CVE-2024-37371: In MIT Kerberos 5 (aka krb5) before 1.21.3, an attacker can cause invalid memory reads during GSS message toke

Q: How do I fix CVE-2024-37371?

kerberos 5: upgrade to 1.21.3; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2024-37371 being exploited?

CVE-2024-37371 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-2024-37371 affect?

CVE-2024-37371 affects kerberos 5, debian linux. Severity is critical (CVSS 9.1). In MIT Kerberos 5 (aka krb5) before 1.21.3, an attacker can cause invalid memory reads during GSS message token handling by sending message tokens with invalid length fields.

Q: How urgent is CVE-2024-37371?

Priority 62/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.1REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2024-37371 is a critical-severity flaw (CVSS 9.1) affecting kerberos 5, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In MIT Kerberos 5 (aka krb5) before 1.21.3, an attacker can cause invalid memory reads during GSS message token handling by sending message tokens with invalid length fields.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-125
Published	2024-06-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · mit

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

Am I affected?

Timeline

2024-06-28 23:15 UTCPublished CVE record published
2026-06-17 07:38 UTCUpdated Record last modified

mit kerberos 5 UPGRADE

Affected: < 1.21.3

Fixed in: 1.21.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy kerberos-5 || rpm -q kerberos-5 || kerberos-5 --version

2. UPGRADE to 1.21.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kerberos-5

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kerberos-5

Note

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

debian debian linux MITIGATE

Affected: 11.0 · 12.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

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-2024-37371?

kerberos 5: upgrade to 1.21.3; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-37371 being exploited?

CVE-2024-37371 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-2024-37371 affect?

CVE-2024-37371 affects kerberos 5, debian linux. Severity is critical (CVSS 9.1). In MIT Kerberos 5 (aka krb5) before 1.21.3, an attacker can cause invalid memory reads during GSS message token handling by sending message tokens with invalid length fields.

How urgent is CVE-2024-37371?

Priority 62/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2026-40356 MEDIUM 5.9 UPGRADE In MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read if
CVE-2026-40355 MEDIUM 5.9 UPGRADE In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference if an application calls gss_ac
CVE-2022-42898 HIGH 8.8 UPGRADE UPGRADE PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may
CVE-2024-37370 HIGH 7.5 UPGRADE In MIT Kerberos 5 (aka krb5) before 1.21.3, an attacker can modify the plaintext Extra Count field of a confid
CVE-2024-26462 MEDIUM 5.5 DOWNGRADE MITIGATE Kerberos 5 (aka krb5) 1.21.2 contains a memory leak vulnerability in /krb5/src/kdc/ndr.c.

References

← Back to latest CVEs