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Fencer Vulns
high 7.5

CVE-2021-44758 json

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 an…

published 2022-12-26 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-31573

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

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.

Patch / fix

  • heimdal_project heimdal 7.7.1
  • heimdal Debian 14, Debian 13, Debian 12 7.8.git20221115.a6cf945+dfsg-1

debian advisories DEBIAN-CVE-2021-44758

  • heimdal Ubuntu 18.04 LTS 7.5.0+dfsg-1ubuntu0.3
  • heimdal Ubuntu 20.04 LTS 7.7.0+dfsg-1ubuntu1.3
  • heimdal Ubuntu Pro 14.04 LTS 1.6~git20131207+dfsg-1ubuntu1.2+esm3
  • heimdal Ubuntu Pro 16.04 LTS 1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3

ubuntu advisories UBUNTU-CVE-2021-44758

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libheimdal Package Hub 15 SP3, openSUSE Leap 15.3 7.8.0-bp153.2.4.1
  • libheimdal Package Hub 15 SP4, openSUSE Leap 15.4 7.8.0-bp154.2.4.1

opensuse advisories openSUSE-SU-2023:0020-1openSUSE-SU-2023:0019-1

  • heimdal Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 7.7.1-r0

alpine advisories ALPINE-CVE-2021-44758

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • samba Azure Linux 3.0 4.18.3-1

azure linux advisories AZL-44859

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

1.33% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.