CVE-2023-42463

Local privilege escalation via unchecked multiline separator

Published Jan 12, 2024 · Updated Oct 24, 2024

Stack-based buffer overflow in Wazuh logcollector before 4.5.3 allows local users to escalate privileges through multiline log input. The multiline reader checks space before appending each line but writes an intervening whitespace separator without checking the destination buffer boundary. Exploitation requires multiline log collection and carefully sized local log data; successful stack corruption grants elevated privileges.

CVSS severity7.4
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Wazuh logcollector before 4.5.3 allows local users to escalate privileges through multiline log input. The multiline reader checks space before appending each line but writes an intervening whitespace separator without checking the destination buffer boundary. Exploitation requires multiline log collection and carefully sized local log data; successful stack corruption grants elevated privileges.

The record

CVE
CVE-2023-42463
Published
Jan 12, 2024
Updated
Oct 24, 2024
Vendor
Wazuh
Product
Wazuh
Classifications
CWE-121, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 24, 2024Record 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=< 4.5.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Wazuh · Wazuhversion=< 4.5.3

Published CVSS scores

7.4GitHub CNACVSS:3.1/AV:L/AC:H/PR:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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