CVE-2023-26464

Apache Log4j 1.x (EOL) allows DoS in Chainsaw and SocketAppender

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.08%
Vendor Advisory apache.org
Affected: Apache Software Foundation Apache Log4j
Published at:
Updated at:

References

Link Tags
https://lists.apache.org/thread/wkx6grrcjkh86crr49p4blc1v1nflj3t mailing list vendor advisory
https://security.netapp.com/advisory/ntap-20230505-0008/

Frequently Asked Questions

What is the severity of CVE-2023-26464?
CVE-2023-26464 has been scored as a high severity vulnerability.
How to fix CVE-2023-26464?
To fix CVE-2023-26464, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-26464 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-26464 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-26464?
CVE-2023-26464 affects Apache Software Foundation Apache Log4j.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.