VulnerabilityPublished 2 Jun 2025

CVE-2025-5440: Linksys RE6500 · OS Command Injection

Affects Linksys RE6500Source CVE Database V5

Not known to be exploited · CVSS 5.3 Medium.

Data as of 26 Oct 2026, 10:12 UTC

CVSS 4.0 base score

5.3Medium

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

EPSS: 5.0% chance of exploitation in 30 days – higher than 92% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

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

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, 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: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 2 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 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
Linksys RE6500	Affected 1.0.04.001 – 1.2.07.001 5 affected builds	Fixed in–

AI-suggested

Given the absence of official patches, European organizations should immediately audit their network for the presence of affected Linksys range extender models and firmware versions. Network segmentation should be enforced to isolate these devices from critical infrastructure and sensitive data environments. Disabling the NTP manual configuration interface or restricting access to the /goform/NTP endpoint via firewall rules or access control lists can reduce exposure. Employing network intrusion detection systems (NIDS) to monitor for suspicious command injection patterns targeting these parameters is advisable. Organizations should consider replacing vulnerable devices with updated models or alternative vendors that provide timely security updates. Additionally, implementing strict network monitoring and anomaly detection can help identify exploitation attempts. Regular firmware integrity checks and limiting administrative access to trusted personnel only are recommended. Finally, organizations should maintain an incident response plan tailored to network device compromise scenarios.

Description

A vulnerability classified as critical has been found in Linksys RE6500, RE6250, RE6300, RE6350, RE7000 and RE9000 1.0.013.001/1.0.04.001/1.0.04.002/1.1.05.003/1.2.07.001. This affects the function NTP of the file /goform/NTP. The manipulation of the argument manual_year_select/manual_month_select/manual_day_select/manual_hour_select/manual_min_select/manual_sec_select leads to os command injection. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Impact

For European organizations, this vulnerability poses a tangible risk, especially for enterprises and service providers relying on Linksys range extenders to enhance wireless coverage. Exploitation could lead to unauthorized control over network infrastructure components, enabling attackers to intercept, manipulate, or disrupt internal communications. This is particularly critical in sectors with stringent data protection requirements such as finance, healthcare, and government agencies. Compromised devices could serve as entry points for lateral movement within corporate networks or as platforms for launching further attacks. Additionally, the lack of vendor response and patches increases the window of exposure. Small and medium enterprises (SMEs) that often deploy consumer-grade networking equipment without rigorous security management are especially vulnerable. The potential for disruption of network availability and confidentiality breaches could lead to regulatory non-compliance under GDPR and other European cybersecurity frameworks.

Summary

CVE-2025-5440 is a medium-severity OS command injection vulnerability affecting multiple Linksys range extender models, including RE6500, RE6250, RE6300, RE6350, RE7000, and RE9000, specifically in firmware versions 1.0.013.001, 1.0.04.001, 1.0.04.002, 1.1.05.003, and 1.2.07.001. The vulnerability resides in the NTP (Network Time Protocol) functionality, particularly in the /goform/NTP endpoint. The issue arises from improper sanitization of several parameters related to manual time setting: manual_year_select, manual_month_select, manual_day_select, manual_hour_select, manual_min_select, and manual_sec_select. An attacker can manipulate these parameters to inject arbitrary OS commands, which the device executes with elevated privileges. This flaw allows remote attackers to execute arbitrary commands without authentication or user interaction, increasing the attack surface significantly. The CVSS v4.0 base score is 5.3, reflecting a medium severity primarily due to the requirement of low privileges and the limited scope of impact. The vulnerability could enable attackers to compromise device integrity, potentially leading to persistent backdoors, network pivoting, or denial of service by disrupting device operations.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 9 Jul 2025, 12:55 UTC

Technical details

References

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