VulnerabilityPublished 16 Dec 2025

CVE-2025-29231: Cross-site Scripting

Source CVE Database V5

Not known to be exploited · CVSS 6.1 Medium.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score

6.1Medium

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

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

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: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
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 impacted component.
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 on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Dec 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

AI-suggested

Immediately restrict access to the Linksys E5600 router management interface to trusted networks only, preferably via VPN or internal network segments.
Disable remote web management if not strictly necessary to reduce exposure.
Implement strict input validation and sanitization on the hostname and domainName parameters within the router firmware; if possible, update firmware once a patch is released.
Monitor router logs and network traffic for unusual activity or attempts to inject scripts.
Educate network administrators to avoid clicking on suspicious links or payloads that could trigger the stored XSS.
Use network segmentation to isolate critical devices and limit the impact of a compromised router.
Regularly audit and update router firmware to incorporate security patches as they become available.
Employ web application firewalls or intrusion detection systems to detect and block malicious payloads targeting router management interfaces.

Description

CVE-2025-29231 is a stored cross-site scripting (XSS) vulnerability found in the page_save component of Linksys E5600 routers, allowing attackers to inject malicious scripts via the hostname and domainName parameters. Exploitation requires no privileges but does need user interaction, such as an administrator visiting a crafted page. The vulnerability can lead to partial compromise of confidentiality and integrity by executing arbitrary web scripts in the context of the router's management interface. Although no known exploits are currently in the wild, the medium severity CVSS score of 6.1 reflects the potential risk. European organizations using Linksys E5600 routers should be aware of this risk, especially in environments where router management interfaces are accessible. Mitigation involves restricting access to router management interfaces, validating and sanitizing input parameters, and monitoring for suspicious activity. Countries with higher Linksys market penetration and critical infrastructure relying on these devices, such as Germany, France, and the UK, are more likely to be affected. This vulnerability does not impact availability but can facilitate further attacks if exploited.

Impact

For European organizations, the exploitation of this vulnerability could lead to unauthorized execution of scripts within the router's management interface, potentially exposing sensitive configuration data such as network settings, credentials, or session tokens. This could facilitate further attacks like network reconnaissance, man-in-the-middle attacks, or persistent access through compromised routers. While the vulnerability does not directly affect availability, the integrity and confidentiality of network management are at risk. Organizations with remote or web-accessible router management interfaces are particularly vulnerable. Given the widespread use of Linksys devices in both enterprise branch offices and home office environments across Europe, this vulnerability could be leveraged to target critical infrastructure, corporate networks, or teleworking setups. The medium severity indicates a moderate risk, but the potential for lateral movement and escalation within networks elevates the importance of addressing this issue promptly.

Summary

CVE-2025-29231 is a stored cross-site scripting (XSS) vulnerability identified in the page_save component of the Linksys E5600 router firmware version 1.1.0.26. The vulnerability arises because the hostname and domainName parameters are not properly sanitized before being stored and subsequently rendered in the router's web management interface. An attacker can craft a malicious payload and inject it into these parameters, which, when viewed by an administrator or user with access to the router's web interface, executes arbitrary JavaScript or HTML code. This type of vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation). The CVSS v3.1 base score is 6.1, indicating a medium severity level, with the vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. This means the attack can be performed remotely over the network without privileges, requires user interaction (such as an admin visiting the affected page), and affects confidentiality and integrity with a scope change (the vulnerability affects components beyond the initially vulnerable component). There are no known public exploits or patches available at the time of publication. The vulnerability could allow attackers to steal sensitive information, hijack sessions, or perform unauthorized actions within the router's management interface, potentially leading to further network compromise. The lack of authentication requirements for the attack vector and the router's common use in enterprise and home networks make this a notable risk.

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 23 Dec 2025, 17:22 UTC

WeaknessesCWE-79

Technical details

References

Community reviews

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