CVE-2025-59668VulnerabilityPublished 30 Sep 2025Updated 31 Oct 2025

CVE-2025-59668: NIHON KOHDEN Central Monitor CNS-6201 · NULL pointer dereference

Affects NIHON KOHDEN Central Monitor CNS-6201Source CVE Database V5

Not known to be exploited · CVSS 7.5 High.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.0 base score

7.5High

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

EPSS: 0.4% chance of exploitation in 30 days – higher than 40% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.0/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 30 Sep 2025
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 2026-10-25.

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

Affected software

Product	Affected	Fixed in
NIHON KOHDEN CORPORATION Central Monitor CNS-6201	Affected =01-03 =01-04 =01-05 =01-06 =02-10 =02-11	Fixed in–

AI-suggested

1. Apply official patches or firmware updates from NIHON KOHDEN CORPORATION as soon as they become available to address the NULL pointer dereference vulnerability directly. 2. Implement strict network segmentation to isolate CNS-6201 devices from general network traffic, limiting exposure to untrusted sources. 3. Deploy firewall rules or intrusion prevention systems (IPS) to block or filter unexpected or malformed UDP packets targeting the devices, especially from external or untrusted networks. 4. Monitor network traffic for unusual UDP packet patterns that could indicate exploitation attempts. 5. Restrict remote access to the devices to authorized personnel only, using VPNs or secure management channels. 6. Conduct regular security assessments and vulnerability scans on medical device networks to identify and remediate exposures. 7. Develop incident response plans specific to medical device availability issues to ensure rapid recovery and continuity of patient monitoring. 8. Coordinate with device vendors and healthcare cybersecurity teams to stay informed about updates and advisories related to this vulnerability.

Description

Multiple versions of Central Monitor CNS-6201 contain a NULL pointer dereference vulnerability. When processing a crafted certain UDP packet, the affected device may abnormally terminate.

Impact

The primary impact of CVE-2025-59668 is a denial-of-service condition that disrupts the availability of the Central Monitor CNS-6201 devices. For European healthcare organizations, this can translate into critical interruptions in patient monitoring, potentially delaying medical responses and jeopardizing patient safety. Hospitals and clinics relying on these devices may experience operational downtime, increased workload on medical staff, and the need for manual monitoring alternatives. Although the vulnerability does not affect confidentiality or integrity, the loss of availability in medical monitoring equipment is a significant risk in clinical environments. Additionally, the remote and unauthenticated nature of the exploit increases the threat surface, especially if the devices are accessible from less secure network segments or exposed to the internet. The absence of known exploits in the wild reduces immediate risk but does not eliminate the potential for future attacks. European healthcare providers must consider the impact on compliance with medical device regulations and patient safety standards, which mandate high availability and reliability of such equipment.

References

Community reviews

Loading reviews…