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CVE Record

CVE-2021-33880: The aaugustin websockets library before 9.1 for Python has an Observable Timing Discrepancy on servers when...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-33880 affects Python servers using the aaugustin websockets library before 9.1 with HTTP Basic Authentication enabled. A timing difference may help an attacker guess passwords. Exposure is specific, not universal across all websockets users.

Executive priority

Treat this as a targeted authentication-hardening issue. Prioritize internet-facing services or products carrying the vulnerable dependency, but avoid emergency posture unless local exposure is confirmed.

Technical view

The flaw is an observable timing discrepancy in websockets servers configured with basic_auth_protocol_factory(credentials=...). The CVE states versions before 9.1 are affected and that an attacker may be able to guess a password through timing analysis.

Likely exposure

Exposure is likely limited to Python applications using websockets before 9.1 and enabling HTTP Basic Authentication through the named factory. The source bundle does not identify CPEs or a complete affected product list.

Exploitation context

The CVE record says password guessing may be possible via timing attack. The source bundle marks KEV as false and provides no cited evidence of active exploitation or public weaponization.

Researcher notes

The public bundle lacks CVSS, CWE, CPEs, and detailed exploit evidence. Analysis should stay constrained to the named library version range and Basic Auth configuration. Oracle advisories are references, but affected Oracle components are not enumerated here.

Mitigation direction

  • Upgrade the Python websockets library to version 9.1 or later where feasible.
  • Identify any servers using basic_auth_protocol_factory(credentials=...).
  • Rotate exposed Basic Auth credentials if compromise is suspected.
  • Check Oracle CPU advisories if Oracle products in your environment include this dependency.
  • Review vendor guidance before applying product-specific fixes.

Validation and detection

  • Inventory Python dependencies for websockets versions below 9.1.
  • Confirm whether HTTP Basic Authentication is enabled through basic_auth_protocol_factory.
  • Map affected services to internet-facing and internal exposure.
  • Review authentication logs for unusual repeated failures.
  • Verify upgraded services no longer use the affected library version.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2021-33880 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.