CVE-2004-2629: Multiple vulnerabilities in the H.323 protocol implementation for First Virtual Communications Click to Meet E

This month

HIGH 7.8DOWNGRADEDOWNGRADEDOWNGRADE

CVE-2004-2629 is a high-severity flaw (CVSS 7.8) affecting click to meet express, click to meet premier, conference server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple vulnerabilities in the H.323 protocol implementation for First Virtual Communications Click to Meet Express (when used with H.323 conferencing endpoints), Click to Meet Premier, Conference Server, and V-Gate allow remote attackers to cause a denial of service, as demonstrated by the NISCC/OUSPG PROTOS test suite for the H.225 protocol.

Why this priority

High severity

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

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: first virtual communications

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:10 UTCUpdated Record last modified

first virtual communications click to meet express DOWNGRADE

Affected: h.323

Fixed in: no fixed release known

Safe to downgrade to: a release before h.323

1. Check installed version

apt-cache policy click-to-meet-express || rpm -q click-to-meet-express || click-to-meet-express --version

2. No fixed release: DOWNGRADE to a release before h.323 (Debian / Ubuntu)

apt-cache madison click-to-meet-express sudo apt install click-to-meet-express=<VERSION_BEFORE_h.323> sudo apt-mark hold click-to-meet-express

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

dnf --showduplicates list click-to-meet-express sudo dnf downgrade click-to-meet-express-<VERSION_BEFORE_h.323> sudo dnf versionlock add click-to-meet-express

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.

first virtual communications click to meet premier DOWNGRADE

Affected: h.323

Fixed in: no fixed release known

Safe to downgrade to: a release before h.323

1. Check installed version

apt-cache policy click-to-meet-premier || rpm -q click-to-meet-premier || click-to-meet-premier --version

2. No fixed release: DOWNGRADE to a release before h.323 (Debian / Ubuntu)

apt-cache madison click-to-meet-premier sudo apt install click-to-meet-premier=<VERSION_BEFORE_h.323> sudo apt-mark hold click-to-meet-premier

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

dnf --showduplicates list click-to-meet-premier sudo dnf downgrade click-to-meet-premier-<VERSION_BEFORE_h.323> sudo dnf versionlock add click-to-meet-premier

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.

first virtual communications conference server DOWNGRADE

Affected: h.323

Fixed in: no fixed release known

Safe to downgrade to: a release before h.323

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before h.323 (Debian / Ubuntu)

apt-cache madison conference-server sudo apt install conference-server=<VERSION_BEFORE_h.323> sudo apt-mark hold conference-server

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

dnf --showduplicates list conference-server sudo dnf downgrade conference-server-<VERSION_BEFORE_h.323> sudo dnf versionlock add conference-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.

first virtual communications v-gate DOWNGRADE

Affected: h.323

Fixed in: no fixed release known

Safe to downgrade to: a release before h.323

1. Check installed version

apt-cache policy v-gate || rpm -q v-gate || v-gate --version

2. No fixed release: DOWNGRADE to a release before h.323 (Debian / Ubuntu)

apt-cache madison v-gate sudo apt install v-gate=<VERSION_BEFORE_h.323> sudo apt-mark hold v-gate

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

dnf --showduplicates list v-gate sudo dnf downgrade v-gate-<VERSION_BEFORE_h.323> sudo dnf versionlock add v-gate

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-2004-2629?

click to meet express: downgrade or apply the listed mitigation; click to meet premier: downgrade or apply the listed mitigation; conference server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-2629 being exploited?

CVE-2004-2629 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-2004-2629 affect?

CVE-2004-2629 affects click to meet express, click to meet premier, conference server. Severity is high (CVSS 7.8). Multiple vulnerabilities in the H.323 protocol implementation for First Virtual Communications Click to Meet Express (when used with H.323 conferencing endpoints), Click to Meet Premier, Conference Server, and V-Gate allow remote attackers

How urgent is CVE-2004-2629?

Priority 48/100. High severity

References

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