CVE-2021-3698: A flaw was found in Cockpit in versions prior to 260 in the way it handles the certificate verification perfor

Q: How do I fix CVE-2021-3698?

cockpit: upgrade to 260; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2021-3698 being exploited?

CVE-2021-3698 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-3698 affect?

CVE-2021-3698 affects cockpit, enterprise linux. Severity is high (CVSS 7.5). A flaw was found in Cockpit in versions prior to 260 in the way it handles the certificate verification performed by the System Security Services Daemon (SSSD). This flaw allows client certificates to authenticate successfully, regardless o

Q: How urgent is CVE-2021-3698?

Priority 50/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2021-3698 is a high-severity flaw (CVSS 7.5) affecting cockpit, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in Cockpit in versions prior to 260 in the way it handles the certificate verification performed by the System Security Services Daemon (SSSD). This flaw allows client certificates to authenticate successfully, regardless of the Certificate Revocation List (CRL) configuration or the certificate status. The highest threat from this vulnerability is to confidentiality.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-295
Published	2022-03-10
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: cockpit-project · redhat

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

Am I affected?

Timeline

2022-03-10 17:42 UTCPublished CVE record published
2026-06-17 04:05 UTCUpdated Record last modified

cockpit-project cockpit UPGRADE

Affected: < 260

Fixed in: 260

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 260 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cockpit

Note

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

redhat enterprise linux MITIGATE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

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.

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-2021-3698?

cockpit: upgrade to 260; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-3698 being exploited?

CVE-2021-3698 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-2021-3698 affect?

CVE-2021-3698 affects cockpit, enterprise linux. Severity is high (CVSS 7.5). A flaw was found in Cockpit in versions prior to 260 in the way it handles the certificate verification performed by the System Security Services Daemon (SSSD). This flaw allows client certificates to authenticate successfully, regardless o

How urgent is CVE-2021-3698?

Priority 50/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

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References

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