CVE-2022-24721: CometD is a scalable comet implementation for web messaging

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HIGH 8.1UPGRADE

CVE-2022-24721 is a high-severity flaw (CVSS 8.1) affecting cometd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CometD is a scalable comet implementation for web messaging. In any version prior to 5.0.11, 6.0.6, and 7.0.6, internal usage of Oort and Seti channels is improperly authorized, so any remote user could subscribe and publish to those channels. By subscribing to those channels, a remote user may be able to watch cluster-internal traffic that contains other users' (possibly sensitive) data. By publishing to those channels, a remote user may be able

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.1% (top 33%)
CISA exploited list	No
Weakness	CWE-863
Published	2022-03-15
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: cometd

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

Am I affected?

Timeline

2022-03-15 14:15 UTCPublished CVE record published
2026-06-17 04:32 UTCUpdated Record last modified

cometd cometd UPGRADE

Affected: < 5.0.11 · >= 6.0.0 and < 6.0.6 · >= 7.0.0 and < 7.0.6

Fixed in: 5.0.11, 6.0.6, 7.0.6

Safe to downgrade to: a release before 6.0.0

1. Check installed version

apt-cache policy cometd || rpm -q cometd || cometd --version

2. UPGRADE to 5.0.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cometd

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cometd

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.0.0 (Debian / Ubuntu)

apt-cache madison cometd sudo apt install cometd=<VERSION_BEFORE_6.0.0> sudo apt-mark hold cometd

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cometd sudo dnf downgrade cometd-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add cometd

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-2022-24721?

cometd: upgrade to 5.0.11, 6.0.6, 7.0.6. Exact commands for each OS are on this page.

Is CVE-2022-24721 being exploited?

CVE-2022-24721 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-2022-24721 affect?

CVE-2022-24721 affects cometd. Severity is high (CVSS 8.1). CometD is a scalable comet implementation for web messaging. In any version prior to 5.0.11, 6.0.6, and 7.0.6, internal usage of Oort and Seti channels is improperly authorized, so any remote user could subscribe and publish to those channe

How urgent is CVE-2022-24721?

Priority 45/100. High severity

References

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