Proxy Auto-Config (PAC) files can specify a JavaScript function called for all URL requests with the full URL path which exposes more…

Description

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.

Scores

EPSS (exploitation in 30 days)

1.5% · top 26% of all CVEs (3 Nov 2026)

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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.

Weakness

• Information disclosure via Proxy Auto-Config (PAC)
• CWE-200 (opens in a new tab)Other CVEs with CWE-200

Affected products

• Mozilla · Firefox

  • affected unspecified – < 51

References (5)

• https://www.contextis.com//resources/blog/leaking-https-urls-20-year-old-vulnerability/ (opens in a new tab)x_refsource_MISCx_transferred
• https://bugzilla.mozilla.org/show_bug.cgi?id=1255474 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 1037693 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
• https://www.mozilla.org/security/advisories/mfsa2017-01/ (opens in a new tab)x_refsource_CONFIRMx_transferred
• 95763 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2017-5384](https://trackcve.app/badge/CVE-2017-5384.svg)](https://trackcve.app/cve/CVE-2017-5384)

Record last updated 5 Aug 2024, 14:55 UTC.