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Vulnerability record · CVE-2023-26464 · published 10 March 2023

CVE-2023-26464: Apache log4j deserialization of untrusted data vulnerability

Apache · Log4j

** UNSUPPORTED WHEN ASSIGNED ** When using the Chainsaw or SocketAppender components with Log4j 1.x on JRE less than 1.7, an attacker that manages to cause a logging entry involving a specially-crafted (ie, deeply nested) hashmap or hashtable (depending on which logging component is in use) to be processed could exhaust the available memory in the virtual machine and achieve Denial of Service when the object is deserialized. This issue affects Apache Log4j before 2. Affected users are recommended to update to Log4j 2.x. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

7.5 CVSS 3.1 High EPSS 1.9% · top 21.1% CWE-502 · Deserialization of untrusted data
7.5CVSS 3.1 base score
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

** UNSUPPORTED WHEN ASSIGNED ** When using the Chainsaw or SocketAppender components with Log4j 1.x on JRE less than 1.7, an attacker that manages to cause a logging entry involving a specially-crafted (ie, deeply nested) hashmap or hashtable (depending on which logging component is in use) to be processed could exhaust the available memory in the virtual machine and achieve Denial of Service when the object is deserialized. This issue affects Apache Log4j before 2. Affected users are recommended to update to Log4j 2.x. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread/wkx6grrcjkh86crr49p4blc1v1nflj3t Mailing List
https://security.netapp.com/advisory/ntap-20230505-0008/
https://lists.apache.org/thread/wkx6grrcjkh86crr49p4blc1v1nflj3t Mailing List
https://security.netapp.com/advisory/ntap-20230505-0008/

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2021-44228Apache Log4j2 JNDI lookup remote code executionApache Log4j2 versions 2.0-beta9 through 2.15.0 (excluding 2.12.2, 2.12.3, and 2.3.1) do not protect against attacker-controlled LDAP and other JNDI …KEVEPSS 100%analysed9.0CVE-2021-45046Apache Log4j 2.15.0 Incomplete Fix Allows JNDI Lookup InjectionThe fix for CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. When a non-default Pattern Layout uses a Cont…KEVEPSS 100%analysed9.8CVE-2022-23305Log4j 1.x JDBCAppender SQL injection via logged inputThe JDBCAppender in Log4j 1.2.x builds SQL statements from configuration parameters and PatternLayout converters, so logged values such as the %m mes…EPSS 67%analysed9.8CVE-2020-9493Apache chainsaw deserialization of untrusted data vulnerabilityA deserialization flaw was found in Apache Chainsaw versions prior to 2.1.0 which could lead to malicious code execution.EPSS 4.6%9.8CVE-2019-17571Apache Log4j 1.2 SocketServer Deserialization RCELog4j 1.2 includes a SocketServer class that deserializes untrusted data received over the network. When a deserialization gadget is present on the c…EPSS 69%analysed9.8CVE-2017-5645Apache Log4j 2 socket server deserialization allows remote code executionApache Log4j 2.x before 2.8.2 deserializes binary log events received over its TCP or UDP socket server without validating the payload. A crafted ser…EPSS 90%analysed8.8CVE-2022-23302Apache Log4j 1.x JMSSink JNDI deserialization remote code executionJMSSink in all versions of Log4j 1.x deserializes untrusted data when an attacker can write to the Log4j configuration or when the configuration refe…EPSS 64%analysed8.8CVE-2022-23307Apache Chainsaw and Log4j 1.2.x Deserialization of Untrusted DataCVE-2022-23307 is a deserialization of untrusted data flaw (CWE-502) that was originally identified in Apache Chainsaw as CVE-2020-9493. The same iss…EPSS 54%analysed

Source: NIST National Vulnerability Database (record CVE-2023-26464), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.