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Vulnerability details: VCID-wpbb-uc5r-bud4
Vulnerability ID VCID-wpbb-uc5r-bud4
Aliases CVE-2021-44758
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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-476 NULL Pointer Dereference
System Score Found at
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00325 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
epss 0.00595 https://api.first.org/data/v1/epss?cve=CVE-2021-44758
cvssv3.1 7.5 https://github.com/heimdal/heimdal/commit/f9ec7002cdd526ae84fbacbf153162e118f22580
ssvc Track https://github.com/heimdal/heimdal/commit/f9ec7002cdd526ae84fbacbf153162e118f22580
cvssv3.1 7.5 https://github.com/heimdal/heimdal/security/advisories/GHSA-69h9-669w-88xv
ssvc Track https://github.com/heimdal/heimdal/security/advisories/GHSA-69h9-669w-88xv
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-44758
cvssv3.1 7.5 https://security.gentoo.org/glsa/202310-06
ssvc Track https://security.gentoo.org/glsa/202310-06
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-44758
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3671
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44758
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-3437
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41916
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-42898
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-44640
1024187 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1024187
202310-06 https://security.gentoo.org/glsa/202310-06
cpe:2.3:a:heimdal_project:heimdal:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:heimdal_project:heimdal:*:*:*:*:*:*:*:*
CVE-2021-44758 https://nvd.nist.gov/vuln/detail/CVE-2021-44758
f9ec7002cdd526ae84fbacbf153162e118f22580 https://github.com/heimdal/heimdal/commit/f9ec7002cdd526ae84fbacbf153162e118f22580
GHSA-69h9-669w-88xv https://github.com/heimdal/heimdal/security/advisories/GHSA-69h9-669w-88xv
USN-5800-1 https://usn.ubuntu.com/5800-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/heimdal/heimdal/commit/f9ec7002cdd526ae84fbacbf153162e118f22580
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-14T15:56:38Z/ Found at https://github.com/heimdal/heimdal/commit/f9ec7002cdd526ae84fbacbf153162e118f22580
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/heimdal/heimdal/security/advisories/GHSA-69h9-669w-88xv
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-14T15:56:38Z/ Found at https://github.com/heimdal/heimdal/security/advisories/GHSA-69h9-669w-88xv
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-44758
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://security.gentoo.org/glsa/202310-06
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-14T15:56:38Z/ Found at https://security.gentoo.org/glsa/202310-06
Exploit Prediction Scoring System (EPSS)
Percentile 0.54824
EPSS Score 0.00325
Published At Sept. 9, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:31:03.207698+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.16/main.json 37.0.0