Vulnerability · Published Aug 23, 2021 · Assigned by mitre
CVE-2021-37750
Medium 6.5
In plain English
A medium-severity security flaw in the krb5 package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.5% (higher than 85% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)2.5%top 15.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | krb5 | 1.19.3-r0 | ALPINE-CVE-2021-37750 |
| Alpine:v3.21 | krb5 | 1.19.3-r0 | ALPINE-CVE-2021-37750 |
| Alpine:v3.22 | krb5 | 1.19.3-r0 | ALPINE-CVE-2021-37750 |
| Alpine:v3.23 | krb5 | 1.19.3-r0 | ALPINE-CVE-2021-37750 |
| Alpine:v3.24 | krb5 | 1.19.3-r0 | ALPINE-CVE-2021-37750 |
| Debian:12 | krb5 | 1.18.3-7 | DEBIAN-CVE-2021-37750 |
| Debian:13 | krb5 | 1.18.3-7 | DEBIAN-CVE-2021-37750 |
| Debian:14 | krb5 | 1.18.3-7 | DEBIAN-CVE-2021-37750 |
| Rocky Linux:8 | krb5 | 0:1.18.2-8.3.el8_4 | RLSA-2021:3576 |
Affected products (as reported)
References
- https://web.mit.edu/kerberos/advisories/
- https://github.com/krb5/krb5/releases
- FEDORA-2021-f2c8514f02 vendor-advisory
- [debian-lts-announce] 20210930 [SECURITY] [DLA 2771-1] krb5 security update mailing-list
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49
- https://security.netapp.com/advisory/ntap-20210923-0002/
- https://www.starwindsoftware.com/security/sw-20220817-0004/
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html