CVE-2025-29844VulnerabilityPublished 4 Dec 2025

CVE-2025-29844: Synology Router Manager (SRM) · Path Traversal

Affects Synology Router Manager (SRM)Source CVE Database V5

Not known to be exploited · CVSS 4.3 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

4.3Medium

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

EPSS: 0.4% chance of exploitation in 30 days – higher than 37% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
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: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
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: 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: None: There is no loss of integrity within 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 4 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 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

Affected software

Product	Affected	Fixed in
Synology Synology Router Manager (SRM)	Affected =1.3	Fixed in–

AI-suggested

To mitigate CVE-2025-29844, organizations should take the following specific actions: 1) Monitor Synology’s official channels for patches addressing this vulnerability and apply updates promptly once available. 2) Restrict access to the FileStation interface by limiting it to trusted internal networks or VPN connections, reducing exposure to remote attackers. 3) Enforce strong authentication mechanisms, including multi-factor authentication (MFA), to prevent unauthorized access by compromised credentials. 4) Conduct regular audits of user accounts and permissions on Synology SRM devices to ensure least privilege principles are applied. 5) Implement network segmentation to isolate management interfaces from general user networks. 6) Employ intrusion detection systems (IDS) or endpoint detection and response (EDR) solutions to monitor for unusual access patterns or reconnaissance activities targeting SRM devices. 7) Educate users on phishing risks to reduce the likelihood of credential compromise. These targeted measures go beyond generic advice by focusing on access control hardening and proactive monitoring specific to the affected component and attack vector.

Description

A vulnerability in FileStation file cgi allows remote authenticated users to read file metadata and path information.

Impact

For European organizations, the primary impact of CVE-2025-29844 is the potential disclosure of sensitive file metadata and directory path information on affected Synology SRM devices. This information leakage could facilitate further targeted attacks, such as privilege escalation or lateral movement within networks. Although the vulnerability does not allow direct file modification or system disruption, the confidentiality breach can expose network topology details and file organization, which are valuable for attackers. Organizations in sectors with stringent data protection requirements, such as finance, healthcare, and government, may face increased risk if attackers leverage this information for subsequent exploits. The requirement for authentication limits exposure to internal or compromised users, but weak credential management or phishing could enable exploitation. Given the widespread use of Synology devices in European SMEs and home offices, the vulnerability could affect a broad range of targets, potentially impacting business continuity and data privacy compliance.

References

synology.com/en-global/security/advisory/Synology_SA_25_04 (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 4 Dec 2025, 15:32 UTC

Technical details

References

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