CVE-2024-28732Public exploitNetwork attack vector

Controller hang via zero-length OpenFlow instruction

Published Apr 8, 2024 · Updated Aug 21, 2024

Infinite-loop denial of service in Faucet SDN Ryu 4.34 allows remote attackers to hang the controller with a crafted OpenFlow message. The referenced proof of concept locates the flaw in OFPFlowMod parsing: its loop adds untrusted OFPInstruction.len to the offset, and a zero value prevents progress. An unauthenticated peer able to reach the OpenFlow listener can stop controller processing without user interaction.

CVSS severity7.5
High
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Infinite-loop denial of service in Faucet SDN Ryu 4.34 allows remote attackers to hang the controller with a crafted OpenFlow message. The referenced proof of concept locates the flaw in OFPFlowMod parsing: its loop adds untrusted OFPInstruction.len to the offset, and a zero value prevents progress. An unauthenticated peer able to reach the OpenFlow listener can stop controller processing without user interaction.

The record

CVE
CVE-2024-28732
Published
Apr 8, 2024
Updated
Aug 21, 2024
Vendor
Faucet SDN
Product
Ryu
Classifications
CWE-835, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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=4.34

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Faucet SDN · Ryuversion=4.34

Published CVSS scores

7.5CISA-ADPCVSS: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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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