What’s Vulnerable › Vulnerabilities

CVE-2021-33880

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-06 · updated 2026-06-17
• Weakness: CWE-203

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.

Affected products

• Oracle Communications Cloud Native Core Policy: 1.14.0
• Oracle Communications Cloud Native Core Security Edge Protection Proxy: 1.5.0
• Oracle Communications Cloud Native Core Service Communication Proxy: 1.14.0
• Oracle Communications Cloud Native Core Unified Data Repository: 1.14.0
• Websockets Project Websockets: before 9.1 — fixed in 9.1

How to fix

Upgrade to a fixed version: Websockets Project Websockets 9.1. Check the vendor advisory for mitigations.

References

• https://github.com/aaugustin/websockets/commit/547a26b685d08cac0aa64e5e65f7867ac0ea9bc0
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpujan2022.html
• https://github.com/aaugustin/websockets/commit/547a26b685d08cac0aa64e5e65f7867ac0ea9bc0
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpujan2022.html

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