{"id":"CVE-2021-29416","aliases":["EUVD-2021-16051","GHSA-r2r7-rw7m-4rmc"],"status":"published","title":"An issue was discovered in PortSwigger Burp Suite before 2021.2. During viewing of a malicious...","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.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.0119,"percentile":0.68212,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-74"],"published":"2021-03-29T17:51:15Z","modified":"2026-06-17T03:47:35Z","products":[{"vendor":"portswigger","product":"burp_suite"}],"references":[{"url":"https://hackerone.com/reports/1054382","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory"]},{"url":"https://portswigger.net/burp/releases/professional-community-2020-12?requestededition=professional","tags":["x_refsource_MISC","x_transferred","Release Notes","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29416"},{"url":"https://github.com/advisories/GHSA-r2r7-rw7m-4rmc"}],"sources":{"cve":[{"id":"CVE-2021-29416","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.","status":"published","published":"2021-03-29T17:51:15Z","modified":"2024-08-03T22:02:51.883Z","updated_at":"2026-11-02T14:33:06.32268Z"}],"euvd":[{"id":"EUVD-2021-16051","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.","status":"published","published":"2021-03-29T17:51:15Z","modified":"2024-08-03T22:02:51Z","updated_at":"2026-11-03T03:24:45.000012Z"}],"ghsa":[{"id":"GHSA-r2r7-rw7m-4rmc","title":"An issue was discovered in PortSwigger Burp Suite before 2021.2. During viewing of a malicious...","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.","status":"published","published":"2022-05-24T17:45:40Z","modified":"2023-01-27T05:02:58Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-74"],"updated_at":"2026-11-02T14:42:08.614878Z"}],"nvd":[{"id":"CVE-2021-29416","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.","status":"published","published":"2021-03-29T18:15:13.407Z","modified":"2026-06-17T03:47:35.953Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:51.197859Z"}]}}