CVE-2023-53966: SOUND4 LinkAndShare Transmitter 1.1.2 contains a format string vulnerability that allows attackers to trigger

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2023-53966 is a critical-severity flaw (CVSS 9.8) affecting linkandshare transmitter. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SOUND4 LinkAndShare Transmitter 1.1.2 contains a format string vulnerability that allows attackers to trigger memory stack overflows through maliciously crafted environment variables. Attackers can manipulate the username environment variable with format string payloads to potentially execute arbitrary code and crash the application.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

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	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-134
Published	2025-12-22
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: sound4

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-22 22:16 UTCPublished CVE record published
2026-06-17 06:46 UTCUpdated Record last modified

sound4 linkandshare transmitter DOWNGRADE

Affected: 1.1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1.2

1. Check installed version

apt-cache policy linkandshare-transmitter || rpm -q linkandshare-transmitter || linkandshare-transmitter --version

2. No fixed release: DOWNGRADE to a release before 1.1.2 (Debian / Ubuntu)

apt-cache madison linkandshare-transmitter sudo apt install linkandshare-transmitter=<VERSION_BEFORE_1.1.2> sudo apt-mark hold linkandshare-transmitter

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

dnf --showduplicates list linkandshare-transmitter sudo dnf downgrade linkandshare-transmitter-<VERSION_BEFORE_1.1.2> sudo dnf versionlock add linkandshare-transmitter

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 46 · amule · FIXED · 3.2.0-1.fc46 · FEDORA-2026-4feb2647b0 · source

sudo dnf upgrade --advisory=FEDORA-2026-4feb2647b0

Fedora ELN · mysql9.7 · FIXED · 9.7.4-3.eln159 · FEDORA-2026-ea1c50e49b · source

sudo dnf upgrade --advisory=FEDORA-2026-ea1c50e49b

Public exploits and detection

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

Write-up: www.exploit-db.com/exploits/51259
Write-up: www.zeroscience.mk/en/vulnerabilities/ZSL-2023-5744.php

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-2023-53966?

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

Is CVE-2023-53966 being exploited?

CVE-2023-53966 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-2023-53966 affect?

CVE-2023-53966 affects linkandshare transmitter. Severity is critical (CVSS 9.8). SOUND4 LinkAndShare Transmitter 1.1.2 contains a format string vulnerability that allows attackers to trigger memory stack overflows through maliciously crafted environment variables. Attackers can manipulate the username environment variab

How urgent is CVE-2023-53966?

Priority 61/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

References

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