HighFix available
heimdal — security advisory
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.
- Products
- heimdal
- Affected versions
- 1.6~git20120403+dfsg1-3ubuntu0.1, 1.6~git20120403+dfsg1-3ubuntu0.2, 1.6~git20131207+dfsg-1ubuntu1, 1.6~git20131207+dfsg-1ubuntu1.1, 1.6~git20131207+dfsg-1ubuntu1.2, 1.6~git20131207+dfsg-1ubuntu1.2+esm1, 1.6~git20131207+dfsg-1ubuntu1.2+esm2, 1.6~rc2+dfsg-10ubuntu1, 1.7~git20150920+dfsg-4ubuntu1, 1.7~git20150920+dfsg-4ubuntu1.16.04.1, 1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1, 1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm2, 7.4.0.dfsg.1-2, 7.5.0+dfsg-1, 7.5.0+dfsg-1ubuntu0.1, 7.5.0+dfsg-1ubuntu0.2, 7.5.0+dfsg-3build1, 7.7.0+dfsg-1, 7.7.0+dfsg-1ubuntu1, 7.7.0+dfsg-1ubuntu1.1, 7.7.0+dfsg-1ubuntu1.2, 7.7.0+dfsg-2ubuntu2, 7.7.0+dfsg-3ubuntu1, 7.8.git20221117.28daf24+dfsg-10ubuntu1, 7.8.git20221117.28daf24+dfsg-11ubuntu1, 7.8.git20221117.28daf24+dfsg-12ubuntu1, 7.8.git20221117.28daf24+dfsg-3ubuntu1, 7.8.git20221117.28daf24+dfsg-3ubuntu2, 7.8.git20221117.28daf24+dfsg-3ubuntu3, 7.8.git20221117.28daf24+dfsg-3ubuntu4, 7.8.git20221117.28daf24+dfsg-4ubuntu1, 7.8.git20221117.28daf24+dfsg-5ubuntu2, 7.8.git20221117.28daf24+dfsg-5ubuntu3, 7.8.git20221117.28daf24+dfsg-9ubuntu1, 7.8.git20240113.1b4565a+dfsg-1ubuntu1, 7.8.git20240113.1b4565a+dfsg-1ubuntu2, 7.8.git20240113.1b4565a+dfsg-2ubuntu1
- Fixed versions
- 1.6~git20131207+dfsg-1ubuntu1.2+esm3, 1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3, 7.5.0+dfsg-1ubuntu0.3, 7.7.0+dfsg-1ubuntu1.3
- CVEs
- CVE-2021-44758
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:35 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2021-44758
heimdal
Fixed versions: 1.6~git20131207+dfsg-1ubuntu1.2+esm3
heimdal
Fixed versions: 1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3
heimdal
Fixed versions: 7.5.0+dfsg-1ubuntu0.3
heimdal
Fixed versions: 7.7.0+dfsg-1ubuntu1.3
heimdal
Fixed versions: Not specified
heimdal
Fixed versions: Not specified
heimdal
Fixed versions: Not specified
heimdal
Fixed versions: Not specified
heimdal
Fixed versions: Not specified
Complete source record
{
"id": "e3ba4df7a9faf7583ff05e75e6670aa37e065ef75fb62e573f6fdee49d7517f2",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-44758",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-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.",
"evidence": "osv:UBUNTU-CVE-2021-44758",
"products": [
{
"name": {
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"evidence": "/affected/0/package/name"
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{
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{
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{
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{
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{
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"affected_versions": [
{
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{
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{
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{
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"evidence": "/affected/2/ranges"
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],
"affected_versions": [
{
"value": "7.4.0.dfsg.1-2",
"evidence": "/affected/2/versions"
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{
"value": "7.5.0+dfsg-1",
"evidence": "/affected/2/versions"
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{
"value": "7.5.0+dfsg-1ubuntu0.1",
"evidence": "/affected/2/versions"
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{
"value": "7.5.0+dfsg-1ubuntu0.2",
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{
"name": {
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"evidence": "/affected/3/package/name"
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"prerequisites": [],
"fixed_versions": [
{
"value": "7.7.0+dfsg-1ubuntu1.3",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": [
{
"value": "7.5.0+dfsg-3build1",
"evidence": "/affected/3/versions"
},
{
"value": "7.7.0+dfsg-1",
"evidence": "/affected/3/versions"
},
{
"value": "7.7.0+dfsg-1ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "7.7.0+dfsg-1ubuntu1.1",
"evidence": "/affected/3/versions"
},
{
"value": "7.7.0+dfsg-1ubuntu1.2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "heimdal",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "7.7.0+dfsg-2ubuntu2",
"evidence": "/affected/4/versions"
},
{
"value": "7.7.0+dfsg-3ubuntu1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "heimdal",
"evidence": "/affected/5/package/name"
},
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"fixed_versions": [],
"affected_versions": [
{
"value": "7.8.git20221117.28daf24+dfsg-3ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "7.8.git20221117.28daf24+dfsg-3ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "7.8.git20221117.28daf24+dfsg-3ubuntu3",
"evidence": "/affected/5/versions"
},
{
"value": "7.8.git20221117.28daf24+dfsg-3ubuntu4",
"evidence": "/affected/5/versions"
},
{
"value": "7.8.git20221117.28daf24+dfsg-4ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "7.8.git20221117.28daf24+dfsg-5ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "7.8.git20221117.28daf24+dfsg-5ubuntu3",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "heimdal",
"evidence": "/affected/6/package/name"
},
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{
"value": "7.8.git20221117.28daf24+dfsg-9ubuntu1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "heimdal",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "7.8.git20221117.28daf24+dfsg-11ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "7.8.git20221117.28daf24+dfsg-12ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "7.8.git20240113.1b4565a+dfsg-1ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "7.8.git20240113.1b4565a+dfsg-1ubuntu2",
"evidence": "/affected/7/versions"
},
{
"value": "7.8.git20240113.1b4565a+dfsg-2ubuntu1",
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{
"name": {
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},
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{
"value": "7.8.git20221117.28daf24+dfsg-9ubuntu1",
"evidence": "/affected/8/versions"
},
{
"value": "7.8.git20221117.28daf24+dfsg-10ubuntu1",
"evidence": "/affected/8/versions"
},
{
"value": "7.8.git20221117.28daf24+dfsg-11ubuntu1",
"evidence": "/affected/8/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2021-44758",
"aliases": [
"UBUNTU-CVE-2021-44758"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
}
]
}
],
"package": {
"name": "heimdal",
"purl": "pkg:deb/ubuntu/heimdal?arch=source&distro=trusty%2Fesm",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"1.6~git20120403+dfsg1-3ubuntu0.1",
"1.6~git20120403+dfsg1-3ubuntu0.2",
"1.6~git20131207+dfsg-1ubuntu1",
"1.6~git20131207+dfsg-1ubuntu1.1",
"1.6~git20131207+dfsg-1ubuntu1.2",
"1.6~git20131207+dfsg-1ubuntu1.2+esm1",
"1.6~git20131207+dfsg-1ubuntu1.2+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44758.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "heimdal-clients",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "heimdal-clients-x",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "heimdal-docs",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "heimdal-kcm",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "heimdal-kdc",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "heimdal-multidev",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "heimdal-servers",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "heimdal-servers-x",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libasn1-8-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libgssapi3-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libhcrypto4-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libhdb9-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libheimbase1-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libheimntlm0-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libhx509-5-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libkadm5clnt7-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libkadm5srv8-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libkafs0-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libkdc2-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libkrb5-26-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libotp0-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libroken18-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libsl0-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
},
{
"binary_name": "libwind0-heimdal",
"binary_version": "1.6~git20131207+dfsg-1ubuntu1.2+esm3"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
}
]
}
],
"package": {
"name": "heimdal",
"purl": "pkg:deb/ubuntu/heimdal?arch=source&distro=esm-infra%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"1.6~rc2+dfsg-10ubuntu1",
"1.7~git20150920+dfsg-4ubuntu1",
"1.7~git20150920+dfsg-4ubuntu1.16.04.1",
"1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1",
"1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44758.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "heimdal-clients",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "heimdal-docs",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "heimdal-kcm",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "heimdal-kdc",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "heimdal-multidev",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "heimdal-servers",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libasn1-8-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libgssapi3-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libhcrypto4-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libhdb9-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libheimbase1-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libheimntlm0-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libhx509-5-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libkadm5clnt7-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libkadm5srv8-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libkafs0-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libkdc2-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libkrb5-26-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libotp0-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libroken18-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libsl0-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
},
{
"binary_name": "libwind0-heimdal",
"binary_version": "1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.5.0+dfsg-1ubuntu0.3"
}
]
}
],
"package": {
"name": "heimdal",
"purl": "pkg:deb/ubuntu/heimdal?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"7.4.0.dfsg.1-2",
"7.5.0+dfsg-1",
"7.5.0+dfsg-1ubuntu0.1",
"7.5.0+dfsg-1ubuntu0.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44758.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "heimdal-clients",
"binary_version": "7.5.0+dfsg-1ubuntu0.3"
},
{
"binary_name": "heimdal-docs",
"binary_version": "7.5.0+dfsg-1ubuntu0.3"
},
{
"binary_name": "heimdal-kcm",
"binary_version": "7.5.0+dfsg-1ubuntu0.3"
},
{
"binary_name": "heimdal-kdc",
"binary_version": "7.5.0+dfsg-1ubuntu0.3"
},
{
"binary_name": "heimdal-multidev",
"binary_version": "7.5.0+dfsg-1ubuntu0.3"
},
{
"binary_name": "heimdal-servers",
"binary_version": "7.5.0+dfsg-1ubuntu0.3"
},
{
"binary_name": "libasn1-8-heimdal",
"binary_version": "7.5.0+dfsg-1ubuntu0.3"
},
{
"binary_name": "libgssapi3-heimdal",
"binary_version": "7.5.0+dfsg-1ubuntu0.3"
},
{
"binary_name": "libhcrypto4-heimdal",
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],
"modified": "2026-10-17T12:55:47.556066363Z",
"provider": "osv",
"upstream": [
"CVE-2021-44758"
],
"references": [
"https://ubuntu.com/security/CVE-2021-44758",
"https://github.com/heimdal/heimdal/security/advisories/GHSA-69h9-669w-88xv",
"https://ubuntu.com/security/notices/USN-5800-1",
"https://www.cve.org/CVERecord?id=CVE-2021-44758"
]
},
"related_cves": [
{
"value": "CVE-2021-44758",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 354095,
"published_at": "2022-12-26T05:15:00+00:00"
}