UpHeron
All vulnerabilities

Servers and applications

CVE-2021-45046

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…

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 1 May 2023.

Severity
Critical 9.0
Published
14 Dec 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
2.12.2, 2.16.0
Sources
NVD

Affected software

SoftwareAffected versions
Apache Log4jServers and applications · cpe:a:apache:log4j
  • Version 2.0-beta9
  • Version 2.0-rc1
  • Version 2.0-rc2
  • Version 2.0
  • From 2.0.1 before 2.12.2
  • From 2.13.0 before 2.16.0

Known exploited

CISA name
Apache Log4j2 Deserialization of Untrusted Data Vulnerability
Required action
Apply updates per vendor instructions.
Due for US agencies
22 May 2023
Used in ransomware
Yes, known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-45046
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-45046