{"cve":"CVE-2010-4021","nvd":{"published":"2010-12-02T16:22:21.240","modified":"2026-06-16T23:23:59.903","status":"Modified","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.\"","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-16","CWE-264"],"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"],"products":["mit:kerberos_5"],"source":"nvd","synced_at":"2026-10-19T19:57:56.749847046+00:00"},"epss":{"cve":"CVE-2010-4021","score":0.02089,"percentile":0.81608,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}