What is CVE-2017-7776?

CVE-2017-7776 is a high-severity vulnerability in Mozilla Firefox, classified under Out-of-bounds Read. CVSS score: 8.1/10. Published 2019-04-15.

How severe is CVE-2017-7776?

High severity. CVSS v3 base score is 8.1 out of 10.

Is CVE-2017-7776 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Out-of-bounds Read in Mozilla Firefox

CVE-2017-7776

Heap-based Buffer Overflow read in Graphite2 library in Firefox before 54 in graphite2::Silf::getClassGlyph.

Vulnerability class: Buffer Overflow

Published 2019-04-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.028 (85.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 85.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: 0.000

Affected products

Mozilla Firefox — versions All versions prior to Firefox 54
Sil Graphite2

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

www.mozilla.org/en-US/security/advisories/mfsa2017-15/ (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2017-7776?: CVE-2017-7776 is a high-severity vulnerability in Mozilla Firefox, classified under Out-of-bounds Read. CVSS score: 8.1/10. Published 2019-04-15.
How severe is CVE-2017-7776?: High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2017-7776 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.