Free and open · new CVEs checked every 20 minutesStatusRSSOpen dataContact

CVE-2023-53955: SOUND4 IMPACT/FIRST/PULSE/Eco v2.x contains an insecure direct object reference vulnerability that allows atta

62
This week
CRITICAL 9.8REMOTEDOWNGRADEMITIGATEMITIGATE

CVE-2023-53955 is a critical-severity flaw (CVSS 9.8) affecting stream extension, wm2 firmware, big voice2 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SOUND4 IMPACT/FIRST/PULSE/Eco v2.x contains an insecure direct object reference vulnerability that allows attackers to bypass authorization and access hidden system resources. Attackers can exploit the vulnerability by manipulating user-supplied input to execute privileged functionalities without proper authentication.

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 score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.9% (top 42%)
CISA exploited listNo
WeaknessCWE-639
Published2025-12-22
Last modified2026-06-17
Publisher (CNA): VulnCheck · Vendor: sound4

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

sound4 stream extension DOWNGRADE
Affected: 2.4.29
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.4.29
1. Check installed version
apt-cache policy stream-extension || rpm -q stream-extension || stream-extension --version
2. No fixed release: DOWNGRADE to a release before 2.4.29 (Debian / Ubuntu)
apt-cache madison stream-extension sudo apt install stream-extension=<VERSION_BEFORE_2.4.29> sudo apt-mark hold stream-extension
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list stream-extension sudo dnf downgrade stream-extension-<VERSION_BEFORE_2.4.29> sudo dnf versionlock add stream-extension
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.
sound4 wm2 firmware MITIGATE
Affected: 1.11
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.11
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
sound4 big voice2 firmware MITIGATE
Affected: 1.30
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.30
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
sound4 big voice4 firmware MITIGATE
Affected: 1.2
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.2
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
sound4 pulse eco firmware MITIGATE
Affected: 1.16
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.16
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
sound4 impact eco firmware MITIGATE
Affected: 1.16
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.16
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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.

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-2023-53955?

stream extension: downgrade or apply the listed mitigation; wm2 firmware: mitigate or apply the listed mitigation; big voice2 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-53955 being exploited?

CVE-2023-53955 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-2023-53955 affect?

CVE-2023-53955 affects stream extension, wm2 firmware, big voice2 firmware. Severity is critical (CVSS 9.8). SOUND4 IMPACT/FIRST/PULSE/Eco v2.x contains an insecure direct object reference vulnerability that allows attackers to bypass authorization and access hidden system resources. Attackers can exploit the vulnerability by manipulating user-sup

How urgent is CVE-2023-53955?

Priority 62/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Related CVEs

References

← Back to latest CVEs

Get the weekly exploited-CVE digest by emailThe CVEs being attacked this week and how to fix them. No spam, unsubscribe any time.