CVE•Published 2021-07-22•Modified 2026-10-14•1 article on news•5 live references•NVD data
CVE-2021-36222Mit · Kerberos_5
Vulnerability data via NVD (ingested)
CVSS v3.1
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS percentile
96
Exploit Prediction Scoring System · top 4% of all CVEs
Weaknesses (CWE)
Description
ec_verify in kdc/kdc_preauth_ec.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.4 and 1.19.x before 1.19.2 allows remote attackers to cause a NULL pointer dereference and daemon crash. This occurs because a return value is not properly managed in a certain situation.
Timeline
Published 2021-07-22
Modified 2026-10-14
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2021-36222Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Mit Kerberos 5"All exposed Mit Kerberos 5 instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Kerberos 5"HTTP body or banner mentions "Kerberos 5" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2021-36222Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-36222Censys host search filtered to this CVE id.
grep.app
CVE-2021-36222Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-36222GitHub code search for direct mentions.
Google dork
"CVE-2021-36222" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2021-36222 on GitHub.