CVE-2025-29918

Packet-processing hang via repeated negated PCRE evaluation

Published Apr 10, 2025 · Updated Nov 3, 2025

An infinite loop in Suricata before 7.0.9 allows local users to hang a packet-processing thread with a crafted negated PCRE rule. DetectEngineContentInspectionInternal retries a negated expression as though it could yield another occurrence instead of terminating after its single valid attempt. Exploitation requires loading the crafted rule; a triggered thread then stops processing packets, reducing monitoring visibility and inline availability.

CVSS severity6.2
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An infinite loop in Suricata before 7.0.9 allows local users to hang a packet-processing thread with a crafted negated PCRE rule. DetectEngineContentInspectionInternal retries a negated expression as though it could yield another occurrence instead of terminating after its single valid attempt. Exploitation requires loading the crafted rule; a triggered thread then stops processing packets, reducing monitoring visibility and inline availability.

The record

CVE
CVE-2025-29918
Published
Apr 10, 2025
Updated
Nov 3, 2025
Vendor
Open Information Security Foundation
Product
Suricata
Classifications
CWE-835, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 7.0.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Open Information Security Foundation · Suricataversion=< 7.0.9

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.2GitHub, Inc.CVSS:3.1/AV:L/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Application or System Exploitation DoS

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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