An issue was discovered in PortSwigger Burp Suite before 2021.2.
Priority LOW 31Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.0119 68th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:portswigger:burp_suite:*:*:*:*:community:*:*:* | before 2021.2 | Vulnerable | PortSwigger |
| cpe:2.3:a:portswigger:burp_suite:*:*:*:*:professional:*:*:* | before 2021.2 | Vulnerable | PortSwigger |
- cpe:2.3:a:portswigger:burp_suite:*:*:*:*:community:*:*:* Versions before 2021.2 Vulnerable ·PortSwigger
- cpe:2.3:a:portswigger:burp_suite:*:*:*:*:professional:*:*:* Versions before 2021.2 Vulnerable ·PortSwigger
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-29416
- 2026-10-03 Alias added: GHSA-r2r7-rw7m-4rmc
References
More PortSwigger Burp Suite vulnerabilities
- TI-2018-01069 Improper certificate validation in Tenable Burp Suite Community Edition CVSS 3.0HIGH 7.4
- TI-2021-19920 PortSwigger Burp Suite Enterprise Edition before 2021.11 on Windows has weak file… CVSS 3.1MEDIUM 6.5
- TI-2018-07348 PortSwigger Burp Suite before 1.7.34 has Improper Certificate Validation of the… CVSS 3.0MEDIUM 5.9
- TI-2022-15982 A URL disclosure issue was discovered in Burp Suite before 2022.6. CVSS 3.1MEDIUM 4.3
Sources
- CVE-2021-29416 · CVE Program
- CVE-2021-29416 · NVD
- FIRST EPSS
- GHSA-r2r7-rw7m-4rmc · GitHub Advisory Database · CC BY 4.0
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