ubuntu-cve-2021-40648
Vulnerability from osv_ubuntu
Published
2022-09-09 18:15
Modified
2026-05-20 14:53
Summary
Details
In man2html 1.6g, a filename can be created to overwrite the previous size parameter of the next chunk and the fd, bk, fd_nextsize, bk_nextsize of the current chunk. The next chunk is then freed later on, causing a freeing of an arbitrary amount of memory.
Severity
5.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "man2html",
"binary_version": "1.6g-8"
},
{
"binary_name": "man2html-base",
"binary_version": "1.6g-8"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "man2html",
"purl": "pkg:deb/ubuntu/man2html@1.6g-8?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.6g-7",
"1.6g-8"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "man2html",
"binary_version": "1.6g-11"
},
{
"binary_name": "man2html-base",
"binary_version": "1.6g-11"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "man2html",
"purl": "pkg:deb/ubuntu/man2html@1.6g-11?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.6g-9",
"1.6g-9ubuntu1",
"1.6g-11"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "man2html",
"binary_version": "1.6g-12"
},
{
"binary_name": "man2html-base",
"binary_version": "1.6g-12"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "man2html",
"purl": "pkg:deb/ubuntu/man2html@1.6g-12?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.6g-12"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "man2html",
"binary_version": "1.6g-14"
},
{
"binary_name": "man2html-base",
"binary_version": "1.6g-14"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "man2html",
"purl": "pkg:deb/ubuntu/man2html@1.6g-14?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.6g-14"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "man2html",
"binary_version": "1.6g-16"
},
{
"binary_name": "man2html-base",
"binary_version": "1.6g-16"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "man2html",
"purl": "pkg:deb/ubuntu/man2html@1.6g-16?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.6g-14",
"1.6g-15",
"1.6g-16"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "man2html",
"binary_version": "1.6g-16"
},
{
"binary_name": "man2html-base",
"binary_version": "1.6g-16"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "man2html",
"purl": "pkg:deb/ubuntu/man2html@1.6g-16?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.6g-16"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "man2html",
"binary_version": "1.6g-16build1"
},
{
"binary_name": "man2html-base",
"binary_version": "1.6g-16build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "man2html",
"purl": "pkg:deb/ubuntu/man2html@1.6g-16build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.6g-16",
"1.6g-16build1"
]
}
],
"aliases": [],
"details": "In man2html 1.6g, a filename can be created to overwrite the previous size parameter of the next chunk and the fd, bk, fd_nextsize, bk_nextsize of the current chunk. The next chunk is then freed later on, causing a freeing of an arbitrary amount of memory.",
"id": "UBUNTU-CVE-2021-40648",
"modified": "2026-05-20T14:53:33Z",
"published": "2022-09-09T18:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-40648"
},
{
"type": "REPORT",
"url": "https://gist.github.com/untaman/cb58123fe89fc65e3984165db5d40933"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-40648"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-40648"
]
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…