CVE intelligence and bounded remediation

CVE-2021-44228 — Apache Log4j2 Remote Code Execution Vulnerability

Critical CVSS 10 CISA KEV

Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled. From log4j 2.15.0, this behavior has been disabled by default. From version 2.16.0 (along with 2.12.2, 2.12.3, and 2.3.1), this functionality has been completely removed. Note that this vulnerability is specific to log4j-core and does not affect log4net, log4cxx, or other Apache Logging Services projects.

Severity
Critical
CVSS
10 (3.1)
Published
2021-12-10
CISA KEV
Known exploited
Ecosystem
java/maven
Weaknesses
CWE-20, CWE-400, CWE-502, CWE-917

Affected products

  • siemens / 6bk1602-0aa12-0tp0_firmware
  • siemens / 6bk1602-0aa22-0tp0_firmware
  • siemens / 6bk1602-0aa32-0tp0_firmware
  • siemens / 6bk1602-0aa42-0tp0_firmware
  • siemens / 6bk1602-0aa52-0tp0_firmware
  • apache / log4j

Showing 6 representative product identities from 373 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Command, code, expression, and template injection

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Check exposure

  • Trace untrusted values to process execution, interpreters, evaluators, template engines, dynamic imports, and administrative scripting features.
  • Determine whether the affected path is reachable across each trust boundary and which service account or host privilege it inherits.
  • Review configuration for optional execution features, unsafe compatibility modes, and shell invocation.

Remediate safely

  • Replace string-built commands or evaluated code with fixed operations and structured argument APIs that do not invoke a shell.
  • Use strict allowlists for operation identifiers and reject unexpected input before it reaches any interpreter.
  • Update the affected component and add inert regression tests covering metacharacters, encoding variants, and alternate request paths.

Authoritative sources

Complete CVE record and remediation plan

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