CVE-2024-39589VulnerabilityPublished 18 Sep 2024Updated 4 Nov 2025

CVE-2024-39589: OpenPLC_v3 · Incorrect Type Conversion or Cast

Affects OpenPLC_v3Source CVE Database V5

Not known to be exploited · CVSS 7.5 High.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

7.5High

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

EPSS: 1.0% chance of exploitation in 30 days – higher than 63% 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 18 Sep 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 2026-10-26.

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 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

AI-suggested

To mitigate CVE-2024-39589, organizations should implement the following specific measures: 1) Monitor and restrict EtherNet/IP traffic to only trusted devices and networks using industrial firewalls and network segmentation to limit exposure. 2) Employ deep packet inspection tools capable of analyzing EtherNet/IP protocol traffic to detect anomalous or malformed requests indicative of exploitation attempts. 4) Conduct thorough input validation and fuzz testing on EtherNet/IP parser components in custom or extended OpenPLC deployments to identify and remediate similar issues proactively. 5) Implement redundancy and failover mechanisms in critical control systems to minimize operational impact from potential DoS events. 6) Train ICS security teams to recognize signs of network-based DoS attacks targeting EtherNet/IP and respond promptly. 7) Maintain an inventory of all OpenPLC instances and their versions to prioritize remediation efforts. These steps go beyond generic advice by focusing on protocol-specific controls, network-level defenses, and operational continuity planning tailored to the industrial environment.

Description

Multiple invalid pointer dereference vulnerabilities exist in the OpenPLC Runtime EtherNet/IP parser functionality of OpenPLC_v3 16bf8bac1a36d95b73e7b8722d0edb8b9c5bb56a. A specially crafted EtherNet/IP request can lead to denial of service. An attacker can send a series of EtherNet/IP requests to trigger these vulnerabilities.This instance of the vulnerability occurs within the `Protected_Logical_Read_Reply` function

Impact

For European organizations, the primary impact of CVE-2024-39589 is the potential denial of service of industrial control systems running OpenPLC_v3. This can lead to operational disruptions in manufacturing, energy production, water treatment, and other critical infrastructure sectors. The loss of availability in these systems can cause production halts, safety system failures, and financial losses. Given the increasing digitization and network connectivity of industrial environments in Europe, the attack surface is expanding, making such vulnerabilities more consequential. Additionally, disruption in critical infrastructure can have cascading effects on supply chains and public services. Since the vulnerability does not affect confidentiality or integrity, data theft or manipulation is not a direct concern; however, the operational impact alone is significant. The lack of required authentication and user interaction means attackers can exploit this remotely over the network, increasing the risk. European organizations with limited network segmentation or insufficient monitoring of EtherNet/IP traffic are particularly vulnerable.

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 4 Nov 2025, 17:14 UTC

WeaknessesCWE-704

Technical details

References

Community reviews

Related threats