CVE-2022-38725Network attack vector

Unauthenticated log-processing halt via RFC3164 parser underflow

Published Jan 23, 2023 · Updated Apr 3, 2025

Denial of service in One Identity syslog-ng products allows remote attackers to halt log processing through crafted RFC3164 input. The RFC3164 syslog and timestamp parsers mishandle buffer bounds, triggering integer wraparound that leaves a worker thread spinning at 100% CPU. Exposure requires a tcp() or network() source that accepts RFC3164 messages; repeated inputs can exhaust every worker and stop log delivery.

CVSS severity7.5
High
EPSS probability2.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in One Identity syslog-ng products allows remote attackers to halt log processing through crafted RFC3164 input. The RFC3164 syslog and timestamp parsers mishandle buffer bounds, triggering integer wraparound that leaves a worker thread spinning at 100% CPU. Exposure requires a tcp() or network() source that accepts RFC3164 messages; repeated inputs can exhaust every worker and stop log delivery.

The record

CVE
CVE-2022-38725
Published
Jan 23, 2023
Updated
Apr 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-191, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499.004Application or System Exploitation

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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