Memory safety bugs were reported in Firefox 51.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

No source has published a CVSS score for this record yet.

• CISA KEV Not listed.
• EPSS 0.023, the 83rd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 11 Jun 2018. New records show when each source confirmed them.

Sources

• CVE List: CVE-2017-5399
• NVD: CVE-2017-5399

References from the CNA

• bugzilla.mozilla.org/buglist.cgi?bug_id=1332569%2C1315248%2C1261335%2C1321038%2C1331771%2C1339566%2C1339591%2C1240893%2C1341905%2C1323241%2C1336467%2C1270288%2C1295299%2C1296024%2C1304201%2C1306142%2C1307557%2C1308036%2C1334246%2C1334290%2C1317085%2C1339116%2C1324000%2C1323150%2C1332501%2C1320894%2C1333752%2C1303713%2C1321566%2C1264053%2C1343513 confirm
• www.mozilla.org/security/advisories/mfsa2017-09/ confirm
• www.mozilla.org/security/advisories/mfsa2017-05/ confirm
• www.securitytracker.com/id/1037966 vdb-entrysectrack
• www.securityfocus.com/bid/96692 vdb-entrybid

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.