CVE-2025-43879VulnerabilityPublished 24 Jun 2025Updated 26 Jun 2025

CVE-2025-43879: ELECOM WRH-733GBK · OS Command Injection

Affects ELECOM WRH-733GBKSource CVE Database V5

Not known to be exploited · CVSS 9.8 Critical.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.0 base score

9.8Critical

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

EPSS: 2.1% chance of exploitation in 30 days – higher than 82% 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:H/I:H/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
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: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to 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 24 Jun 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
ELECOM CO.,LTD. WRH-733GBK	Affected *	Fixed in–

AI-suggested

Immediate mitigation steps should include isolating affected WRH-733GBK and WRH-733GWH devices from untrusted networks, especially disabling telnet access from external or untrusted sources. Network segmentation should be enforced to limit the exposure of these devices. Organizations should monitor network traffic for unusual telnet activity and implement intrusion detection systems with signatures targeting command injection attempts. Since no official patches are currently available, consider replacing vulnerable devices with updated hardware or firmware from ELECOM or alternative vendors. If telnet functionality is not essential, it should be disabled entirely. Additionally, implement strict access control policies and network-level filtering to restrict access to management interfaces. Regularly review vendor communications for patch releases and apply updates promptly once available. Conduct thorough audits of network devices to identify any signs of compromise related to this vulnerability.

Description

WRH-733GBK and WRH-733GWH contain an improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability in the telnet function. If a remote unauthenticated attacker sends a specially crafted request to the affected product, an arbitrary OS command may be executed.

Impact

For European organizations, exploitation of this vulnerability could result in severe operational disruptions and data breaches. Given that the affected devices are network hardware, attackers could gain persistent access to internal networks, intercept or manipulate sensitive communications, and disrupt network availability. This could impact sectors reliant on stable network infrastructure such as manufacturing, telecommunications, healthcare, and critical infrastructure. The ability to execute arbitrary OS commands remotely without authentication means attackers could deploy malware, establish backdoors, or exfiltrate confidential data. The compromise of such devices could also undermine trust in supply chain security and lead to regulatory penalties under GDPR if personal data is exposed. Additionally, the vulnerability could be leveraged in targeted attacks against high-value European organizations or critical infrastructure, amplifying geopolitical risks.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 24 Jun 2025, 05:10 UTC

Technical details

References

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