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CVE-2010-4021

14
FAUCET Score

CVE-2010-4021 describes a vulnerability in the Key Distribution Center (KDC) of MIT Kerberos 5 (krb5) version 1.7. This flaw allows remote authenticated users to potentially impersonate a client by manipulating TGS requests, specifically by rewriting an inner request, a weakness known as a "KrbFastReq forgery issue." The vulnerability has a CVSS score of 2.1, indicating a low severity with network access, high attack complexity, authenticated user requirement, and a potential impact of partial integrity compromise. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.7CPE matchmatch criteria
cpe:2.3:a:mit:kerberos_5:1.7:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

2.1LOW

AV:N/AC:H/Au:S/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
SINGLE
Exploitability Score
3.9
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.09%
Probability of exploitation in next 30 days
EPSS Percentile
79.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0209 is in the 91st percentile among its peer group of 1,638 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2010-4021Low

krb5: KDC may issue unrequested tickets due to KrbFastReq forgery (MITKRB5-SA-2010-007)

Nov 30, 2010

References

kb.vmware.com / kb/1035108
lists.apple.com / archives/security-announce/2011/Mar/msg00006.html
lists.opensuse.org / opensuse-security-announce/2010-12/msg00000.html
lists.opensuse.org / opensuse-security-announce/2010-12/msg00006.html
lists.vmware.com / pipermail/security-announce/2011/000133.html
osvdb.org / 69607
support.apple.com / kb/HT4581
web.mit.edu / kerberos/advisories/MITKRB5-SA-2010-007.txt
Vendor Advisory
mandriva.com / security/advisories
securityfocus.com / archive/1/514953/100/0/threaded
securityfocus.com / archive/1/517739/100/0/threaded
securityfocus.com / bid/45122
securitytracker.com / id
ubuntu.com / usn/USN-1030-1
vmware.com / security/advisories/VMSA-2011-0007.html
vupen.com / english/advisories/2010/3094
vupen.com / english/advisories/2010/3118