Vulnerability

CVE-2021-44228

CRITICAL 10.0 exploited in the wild (CISA KEV) public exploits (10)

CVE-2021-44228 is a critical-severity vulnerability (CVSS v3.1 10.0) known to be exploited in the wild. As of 2026-10-05, no host in our data shows software it affects on an open port.

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.

Published: 2021-12-10
Last modified: 2026-08-13
CVSS score: 10.0 CVSS v3.1
CVSS vector (v3.1): CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploit likelihood (EPSS): 100.0% in the next 30 days (higher than 100% of CVEs)

Exposure in our data

0 hosts

Hosts whose banner shows an affected software version on a port open at their latest check.

Counted 2026-10-05 02:21 UTC

By country

Not seen on any scanned host.

Affected software seen

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