CVE-2025-13316

published 2025-11-19

CVE-2025-13316: 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…

Priority P2 64 high 8.1 CVSS 3.1

AV N AC H PR N UI N S U C H I H A H

EXPLOIT

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.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
lynxtechnology	twonky_server	—	—

Detection & IOCs extracted from sources · hover to see the quote

url /nmc/rpc/log_getfile↗

sigma↗

GET /nmc/rpc/log_getfile => status_code==200 AND body contains 'server_main_impl','LOG_SYSTEM:','upnp_ini_file'

• → Unauthenticated HTTP GET to /nmc/rpc/log_getfile is the exploit trigger; a 200 response containing 'server_main_impl', 'LOG_SYSTEM:', and 'upnp_ini_file' confirms successful log leak and credential exposure. ↗
• → The Metasploit auxiliary module 'auxiliary/gather/twonky_authbypass_logleak' chains CVE-2025-13315 (log leak) with CVE-2025-13316 (hardcoded key decryption) to recover plaintext administrator credentials; presence of this module in use indicates active exploitation. ↗
• → ZoomEye/Shodan fingerprint 'app="Twonky Server"' can be used to identify internet-exposed instances for proactive hunting. ↗

• · The encrypted administrator password is stored in Twonky Server configuration/logs and is decryptable using static (hardcoded) keys — no brute-force is required; any attacker who obtains the ciphertext can trivially recover the plaintext. ↗
• · No vendor patch is available; the recommended mitigation is to restrict access to the Twonky Server web service API or implement network segmentation. ↗
• · The vulnerability affects both Linux and Windows deployments of Twonky Server 8.5.2; detection logic should be applied platform-agnostically at the network/HTTP layer. ↗

CVSS provenance

nvd v3.1 8.1 HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd v4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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