Vulnerability · Published Dec 26, 2022 · Assigned by mitre
CVE-2021-44758
High 7.5
In plain English
A high-severity null pointer dereference in the heimdal package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 71% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)1.3%top 28.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Heimdal before 7.7.1 allows attackers to cause a NULL pointer dereference in a SPNEGO acceptor via a preferred_mech_type of GSS_C_NO_OID and a nonzero initial_response value to send_accept.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | heimdal | 7.7.1-r0 | ALPINE-CVE-2021-44758 |
| Alpine:v3.21 | heimdal | 7.7.1-r0 | ALPINE-CVE-2021-44758 |
| Alpine:v3.22 | heimdal | 7.7.1-r0 | ALPINE-CVE-2021-44758 |
| Alpine:v3.23 | heimdal | 7.7.1-r0 | ALPINE-CVE-2021-44758 |
| Alpine:v3.24 | heimdal | 7.7.1-r0 | ALPINE-CVE-2021-44758 |
| Debian:12 | heimdal | 7.8.git20221115.a6cf945+dfsg-1 | DEBIAN-CVE-2021-44758 |
| Debian:13 | heimdal | 7.8.git20221115.a6cf945+dfsg-1 | DEBIAN-CVE-2021-44758 |
| Debian:14 | heimdal | 7.8.git20221115.a6cf945+dfsg-1 | DEBIAN-CVE-2021-44758 |
| Ubuntu:22.04:LTS | heimdal | no fix listed | UBUNTU-CVE-2021-44758 |
| Ubuntu:24.04:LTS | heimdal | no fix listed | UBUNTU-CVE-2021-44758 |
| Ubuntu:25.10 | heimdal | no fix listed | UBUNTU-CVE-2021-44758 |
| Ubuntu:26.04:LTS | heimdal | no fix listed | UBUNTU-CVE-2021-44758 |
| Ubuntu:26.10 | heimdal | no fix listed | UBUNTU-CVE-2021-44758 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H