CVE-2021-44832
Apache Log4j2 vulnerable to RCE via JDBC Appender when attacker controls configuration
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
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.
Official description from the CVE record, published by apache. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org
Key data
CVSS 3.1 Medium 6.6
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: High
The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required: High
An account with significant privileges, such as an administrator, is needed.
User interaction: None
No action from any user is needed.
Scope: Unchanged
The impact stays within the vulnerable component.
Confidentiality impact: High
Serious or total effect on the secrecy of data.
Integrity impact: High
Serious or total effect on the trustworthiness of data.
Availability impact: High
Serious or total effect on availability.
| Metric | Value | What it means |
|---|---|---|
| Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. |
| Attack complexity | High | The attack depends on conditions outside the attacker's control, so it takes preparation. |
| Privileges required | High | An account with significant privileges, such as an administrator, is needed. |
| User interaction | None | No action from any user is needed. |
| Scope | Unchanged | The impact stays within the vulnerable component. |
| Confidentiality impact | High | Serious or total effect on the secrecy of data. |
| Integrity impact | High | Serious or total effect on the trustworthiness of data. |
| Availability impact | High | Serious or total effect on availability. |
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EPSS
- Score
- 0.97906 (97.9% probability)
- Percentile
- 99.9%
- Scores of
- Nov 10, 2026
- Model
- v2026.06.15
CISA assessment as of May 29, 2026
- Automatable
- no
- Technical impact
- total
Weakness (CWE)
Affected products
Apache Log4j2
- affected: log4j-core up to before 2.17.1
References
- 20211210 Vulnerabilities in Apache Log4j Library Affecting Cisco Products: December 2021 (tools.cisco.com)vendor-advisory
- lists.apache.org/thread/s1o5vlo78ypqxnzn6p8zf6t9shtq5143
- issues.apache.org/jira/browse/LOG4J2-3293
- [oss-security] 20211228 CVE-2021-44832: Apache Log4j2 vulnerable to RCE via JDBC Appender when attacker controls configuration (openwall.com)mailing-list
- [debian-lts-announce] 20211229 [SECURITY] [DLA 2870-1] apache-log4j2 security update (lists.debian.org)mailing-list
- cert-portal.siemens.com/productcert/pdf/ssa-784507.pdf
- FEDORA-2021-c6f471ce0f (lists.fedoraproject.org)vendor-advisory
- FEDORA-2021-1bd9151bab (lists.fedoraproject.org)vendor-advisory
- oracle.com/security-alerts/cpujan2022.html
- security.netapp.com/advisory/ntap-20220104-0001
- oracle.com/security-alerts/cpuapr2022.html
- oracle.com/security-alerts/cpujul2022.html
Timeline
- ID reserved
- Record published
- Record last updated
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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:51 UTC. Sources and licenses