CVE-2021-3733
- Source
- https://cve.org/CVERecord?id=CVE-2021-3733
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3733.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-3733
- Aliases
- Downstream
- Related
- Published
- 2022-03-10T17:42:59.623Z
- Modified
- 2026-03-15T22:38:01.486524Z
- Severity
-
- 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.
- References
-
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
- https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html
- https://security.netapp.com/advisory/ntap-20220407-0001/
- https://bugzilla.redhat.com/show_bug.cgi?id=1995234
- https://github.com/python/cpython/pull/24391
- https://bugs.python.org/issue43075
- https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb
- https://ubuntu.com/security/CVE-2021-3733
Affected packages
Git / github.com/python/cpython
Affected ranges
- Type
- GIT
- Repo
- https://github.com/python/cpython
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedIntroducedFixedIntroducedFixedIntroducedFixedIntroduced0 Unknown introduced commit / All previous commits are affectedLast affectedFixed
- Database specific
{ "versions": [ { "introduced": "0" }, { "fixed": "3.6.14" }, { "introduced": "3.7.0" }, { "fixed": "3.7.11" }, { "introduced": "3.8.0" }, { "fixed": "3.8.10" }, { "introduced": "3.9.0" }, { "fixed": "3.9.5" }, { "introduced": "0" }, { "last_affected": "3.10.0-NA" } ] }
Database specific
unresolved_ranges
[
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.0"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.0"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.0"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.0"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.4"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.0"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.4"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.0"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.4"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.4"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.4"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.4"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "8.4"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "7.0"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "33"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "34"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "35"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "36"
}
]
}
]
source
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3733.json"