Is CVE-2010-4021 in the CISA KEV catalog?

No. CVE-2010-4021 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2010-4021?

CVE-2010-4021 has a CVSS v2 base score of 2.1 (LOW).

What is the EPSS score for CVE-2010-4021?

CVE-2010-4021 has an EPSS score of 2.09% (79th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2010-4021?

Upgrade krb5 on debian 11 to 1.8+dfsg~alpha1-1 or later.

CVE & CISA-KEV Catalog

CVE-2010-4021

LOWEPSS 79th pctl

2.1

CVSS v2

NVD

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."

CWE-16 CWE-264Permissions, Privileges, and Access Controls

How to fix

Remediation Available

krb5Debian

Fixed in:1.8+dfsg~alpha1-1CVE-2010-4021

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

2.09%probability of exploitation in 30 days

79thpercentile

Elevated risk: more likely to be exploited than 79% of all known CVEs.

References

Vendor Advisory1

web.mit.edu

Other references16

Related Vulnerabilities

Other CWE-16 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-2335	Medium	5.0	85%	-	Fix
CVE-2004-2687	High	9.3	81%	-	Fix
CVE-2006-3677	High	7.5	78%	-	Fix
CVE-2011-4404	Medium	5.0	60%	-	-
CVE-2006-0848	Medium	5.1	58%	-	-
CVE-2007-3898	Medium	6.4	55%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.