CVE catalog
CVE-2021-33880
python-websockets: CVE-2021-33880
- Severity
- Medium · CVSS 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 2.27% · Oct 25, 2026
The aaugustin websockets library before 9.1 for Python has an Observable Timing Discrepancy on servers when HTTP Basic Authentication is enabled with basic_auth_protocol_factory(credentials=...). An attacker may be able to guess a password via a timing attack.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | python-websockets | sid | 17.1-1 | fixed |
| Debian | python-websockets | forky | 17.1-1 | fixed |
| Debian | python-websockets | trixie | 15.0.1-1 | fixed |
| Debian | python-websockets | bookworm | 10.4-1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-websockets | source | sid | 9.1-1 | not yet assigned | Not reported | [989561] |
| Debian | python-websockets | source | forky | 9.1-1 | not yet assigned | Not reported | [989561] |
| Debian | python-websockets | source | trixie | 9.1-1 | not yet assigned | Not reported | [989561] |
| Debian | python-websockets | source | bookworm | 9.1-1 | not yet assigned | Not reported | [989561] |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-websockets]Fixed
Source package: [python-websockets]
Details (2)
10.4-1· all · bookwormFixed · Fixed:
9.1-1dsa · python-websockets · debian · bookworm; dsa · python-websockets · debian · 12
10.4-1· all · bookwormFixed · Fixed:
9.1-1dsa · python-websockets · debian · bookworm; dsa · python-websockets · debian · 12
[Debian 13 (Trixie)]
- [python3-websockets]Fixed
Source package: [python-websockets]
Details (2)
15.0.1-1· amd64 · trixieFixed · Fixed:
9.1-1dsa · python-websockets · debian · 13
15.0.1-1· arm64 · trixieFixed · Fixed:
9.1-1dsa · python-websockets · debian · 13
Observed:
References
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-33880]
- [https://security-tracker.debian.org/tracker/CVE-2021-33880]
- [https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-33880.json]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]