verdict

3 verdicts

Not a real issue

to add your verdict.

Community real-world severity: Critical (Critical 3) — CVSS base score 9

In line with its CVSS base score.

Field notes & remediation

Verdicts are the quick signal — notes are the evidence and fixes behind them.

No notes yet — be the first to share what you saw or a fix that worked.