CVE-2024-37151Network attack vector

Policy bypass via completed defrag tracker reuse

Published Jul 11, 2024 · Updated Nov 3, 2025

Improper defragmentation in Suricata 6.0.0 through 6.0.19 and 7.0.0 through 7.0.5 allows remote attackers to bypass policy. DefragGetTrackerFromHash checks the remove flag only for the first tracker in a hash row, so a new fragmented packet can reuse a completed tracker with the same IP ID and fail reassembly. Exploitation requires tracker collisions and two quickly arriving fragmented packets with a reused IP ID; missed reassembly lets matching traffic evade IDS or IPS inspection.

CVSS severity5.3
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper defragmentation in Suricata 6.0.0 through 6.0.19 and 7.0.0 through 7.0.5 allows remote attackers to bypass policy. DefragGetTrackerFromHash checks the remove flag only for the first tracker in a hash row, so a new fragmented packet can reuse a completed tracker with the same IP ID and fail reassembly. Exploitation requires tracker collisions and two quickly arriving fragmented packets with a reused IP ID; missed reassembly lets matching traffic evade IDS or IPS inspection.

The record

CVE
CVE-2024-37151
Published
Jul 11, 2024
Updated
Nov 3, 2025
Vendor
Open Information Security Foundation
Product
Suricata
Classifications
CWE-754
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2024CVE 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=>= 6.0.0, < 6.0.20
  2. Affected versionversion=6.0.0 <6.0.20
  3. Affected versionversion=>= 7.0.0,< 7.0.6
  4. Affected versionversion=7.0.0 <7.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open Information Security Foundation · Suricataversion=>= 6.0.0, < 6.0.20; version=6.0.0 <6.0.20; version=>= 7.0.0,< 7.0.6; version=7.0.0 <7.0.6

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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-754Improper Check for Unusual or Exceptional Conditions

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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