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No exploitation reportedFix available

CVE-2021-33880

No exploitation reported by the sources we read.

  • Published2021-06-06
  • WeaknessCWE-203

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-06-0615:15CVE publishedNVD

Versions per branch

NVD
Oracle communications cloud native core policy
BranchAffectedFixed in
1.14= 1.14.0no fix published
Oracle communications cloud native core security edge protection proxy
BranchAffectedFixed in
1.5= 1.5.0no fix published
Oracle communications cloud native core service communication proxy
BranchAffectedFixed in
1.14= 1.14.0no fix published

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • python-websocketsUbuntu:26.10all versions · no fixed version listed
  • python-websocketsUbuntu:26.04:LTSall versions · no fixed version listed
  • python-websocketsUbuntu:25.10all versions · no fixed version listed
  • python-websocketsUbuntu:24.04:LTSall versions · no fixed version listed
  • python-websocketsUbuntu:22.04:LTSall versions · no fixed version listed
  • python-websocketsUbuntu:20.04:LTSall versions · no fixed version listed
  • python-websocketsUbuntu:18.04:LTSall versions · no fixed version listed
  • python-websocketsUbuntu:16.04:LTSall versions · no fixed version listed

4 more package ranges on OSV.dev

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2021-06-06
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-8ch4-58qp-g3mp

Frequently asked questions

What is CVE-2021-33880?

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.

Is CVE-2021-33880 actively exploited?

Active exploitation of CVE-2021-33880 has not been confirmed. Its EPSS score was 2.3% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-33880?

CVE-2021-33880 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

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Sources for this record