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CVE-2023-26464

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

HIGH
7.5
CVSS Score
Published: March 10, 2023 at 01:38 PM UTC
Updated: June 17, 2026 at 05:43 AM UTC
1 product affected across 1 vendorLog4j

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Log4j· Apachemaven
95%
1.0.4 ≤ v < 21.0.4
Vendor states this is fixed in 2 (unaffected)
Affected range stops below 2.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor AdvisoryMailing List
Source: [email protected]
https://lists.apache.org/thread/wkx6grrcjkh86crr49p4blc1v1nflj3t
Source: [email protected]
https://security.netapp.com/advisory/ntap-20230505-0008/

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-502

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