ubuntu-cve-2021-43533
Vulnerability from osv_ubuntu
Published
2021-12-08 22:15
Modified
2025-07-16 04:57
Summary
Details
When parsing internationalized domain names, high bits of the characters in the URLs were sometimes stripped, resulting in inconsistencies that could lead to user confusion or attacks such as phishing. This vulnerability affects Firefox < 94.
Severity
4.3 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "firefox",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-dbg",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-dev",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-geckodriver",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-af",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-an",
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},
{
"binary_name": "firefox-locale-ar",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-as",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-ast",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-az",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-be",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-bg",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-bn",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-br",
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},
{
"binary_name": "firefox-locale-bs",
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},
{
"binary_name": "firefox-locale-ca",
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{
"binary_name": "firefox-locale-cak",
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},
{
"binary_name": "firefox-locale-cs",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-csb",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-cy",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-da",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-de",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-el",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-en",
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},
{
"binary_name": "firefox-locale-eo",
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},
{
"binary_name": "firefox-locale-es",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-et",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-eu",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-fa",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-fi",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-fr",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-fy",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-ga",
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},
{
"binary_name": "firefox-locale-gd",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-gl",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-gn",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-gu",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-he",
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},
{
"binary_name": "firefox-locale-hi",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-hr",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-hsb",
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},
{
"binary_name": "firefox-locale-hu",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-hy",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-ia",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-id",
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},
{
"binary_name": "firefox-locale-is",
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},
{
"binary_name": "firefox-locale-it",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-ja",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-ka",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-kab",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-kk",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-km",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-kn",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-ko",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-ku",
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},
{
"binary_name": "firefox-locale-lg",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-lt",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-lv",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-mai",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-mk",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
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{
"binary_name": "firefox-locale-ml",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-mn",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-mr",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-ms",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-my",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-nb",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
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{
"binary_name": "firefox-locale-ne",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-nl",
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{
"binary_name": "firefox-locale-nn",
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{
"binary_name": "firefox-locale-nso",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-oc",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-or",
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{
"binary_name": "firefox-locale-pa",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-pl",
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{
"binary_name": "firefox-locale-pt",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
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{
"binary_name": "firefox-locale-ro",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
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{
"binary_name": "firefox-locale-ru",
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},
{
"binary_name": "firefox-locale-si",
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},
{
"binary_name": "firefox-locale-sk",
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{
"binary_name": "firefox-locale-sl",
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},
{
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{
"binary_name": "firefox-locale-sr",
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{
"binary_name": "firefox-locale-sv",
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{
"binary_name": "firefox-locale-sw",
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{
"binary_name": "firefox-locale-szl",
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{
"binary_name": "firefox-locale-ta",
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},
{
"binary_name": "firefox-locale-te",
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{
"binary_name": "firefox-locale-th",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-tr",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-uk",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
},
{
"binary_name": "firefox-locale-ur",
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{
"binary_name": "firefox-locale-uz",
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{
"binary_name": "firefox-locale-vi",
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{
"binary_name": "firefox-locale-xh",
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{
"binary_name": "firefox-locale-zh-hans",
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{
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{
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{
"binary_name": "firefox-mozsymbols",
"binary_version": "94.0+build3-0ubuntu0.18.04.1"
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]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "firefox",
"purl": "pkg:deb/ubuntu/firefox@94.0+build3-0ubuntu0.18.04.1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "94.0+build3-0ubuntu0.18.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
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"57.0.1+build2-0ubuntu1",
"59.0.1+build1-0ubuntu1",
"59.0.2+build1-0ubuntu1",
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]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
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"binary_version": "94.0+build3-0ubuntu0.20.04.1"
},
{
"binary_name": "firefox-dbg",
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},
{
"binary_name": "firefox-dev",
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},
{
"binary_name": "firefox-geckodriver",
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},
{
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},
{
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{
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{
"binary_name": "firefox-locale-as",
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{
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{
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{
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},
{
"binary_name": "firefox-locale-bg",
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},
{
"binary_name": "firefox-locale-bn",
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{
"binary_name": "firefox-locale-br",
"binary_version": "94.0+build3-0ubuntu0.20.04.1"
},
{
"binary_name": "firefox-locale-bs",
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{
"binary_name": "firefox-locale-ca",
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{
"binary_name": "firefox-locale-cak",
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{
"binary_name": "firefox-locale-cs",
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{
"binary_name": "firefox-locale-csb",
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},
{
"binary_name": "firefox-locale-cy",
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},
{
"binary_name": "firefox-locale-da",
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},
{
"binary_name": "firefox-locale-de",
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},
{
"binary_name": "firefox-locale-el",
"binary_version": "94.0+build3-0ubuntu0.20.04.1"
},
{
"binary_name": "firefox-locale-en",
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},
{
"binary_name": "firefox-locale-eo",
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{
"binary_name": "firefox-locale-es",
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{
"binary_name": "firefox-locale-et",
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{
"binary_name": "firefox-locale-eu",
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{
"binary_name": "firefox-locale-fa",
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{
"binary_name": "firefox-locale-fi",
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{
"binary_name": "firefox-locale-fr",
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{
"binary_name": "firefox-locale-fy",
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{
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{
"binary_name": "firefox-locale-gd",
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{
"binary_name": "firefox-locale-gl",
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{
"binary_name": "firefox-locale-gn",
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],
"aliases": [],
"details": "When parsing internationalized domain names, high bits of the characters in the URLs were sometimes stripped, resulting in inconsistencies that could lead to user confusion or attacks such as phishing. This vulnerability affects Firefox \u003c 94.",
"id": "UBUNTU-CVE-2021-43533",
"modified": "2025-07-16T04:57:37Z",
"published": "2021-12-08T22:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-43533"
},
{
"type": "REPORT",
"url": "https://www.mozilla.org/en-US/security/advisories/mfsa2021-48/#CVE-2021-43533"
},
{
"type": "REPORT",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1724233"
},
{
"type": "REPORT",
"url": "https://www.mozilla.org/security/advisories/mfsa2021-48/"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-43533"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-43533"
],
"withdrawn": "2025-07-18T16:47:03Z"
}
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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.
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