VulnerabilityPublished 8 Apr 2024Updated 21 Aug 2024

CVE-2024-28732: ryu · Infinite Loop

Affects ryuSource CVE Database V5

Not known to be exploited · CVSS 7.5 High.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.8% chance of exploitation in 30 days – higher than 56% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 8 Apr 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
GitHubfaucetsdn/ryu`pkg:github/faucetsdn/ryu`Other threats	Affected =4.34	Fixed in–

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AI-suggested

Until an official patch is released, organizations should implement network-level protections such as filtering and rate-limiting traffic to the SDN controller to reduce exposure to malicious input. Deploying intrusion detection or prevention systems (IDS/IPS) with signatures or heuristics to detect anomalous or malformed OFPMatch messages can help identify exploitation attempts. Network segmentation should isolate the SDN controller from untrusted networks to limit attack surface. Monitoring controller logs and resource usage for signs of infinite loops or unusual CPU spikes can provide early warning. Organizations should engage with the Faucet SDN community or vendor for updates and apply patches promptly once available. Additionally, conducting a thorough review of input validation and parser robustness in custom deployments may reduce risk. Employing redundancy and failover mechanisms for SDN controllers can mitigate availability impacts during an attack.

Description

An issue was discovered in OFPMatch in parser.py in Faucet SDN Ryu version 4.34, allows remote attackers to cause a denial of service (DoS) (infinite loop).

Impact

The primary impact of CVE-2024-28732 is denial of service against the Faucet SDN Ryu controller, which can disrupt network management and flow control in environments relying on this software. This disruption can lead to network outages, degraded performance, or loss of control over network traffic, affecting business continuity and operational stability. Organizations using Faucet SDN Ryu in critical infrastructure, data centers, or cloud environments may experience significant operational impact. The remote and unauthenticated nature of the exploit increases the risk of widespread attacks, especially if threat actors develop automated exploit tools. While confidentiality and integrity are not directly affected, the availability impact can cascade, causing indirect effects on dependent systems and services. The absence of patches increases exposure time, and the infinite loop can consume CPU and memory resources, potentially affecting other processes on the host system.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Feb 2026, 17:55 UTC

WeaknessesCWE-835

Technical details

References

Community reviews

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