LOW
CVE-2010-4021
CWE-16Published: December 2, 2010· Updated: Jun 16, 2026
2.1
CVSS v3.1
Official 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."
Technical Analysis
CVE-2010-4021 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityNone
IntegrityP
AvailabilityNone
AV:N/AC:H/Au:S/C:N/I:P/A:N
Affected Vendors & Products
mit1 product(s)
kerberos 5
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
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Official NIST entry
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Official Patches & Advisories
All References (34)
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Quick Facts
CVE IDCVE-2010-4021
CVSS Score2.1 / 10
SeverityLOW
WeaknessCWE-16
CISA KEVNo
Affected1 vendor(s)
PublishedDec 2, 2010
Related CVEs (CWE-16)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2010-4021 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.