CVE-2021-44832: Apache Log4j2 vulnerable to RCE via JDBC Appender when attacker controls configuration
- Is it exploited?
Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .
VulnCheck KEV lists it since . It cites 7 public reports, the first from .
- How likely is exploitation in the next 30 days?
- 97.9%
EPSS score, percentile 99.9 of all scored records. A probability estimated by FIRST, not a report of exploitation.
- How severe?
- 6.6 Medium
CVSS v3.1 base score, from CISA's enrichment of the record
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
- Which versions are affected?
Affected
- from log4j-core to before 2.17.1
- from 2.13.0
- from 2.4
- from 2.0-beta7
Unaffected from 2.12.4; from 2.3.2
Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
Description
Apache Log4j2 vulnerable to RCE via JDBC Appender when attacker controls configuration
Apache Log4j2 versions 2.0-beta7 through 2.17.0 (excluding security fix releases 2.3.2 and 2.12.4) are vulnerable to a remote code execution (RCE) attack when a configuration uses a JDBC Appender with a JNDI LDAP data source URI when an attacker has control of the target LDAP server. This issue is fixed by limiting JNDI data source names to the java protocol in Log4j2 versions 2.17.1, 2.12.4, and 2.3.2.
Source: CVE List, as of . About the data.
What to do
Advisories and patches
- 20211210 Vulnerabilities in Apache Log4j Library Affecting Cisco Products: December 2021
- FEDORA-2021-c6f471ce0f
- FEDORA-2021-1bd9151bab
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
Versions by product, as listed in the CVE record (1 product)
| Status | Versions |
|---|---|
| Affected | from log4j-core to before 2.17.1 |
| Affected | from 2.13.0 |
| Unaffected | from 2.12.4 |
| Affected | from 2.4 |
| Unaffected | from 2.3.2 |
| Affected | from 2.0-beta7 |
Versions the record lists as unaffected: 2.12.4, 2.3.2.
Source: CVE List, as of . About the data.
Weakness
CWE-20, CWE-74
- CWE-20: Improper Input Validation
- CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| CVE record last updated |
References
9
- lists.apache.org
- issues.apache.org
- [oss-security] 20211228 CVE-2021-44832: Apache Log4j2 vulnerable to RCE via JDBC Appender when attacker controls configuration
- [debian-lts-announce] 20211229 [SECURITY] [DLA 2870-1] apache-log4j2 security update
- cert-portal.siemens.com
- oracle.com
- security.netapp.com
- oracle.com
- oracle.com
Known exploited Apache vulnerabilities
- CVE-2016-3081: Apache Struts Command Injection Vulnerability
- CVE-2026-34486: Apache Tomcat Missing Encryption of Sensitive Data Vulnerability
- CVE-2026-34197: Apache ActiveMQ Improper Input Validation Vulnerability
- CVE-2024-38475: Apache HTTP Server Improper Escaping of Output Vulnerability
- CVE-2025-24813: Apache Tomcat Path Equivalence Vulnerability