CVE-2017-7797
This allows stored header names to be available cross-origin.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.77%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Response header name interning does not have same-origin protections and these headers are stored in a global registry. This allows stored header names to be available cross-origin. This vulnerability affects Firefox < 55.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.77% probability · 55th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-346
- Affected
- mozilla/firefox
- Source
- security@mozilla.org
EPSS 0.8% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securitytracker.com/id/1039124Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1334776Exploit, Issue Tracking, Patch
- https://www.mozilla.org/security/advisories/mfsa2017-18/Vendor Advisory
- http://www.securitytracker.com/id/1039124Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1334776Exploit, Issue Tracking, Patch
- https://www.mozilla.org/security/advisories/mfsa2017-18/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.