Exploited· due 2021-12-2410.0criticalCriticalused in ransomware

CVE-2021-44228

Siemens 6bk1602-0aa12-0tp0 Firmware

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.

Exploitation status

CISA has confirmed this is being exploited in the wild. That is an observation of real attacks, not a prediction.
It is known to have been used in ransomware campaigns.
US federal civilian agencies are required to remediate it by 2021-12-24. That deadline does not bind private companies, but it is a reasonable benchmark for how urgently CISA views it.
A vendor advisory or patch reference has been published.

Required action

For all affected software assets for which updates exist, the only acceptable remediation actions are: 1) Apply updates; OR 2) remove affected assets from agency networks. Temporary mitigations using one of the measures provided at https://www.cisa.gov/uscert/ed-22-02-apache-log4j-recommended-mitigation-measures are only acceptable until updates are available.

CISA’s wording, unedited.

What the metrics mean

It is reachable over a network, without needing local access.
For an attacker who can reach it, no special conditions are needed to exploit it.
To exploit it, no account is needed.
Beyond that, no action by a user is required.

Scoring

CVSS: 10.0 (v3.1)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-20
Assigned by: security@apache.org

Dates

Published: 2021-12-10
Last modified: 2026-08-11
Added to KEV: 2021-12-10
Remediation due: 2021-12-24
Sources: CISA KEV, NVD

Affected products

Siemens 6bk1602-0aa12-0tp0 Firmware- 2.7.0
Siemens 6bk1602-0aa12-0tp0all versions
Siemens 6bk1602-0aa22-0tp0 Firmware- 2.7.0
Siemens 6bk1602-0aa22-0tp0all versions
Siemens 6bk1602-0aa32-0tp0 Firmware- 2.7.0
Siemens 6bk1602-0aa32-0tp0all versions
Siemens 6bk1602-0aa42-0tp0 Firmware- 2.7.0
Siemens 6bk1602-0aa42-0tp0all versions
Siemens 6bk1602-0aa52-0tp0 Firmware- 2.7.0
Siemens 6bk1602-0aa52-0tp0all versions
Apache Log4j2.0.1 - 2.3.1, 2.4.0 - 2.12.2, 2.13.0 - 2.15.0, 2.0
Siemens Sppa-T3000 Ses3000 Firmwareall versions

As listed in the NVD configuration data. Not a statement about your estate.