CVE-2010-4021

CVE-2010-4021 is a low-severity vulnerability in Mit Kerberos 5 with a CVSS 2.0 base score of 2.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-16.

Key facts

Description

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.7 does not properly restrict the use of TGT credentials for armoring TGS requests, which might allow remote authenticated users to impersonate a client by rewriting an inner request, aka a "KrbFastReq forgery issue."

Frequently asked questions

What is CVE-2010-4021?
The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.7 does not properly restrict the use of TGT credentials for armoring TGS requests, which might allow remote authenticated users to impersonate a client by rewriting an inner request, aka a "KrbFastReq forgery issue."
How severe is CVE-2010-4021?
CVE-2010-4021 has a CVSS 2.0 base score of 2.1, rated low severity.
Is CVE-2010-4021 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2010-4021?
CVE-2010-4021 affects Mit Kerberos 5. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2010-4021?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2010-4021 published?
CVE-2010-4021 was published on 2010-12-02 and last updated on 2026-06-16.

References

Affected products (1)

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