What is the CVSS score of CVE-2025-13316?

CVE-2025-13316 has a CVSS 4.0 base score of 8.2 (High). CVSS vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N. EPSS exploitation probability: 72.7%.

Is there a public PoC exploit available for CVE-2025-13316?

Yes, a public proof-of-concept exploit is available for CVE-2025-13316. Prioritise patching immediately. EPSS: 72.7%.

How to fix or mitigate CVE-2025-13316?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

Twonky Server CVE-2025-13316

HIGH

Use of Hard-coded Cryptographic Key (CWE-321)

2025-11-19 cve@rapid7.com

Information Disclosure Microsoft Twonky Server Lynxtechnology

8.2

CVSS 4.0 · Vendor: rapid7

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Vulnerability Assessment

Weakness	CWE CWE-321 OWASP Top 10:2025 A04:2025 - Cryptographic Failures ASVS 5.0 V11 - Cryptography Key management, no hard-coded keys
Impact	CVSS 8.2, EPSS 72.7%. This vulnerability chains with CVE-2025-13315 (unauthenticated log exposure) to provide a complete unauthenticated-to-admin attack path. The hard-coded key means every Twonky Server installation worldwide shares the same vulnerability.
Exploit ScenarioDerived	Following exploitation of CVE-2025-13315, the attacker has the encrypted admin password from the log file. They use the hard-coded key (extracted from the Twonky Server binary) to decrypt it. With the plaintext admin password, they log into the media server, access all shared media files, and modify server configuration.

Act Now Prioritize within 24-48h. Why: HIGH severity + EPSS > 10%.

No patch listed yet 72.7% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

Twonky Server 8.5.2 uses hard-coded cryptographic keys for encrypting the administrator password. Combined with the credential exposure vulnerability (CVE-2025-13315), this allows attackers to decrypt the admin password from the leaked log file and gain full administrative control of the media server.

Earlier versions of this analysis (1)

v1 Mar 28, 2026 - 19:23 CVSS 8.2

Hard-coded encryption keys in Twonky Server allow decryption of admin passwords exposed via companion vulnerability CVE-2025-13315.

RemediationAI

Contact the device vendor for a Twonky Server update. Change the admin password after any fix. Restrict Twonky Server access to trusted devices. Consider disabling Twonky Server if DLNA functionality is not required.

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 stores the administrator password encrypted with a static, hard-coded key embedded in the binary. Since the key is identical across all installations, any attacker who obtains the encrypted password (via CVE-2025-13315 log file disclosure or other means) can decrypt it to plaintext using the known key.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (rapid7) PRIMARY 8.2 HIGH

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

Primary rating from Vendor (rapid7) · only source for this CVE.

CVSS VectorVendor: rapid7

Attack Vector

Network

Attack Complexity

High

Attack Requirements

None

Privileges Required

None

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

None

Vulnerable system: Availability

None

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

DescriptionCVE.org

Twonky Server 8.5.2 on Linux and Windows is vulnerable to a cryptographic flaw, use of hard-coded cryptographic keys. An attacker with knowledge of the encrypted administrator password can decrypt the value with static keys to view the plain text password and gain administrator-level access to Twonky Server.

Executive ViewAI

Why It Matters

Organizations using Twonky Server 8.5.2 on Linux and Windows face notable risk from CVE-2025-13316, a hard-coded crypto key vulnerability rated CVSS 8.2. Successful exploitation could allow attackers to execute arbitrary code or commands on affected systems, potentially leading to full system compromise. With an EPSS score of 73%, this vulnerability faces very high likelihood of exploitation. Organizations should apply vendor updates when available and consider 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

5.3/10

Composite threat intelligence

EPSS Score

72.7%

Top 1% exploitable

Exploit

POC

Public exploit code exists

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS POC (1)

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 HIGH

CISA KEV No

Public POC Yes

EPSS 72.7%

Patch available No

Active threat Yes

Deciding rule

HIGH severity + EPSS > 10%

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

Human Impact

Very High

Priority Score

134

Low Medium High Critical

KEV: 0

EPSS: +73

CVSS: +41

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.