CVE-2017-5384

5.9 mediumEPSS 1.5%

Proxy Auto-Config (PAC) files can specify a JavaScript function called for all URL requests with the full URL path which exposes more information than would be sent to the proxy itself in the case of HTTPS. Normally the Proxy Auto-Config file is specified by the user or machine owner and presumed to be non-malicious, but if a user has enabled Web Proxy Auto Detect (WPAD) this file can be served remotely. This vulnerability affects Firefox < 51.

Severity

CVSS 3.0

5.9 medium

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 1.5% chance of exploitation in the next 30 days; higher than 73% of CVEs (scores of 2026-10-31)
CWE: CWE-200
Published: 2018-06-11
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox

References

http://www.securityfocus.com/bid/95763
http://www.securitytracker.com/id/1037693
https://bugzilla.mozilla.org/show_bug.cgi?id=1255474
https://www.contextis.com//resources/blog/leaking-https-urls-20-year-old-vulnerability/
https://www.mozilla.org/security/advisories/mfsa2017-01/

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