CVE-2021-44832Network attack vector

Code execution via unrestricted JDBC Appender JNDI lookup

Published Dec 28, 2021 · Updated May 29, 2026

Remote code execution in Apache Log4j 2 2.0-beta7 through 2.17.0 allows attackers with configuration write access to run code. DataSourceConnectionSource passes the configured JNDI name directly to InitialContext.lookup, allowing an LDAP URI to resolve an attacker-controlled data source and load code. Exploitation requires write access to the non-default JDBC Appender configuration and control of its LDAP endpoint; 2.3.2 and 2.12.4 are excluded from the affected span.

CVSS severity6.6
Medium
EPSS probability97.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Apache Log4j 2 2.0-beta7 through 2.17.0 allows attackers with configuration write access to run code. DataSourceConnectionSource passes the configured JNDI name directly to InitialContext.lookup, allowing an LDAP URI to resolve an attacker-controlled data source and load code. Exploitation requires write access to the non-default JDBC Appender configuration and control of its LDAP endpoint; 2.3.2 and 2.12.4 are excluded from the affected span.

The record

CVE
CVE-2021-44832
Published
Dec 28, 2021
Updated
May 29, 2026
Vendor
Apache Software Foundation
Product
Apache Log4j 2
Classifications
CWE-20, CWE-74
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 28, 2021CVE publishedPublication date reported by the CVE source.
  2. May 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=log4j-core <2.17.1 changes=[{"at":"2.13.0","status":"affected"},{"at":"2.12.4","status":"unaffected"},{"at":"2.4","status":"affected"},{"at":"2.3.2","status":"unaffected"},{"at":"2.0-beta7","status":"affected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Apache Software Foundation · Apache Log4j 2version=log4j-core <2.17.1 changes=[{"at":"2.13.0","status":"affected"},{"at":"2.12.4","status":"unaffected"},{"at":"2.4","status":"affected"},{"at":"2.3.2","status":"unaffected"},{"at":"2.0-beta7","status":"affected"}]

Published CVSS scores

6.6CISA-ADPCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
6.6NIST NVDCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
6.6Apache Software FoundationCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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