What is the CVSS score of CVE-2025-13315?

CVE-2025-13315 has a CVSS 4.0 base score of 9.3 (Critical). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. EPSS exploitation probability: 82.4%.

Is there a public PoC exploit available for CVE-2025-13315?

Yes, a public proof-of-concept exploit is available for CVE-2025-13315. Prioritise patching immediately. EPSS: 82.4%.

How to fix or mitigate CVE-2025-13315?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Monitor vendor channels for patch availability.

Twonky Server CVE-2025-13315

CRITICAL

Unprotected Alternate Channel (CWE-420)

2025-11-19 cve@rapid7.com

Windows Information Disclosure Microsoft Twonky Server Lynxtechnology

9.3

CVSS 4.0 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-420 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V13 - Configuration Unprotected alternate channel
Impact	CVSS 9.3, EPSS 82.4%, PoC available. Twonky is a UPnP/DLNA media server widely deployed on NAS devices and home networks. Admin access to the media server can expose private media files, network configuration, and potentially enable lateral movement to the NAS storage.
Exploit ScenarioDerived	An attacker on the local network (or targeting an internet-exposed Twonky instance) retrieves the log file via the unauthenticated API. They extract the encrypted admin password and decrypt it using the known hard-coded key. With admin access, they browse and exfiltrate private media files, and explore the NAS filesystem for sensitive documents.

Emergency Immediate action required. Why: CRITICAL + EPSS > 30%, no patch available.

No patch listed yet 82.4% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

Twonky Server 8.5.2 on Linux and Windows allows unauthenticated access to the admin log file through a web service API bypass. The exposed log contains the administrator's username and encrypted password, which can be decrypted using hard-coded keys (CVE-2025-13316) to gain full administrative control.

Earlier versions of this analysis (1)

v1 Mar 28, 2026 - 19:23 CVSS 9.3

Unauthenticated admin credential exposure in Twonky Server via API access control bypass reveals encrypted password recoverable with hard-coded keys.

RemediationAI

Check with the device vendor for a Twonky Server update. Ensure Twonky Server is not exposed to the internet. Change the admin password after applying any fix. Restrict access to the Twonky web interface via firewall rules limiting it to trusted devices on the local network.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The Twonky Server web interface exposes API endpoints that should require authentication. An access control flaw allows unauthenticated users to retrieve the server's log file, which contains the administrator's username and an encrypted password. Combined with CVE-2025-13316 (hard-coded encryption keys), the password can be trivially decrypted, providing full administrative access to the media server.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.3 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

High

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

Lifecycle Timeline

PoC Detected

Dec 02, 2025 - 16:42 vuln.today

Public exploit code

CVE Published

Nov 19, 2025 - 18:15 nvd

CRITICAL 9.3

DescriptionCVE.org

Twonky Server 8.5.2 on Linux and Windows is vulnerable to an access control flaw. An unauthenticated attacker can bypass web service API authentication controls to leak a log file and read the administrator's username and encrypted password.

Executive ViewAI

Why It Matters

Organizations using Twonky Server 8.5.2 on Linux and Windows face critical risk from CVE-2025-13315 rated CVSS 9.3. Successful exploitation could critically impact the confidentiality, integrity, and availability of affected systems. With an EPSS score of 82%, this vulnerability faces very high likelihood of exploitation. Organizations should apply vendor updates immediately when available and implement compensating controls in the interim.

Business Impact: Severe

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.

Threat Intelligence Overview

Threat Score

5.8/10

Composite threat intelligence

EPSS Score

82.4%

Top 1% exploitable

Exploit

POC

Public exploit code exists

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS POC (2)

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 82.4%

Patch available No

Active threat Yes

Deciding rule

CRITICAL + EPSS > 30%, no patch available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

148

Low Medium High Critical

KEV: 0

EPSS: +82

CVSS: +46

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.