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    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."

    Published:Nov 30, 2010
    Last Modified:Apr 11, 2025
    EPS:Dec 2, 2010
    EPSS Score:0.0047
    CVSS Score:2.1

    Affected Products

    Vendor
    Mit
    Product
    Kerberos 5

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-40356 (CVSS 5.9) — 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 (CVSS 5.9) — In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference if an application calls gss_ac…
    CVE-2024-37370 (CVSS 7.5) — In MIT Kerberos 5 (aka krb5) before 1.21.3, an attacker can modify the plaintext Extra Count field of a confid…
    CVE-2024-37371 (CVSS 9.1) — In MIT Kerberos 5 (aka krb5) before 1.21.3, an attacker can cause invalid memory reads during GSS message toke…
    CVE-2024-26462 (CVSS 5.5) — Kerberos 5 (aka krb5) 1.21.2 contains a memory leak vulnerability in /krb5/src/kdc/ndr.c.…
    CVE-2024-26461 (CVSS 7.5) — Kerberos 5 (aka krb5) 1.21.2 contains a memory leak vulnerability in /krb5/src/lib/gssapi/krb5/k5sealv3.c.…
    CVE-2024-26458 (CVSS 5.3) — Kerberos 5 (aka krb5) 1.21.2 contains a memory leak in /krb5/src/lib/rpc/pmap_rmt.c.…
    CVE-2025-24528 (CVSS 7.1) — In MIT Kerberos 5 (aka krb5) before 1.22 (with incremental propagation), there is an integer overflow for a la…
    CVE-2023-39975 (CVSS 8.8) — kdc/do_tgs_req.c in MIT Kerberos 5 (aka krb5) 1.21 before 1.21.2 has a double free that is reachable if an aut…
    CVE-2023-36054 (CVSS 6.5) — lib/kadm5/kadm_rpc_xdr.c in MIT Kerberos 5 (aka krb5) before 1.20.2 and 1.21.x before 1.21.1 frees an uninitia…

    References

    http://kb.vmware.com/kb/1035108
    http://lists.apple.com/archives/security-announce/2011/Mar/msg00006.html
    http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00000.html
    http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00006.html
    http://lists.vmware.com/pipermail/security-announce/2011/000133.html
    http://osvdb.org/69607
    http://support.apple.com/kb/HT4581
    http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-007.txt
    http://www.mandriva.com/security/advisories?name=MDVSA-2010:246
    http://www.securityfocus.com/archive/1/514953/100/0/threaded
    http://www.securityfocus.com/archive/1/517739/100/0/threaded
    http://www.securityfocus.com/bid/45122
    http://www.securitytracker.com/id?1024803
    http://www.ubuntu.com/usn/USN-1030-1
    http://www.vmware.com/security/advisories/VMSA-2011-0007.html
    http://www.vupen.com/english/advisories/2010/3094
    http://www.vupen.com/english/advisories/2010/3118
    http://kb.vmware.com/kb/1035108
    http://lists.apple.com/archives/security-announce/2011/Mar/msg00006.html
    http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00000.html
    http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00006.html
    http://lists.vmware.com/pipermail/security-announce/2011/000133.html
    http://osvdb.org/69607
    http://support.apple.com/kb/HT4581
    http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-007.txt
    http://www.mandriva.com/security/advisories?name=MDVSA-2010:246
    http://www.securityfocus.com/archive/1/514953/100/0/threaded
    http://www.securityfocus.com/archive/1/517739/100/0/threaded
    http://www.securityfocus.com/bid/45122
    http://www.securitytracker.com/id?1024803
    http://www.ubuntu.com/usn/USN-1030-1
    http://www.vmware.com/security/advisories/VMSA-2011-0007.html
    http://www.vupen.com/english/advisories/2010/3094
    http://www.vupen.com/english/advisories/2010/3118

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High