What’s Vulnerable › Vulnerabilities

CVE-2021-29416

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-29 · updated 2026-06-17

Description

An issue was discovered in PortSwigger Burp Suite before 2021.2. During viewing of a malicious request, it can be manipulated into issuing a request that does not respect its upstream proxy configuration. This could leak NetNTLM hashes on Windows systems that fail to block outbound SMB.

Affected products

• Tenable Burp Suite Community Edition: before 2021.2 — fixed in 2021.2

How to fix

Upgrade to a fixed version: Tenable Burp Suite Community Edition 2021.2. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/1054382
• https://portswigger.net/burp/releases/professional-community-2020-12?requestededition=professional
• https://hackerone.com/reports/1054382
• https://portswigger.net/burp/releases/professional-community-2020-12?requestededition=professional

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