CVE-2024-28870Network attack vector

Service interruption via quadratic SSH banner parsing

Published Apr 3, 2024 · Updated Aug 2, 2024

Resource exhaustion in Suricata 6.0.16 and earlier and 7.0.0 through 7.0.3 allows remote attackers to interrupt service via an oversized SSH banner. The SSH banner parser repeatedly reparses a growing incomplete identification line, producing quadratic CPU work, while long-banner events can flood EVE alert records. The path is reached when monitored traffic carries an SSH identification line beyond the 256-byte parser limit; no authentication or user interaction is required.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Suricata 6.0.16 and earlier and 7.0.0 through 7.0.3 allows remote attackers to interrupt service via an oversized SSH banner. The SSH banner parser repeatedly reparses a growing incomplete identification line, producing quadratic CPU work, while long-banner events can flood EVE alert records. The path is reached when monitored traffic carries an SSH identification line beyond the 256-byte parser limit; no authentication or user interaction is required.

The record

CVE
CVE-2024-28870
Published
Apr 3, 2024
Updated
Aug 2, 2024
Vendor
Open Information Security Foundation
Product
Suricata
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=0 <=6.0.16
  2. Affected versionversion=<= 6.0.16
  3. Affected versionversion=>= 7.0.0, <= 7.0.3
  4. Affected versionversion=7.0.0 <=7.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open Information Security Foundation · Suricataversion=0 <=6.0.16; version=<= 6.0.16; version=>= 7.0.0, <= 7.0.3; version=7.0.0 <=7.0.3

Published CVSS scores

7.5GitHub, Inc.CVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
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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