CVE-2022-41916: Heimdal is an implementation of ASN.1/DER, PKIX, and Kerberos

Q: How do I fix CVE-2022-41916?

heimdal: upgrade to 7.7.1; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2022-41916 being exploited?

CVE-2022-41916 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-2022-41916 affect?

CVE-2022-41916 affects heimdal, debian linux. Severity is medium (CVSS 5.9). Heimdal is an implementation of ASN.1/DER, PKIX, and Kerberos. Versions prior to 7.7.1 are vulnerable to a denial of service vulnerability in Heimdal's PKI certificate validation library, affecting the KDC (via PKINIT) and kinit (via PKINIT

Q: How urgent is CVE-2022-41916?

Priority 46/100. Remotely exploitable, no login, no user action; On your watchlist

This month

MEDIUM 5.9REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2022-41916 is a medium-severity flaw (CVSS 5.9) affecting heimdal, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heimdal is an implementation of ASN.1/DER, PKIX, and Kerberos. Versions prior to 7.7.1 are vulnerable to a denial of service vulnerability in Heimdal's PKI certificate validation library, affecting the KDC (via PKINIT) and kinit (via PKINIT), as well as any third-party applications using Heimdal's libhx509. Users should upgrade to Heimdal 7.7.1 or 7.8. There are no known workarounds for this issue.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-193
Published	2022-11-15
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: debian · heimdal project

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

Am I affected?

Timeline

2022-11-15 23:15 UTCPublished CVE record published
2026-06-17 05:04 UTCUpdated Record last modified

heimdal project heimdal UPGRADE

Affected: < 7.7.1

Fixed in: 7.7.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 7.7.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade heimdal

Note

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

debian debian linux MITIGATE

Affected: 10.0 · 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

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-2022-41916?

heimdal: upgrade to 7.7.1; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-41916 being exploited?

CVE-2022-41916 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-2022-41916 affect?

CVE-2022-41916 affects heimdal, debian linux. Severity is medium (CVSS 5.9). Heimdal is an implementation of ASN.1/DER, PKIX, and Kerberos. Versions prior to 7.7.1 are vulnerable to a denial of service vulnerability in Heimdal's PKI certificate validation library, affecting the KDC (via PKINIT) and kinit (via PKINIT

How urgent is CVE-2022-41916?

Priority 46/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities

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References

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