CVE-2024-0643: Unrestricted upload of dangerous file types in the C21 Live Encoder and Live Mosaic product, version 5.3

This month

CRITICAL 10.0REMOTEDOWNGRADE

CVE-2024-0643 is a critical-severity flaw (CVSS 10.0) affecting live encoder. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unrestricted upload of dangerous file types in the C21 Live Encoder and Live Mosaic product, version 5.3. This vulnerability allows a remote attacker to upload different file extensions without any restrictions, resulting in a full system compromise.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-434
Published	2024-01-17
Last modified	2026-06-17

Publisher (CNA): Spanish National Cybersecurity Institute, S.A. (INCIBE) · Vendor: cires21

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

Am I affected?

Timeline

2024-01-17 14:15 UTCPublished CVE record published
2026-06-17 06:53 UTCUpdated Record last modified

cires21 live encoder DOWNGRADE

Affected: 5.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.3

1. Check installed version

apt-cache policy live-encoder || rpm -q live-encoder || live-encoder --version

2. No fixed release: DOWNGRADE to a release before 5.3 (Debian / Ubuntu)

apt-cache madison live-encoder sudo apt install live-encoder=<VERSION_BEFORE_5.3> sudo apt-mark hold live-encoder

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

dnf --showduplicates list live-encoder sudo dnf downgrade live-encoder-<VERSION_BEFORE_5.3> sudo dnf versionlock add live-encoder

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.

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-2024-0643?

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

Is CVE-2024-0643 being exploited?

CVE-2024-0643 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-2024-0643 affect?

CVE-2024-0643 affects live encoder. Severity is critical (CVSS 10.0). Unrestricted upload of dangerous file types in the C21 Live Encoder and Live Mosaic product, version 5.3. This vulnerability allows a remote attacker to upload different file extensions without any restrictions, resulting in a full system c

How urgent is CVE-2024-0643?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-0642 CRITICAL 9.8 DOWNGRADE Inadequate access control in the C21 Live Encoder and Live Mosaic product, version 5.3

References

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