What is CVE-2017-5377?

CVE-2017-5377 is a critical-severity vulnerability in Mozilla Firefox, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2018-06-11.

How severe is CVE-2017-5377?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Mozilla Firefox

CVE-2017-5377

A memory corruption vulnerability in Skia that can occur when using transforms to make gradients, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 51.

Vulnerability class: Buffer Overflow

Published 2018-06-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (75.5th percentile), scored 2026-10-06.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Mozilla Firefox — versions unspecified

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

www.securitytracker.com/id/1037693 (VDB Entry, Third Party Advisory, vdb-entry)
www.mozilla.org/security/advisories/mfsa2017-01/ (Vendor Advisory)
www.securityfocus.com/bid/95761 (VDB Entry, Third Party Advisory, vdb-entry)
bugzilla.mozilla.org/show_bug.cgi (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2017-5377?: CVE-2017-5377 is a critical-severity vulnerability in Mozilla Firefox, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2018-06-11.
How severe is CVE-2017-5377?: Critical severity. CVSS v3 base score is 9.8 out of 10.