MEDIUM
CVE-2021-37750
CWE-476Published: August 23, 2021· Updated: Jun 17, 2026
6.5
CVSS v3.1
Official Description
The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.
Technical Analysis
CVE-2021-37750 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
mit1 product(s)
kerberos 5
Oracle1 product(s)
communications cloud native core network slice selection function
starwindsoftware1 product(s)
starwind virtual san
Source: NVD CPE · 5 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (16)
→
https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49Patch · Third Party Advisory
→
https://github.com/krb5/krb5/releasesRelease Notes · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/09/msg00019.htmlMailing List · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210923-0002/Third Party Advisory
→
https://web.mit.edu/kerberos/advisories/Vendor Advisory
→
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch · Third Party Advisory
→
https://www.starwindsoftware.com/security/sw-20220817-0004/Third Party Advisory
→
https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49Patch · Third Party Advisory
→
https://github.com/krb5/krb5/releasesRelease Notes · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/09/msg00019.htmlMailing List · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210923-0002/Third Party Advisory
→
https://web.mit.edu/kerberos/advisories/Vendor Advisory
→
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch · Third Party Advisory
Quick Facts
CVE IDCVE-2021-37750
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-476
CISA KEVNo
Affected5 vendor(s)
PublishedAug 23, 2021
Related CVEs (CWE-476)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-37750 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.