CVE-2021-44832

CVE-2021-44832 is a medium-severity vulnerability in Apache Log4j with a CVSS 3.x base score of 6.6. Its EPSS exploit-prediction score of 98% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

• Severity: Medium (CVSS 3.x base score 6.6)
• CVSS v2: 8.5
• EPSS exploit prediction: 98% (100th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-20
• Affected product: Apache Log4j
• Published: 2021-12-28
• Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-44832?

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.

How severe is CVE-2021-44832?

CVE-2021-44832 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-44832 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 98% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-44832?

CVE-2021-44832 primarily affects Apache Log4j. In total, 47 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-44832?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-44832 published?

CVE-2021-44832 was published on 2021-12-28 and last updated on 2026-06-17.

References

• http://www.openwall.com/lists/oss-security/2021/12/28/1
• https://cert-portal.siemens.com/productcert/pdf/ssa-784507.pdf
• https://issues.apache.org/jira/browse/LOG4J2-3293
• https://lists.apache.org/thread/s1o5vlo78ypqxnzn6p8zf6t9shtq5143
• https://lists.debian.org/debian-lts-announce/2021/12/msg00036.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EVV25FXL4FU5X6X5BSL7RLQ7T6F65MRA/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T57MPJUW3MA6QGWZRTMCHHMMPQNVKGFC/
• https://security.netapp.com/advisory/ntap-20220104-0001/
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpujan2022.html
• https://www.oracle.com/security-alerts/cpujul2022.html

Affected products (47)

• cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:*
• cpe:2.3:a:apache:log4j:2.0:-:*:*:*:*:*:*
• cpe:2.3:a:apache:log4j:2.0:beta7:*:*:*:*:*:*
• cpe:2.3:a:apache:log4j:2.0:beta8:*:*:*:*:*:*
• cpe:2.3:a:apache:log4j:2.0:beta9:*:*:*:*:*:*
• cpe:2.3:a:apache:log4j:2.0:rc1:*:*:*:*:*:*
• cpe:2.3:a:apache:log4j:2.0:rc2:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_diameter_signaling_router:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_interactive_session_recorder:6.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_interactive_session_recorder:6.4:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_gateway:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_gateway:21.12.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_p6_enterprise_project_portfolio_management:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_p6_enterprise_project_portfolio_management:21.12.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_unifier:18.8:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_unifier:19.12:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_unifier:20.12:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:primavera_unifier:21.12:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:retail_assortment_planning:16.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:retail_fiscal_management:14.2:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:siebel_ui_framework:21.12:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:weblogic_server:12.2.1.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:weblogic_server:12.2.1.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:weblogic_server:14.1.1.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:cloudcenter:4.10.0.16:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_brm_-_elastic_charging_engine:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_brm_-_elastic_charging_engine:12.0.0.5.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_offline_mediation_controller:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:communications_offline_mediation_controller:12.0.0.5.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:flexcube_private_banking:12.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:health_sciences_data_management_workbench:2.5.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:health_sciences_data_management_workbench:3.0.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:health_sciences_data_management_workbench:3.1.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:policy_automation:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:policy_automation_for_mobile_devices:*:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:product_lifecycle_analytics:3.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:retail_order_broker:18.0:*:*:*:*:*:*:*

More vulnerabilities in Apache Log4j

• CVE-2021-44228 — Critical (CVSS 10.0): 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…
• CVE-2022-23305 — Critical (CVSS 9.8): By design, the JDBCAppender in Log4j 1.2.x accepts an SQL statement as a configuration parameter where the values to be…
• CVE-2020-9493 — Critical (CVSS 9.8): A deserialization flaw was found in Apache Chainsaw versions prior to 2.1.0 which could lead to malicious code…
• CVE-2019-17571 — Critical (CVSS 9.8): Included in Log4j 1.2 is a SocketServer class that is vulnerable to deserialization of untrusted data which can be…
• CVE-2017-5645 — Critical (CVSS 9.8): In Apache Log4j 2.x before 2.8.2, when using the TCP socket server or UDP socket server to receive serialized log…
• CVE-2021-45046 — Critical (CVSS 9.0): It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default…

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