CVE-2025-13315: Twonky Server 8.5.2 on Linux and Windows is vulnerable to an access control flaw

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CRITICAL 9.8REMOTEWATCHLISTDOWNGRADE

CVE-2025-13315 is a critical-severity flaw (CVSS 9.8) affecting twonky server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
EPSS top 2%: very likely to be exploited
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	31.2% (top 2%)
CISA exploited list	No
Weakness	CWE-420
Published	2025-11-19
Last modified	2026-10-18

Publisher (CNA): Rapid7, Inc. · Vendor: lynxtechnology

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-19 18:15 UTCPublished CVE record published
2026-10-18 20:10 UTCUpdated Record last modified

lynxtechnology twonky server DOWNGRADE

Affected: 8.5.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.5.2

1. Check installed version

apt-cache policy twonky-server || rpm -q twonky-server || twonky-server --version

2. No fixed release: DOWNGRADE to a release before 8.5.2 (Debian / Ubuntu)

apt-cache madison twonky-server sudo apt install twonky-server=<VERSION_BEFORE_8.5.2> sudo apt-mark hold twonky-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list twonky-server sudo dnf downgrade twonky-server-<VERSION_BEFORE_8.5.2> sudo dnf versionlock add twonky-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · openjpeg · FIXED · 2.5.4-5.eln159 · FEDORA-2026-1a5f60f401 · source

sudo dnf upgrade --advisory=FEDORA-2026-1a5f60f401

Fedora 46 · trustedqsl · FIXED · 2.8.7-1.fc46 · FEDORA-2026-6b1bc90ebc · source

sudo dnf upgrade --advisory=FEDORA-2026-6b1bc90ebc

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: 0xBlackash/CVE-2025-13315 (0 stars)
Write-up: www.rapid7.com/blog/post/cve-2025-13315-cve-2025-13316-critical-twonky-server-authenticati
Metasploit: Twonky Server Log Leak Authentication Bypass
Nuclei scan template: Twonky Server 8.5.2 on Linux and Windows - Log File Exposure

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-13315?

twonky server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-13315 being exploited?

CVE-2025-13315 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-13315 affect?

CVE-2025-13315 affects twonky server. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2025-13315?

Priority 77/100. Critical severity; EPSS top 2%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Windows vulnerabilities

Related CVEs

CVE-2025-13316 HIGH 8.1 DOWNGRADE Twonky Server 8.5.2 on Linux and Windows is vulnerable to a cryptographic flaw, use of hard-coded cryptographi

References

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