CVE-2021-3737
HIGH7.5EPSS 0.12%Published: 3/4/2022Modified: 4/28/2026
Description
A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability.
Affected packages (6)
- Bitnami/libpython>= 3.6.0, < 3.6.14, >= 3.7.0, < 3.7.11, >= 3.8.0, < 3.8.11, >= 3.9.0, < 3.9.6
- Bitnami/python>= 3.6.0, < 3.6.14, >= 3.7.0, < 3.7.11, >= 3.8.0, < 3.8.11, >= 3.9.0, < 3.9.6
- Bitnami/python-min>= 3.6.0, < 3.6.14, >= 3.7.0, < 3.7.11, >= 3.8.0, < 3.8.11, >= 3.9.0, < 3.9.6
- Debian/pypy3from 0, < 7.3.5+dfsg-2+deb11u4
- Debian/python2.7from 0
- Debian/python3.9from 0, < 3.9.2-1+deb11u2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References (14)
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-3737
- WEBhttps://bugs.python.org/issue44022
- WEBhttps://bugzilla.redhat.com/show_bug.cgi?id=1995162
- WEBhttps://github.com/python/cpython/pull/25916
- WEBhttps://github.com/python/cpython/pull/26503
- WEBhttps://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- WEBhttps://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
- WEBhttps://lists.debian.org/debian-lts-announce/2024/11/msg00024.html
- WEBhttps://lists.debian.org/debian-lts-announce/2024/12/msg00000.html
- WEBhttps://nvd.nist.gov/vuln/detail/CVE-2021-3737
- WEBhttps://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html
- WEBhttps://security.netapp.com/advisory/ntap-20220407-0009/
- WEBhttps://ubuntu.com/security/CVE-2021-3737
- WEBhttps://www.oracle.com/security-alerts/cpujul2022.html