What is CVE-2016-1963?

CVE-2016-1963 is a high-severity vulnerability in Mozilla Firefox, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.4/10. Published 2016-03-13.

How severe is CVE-2016-1963?

High severity. CVSS v3 base score is 7.4 out of 10.

Buffer overflow in Mozilla Firefox

CVE-2016-1963

The FileReader class in Mozilla Firefox before 45.0 allows local users to gain privileges or cause a denial of service (memory corruption) by changing a file during a FileReader API read operation.

Vulnerability class: Buffer Overflow

Published 2016-03-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (20.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Mozilla Firefox

Weakness classification (CWE)

References

bugzilla.mozilla.org/show_bug.cgi
lists.opensuse.org/opensuse-security-announce/2016-03/msg00029.html (vendor-advisory)
www.ubuntu.com/usn/USN-2917-1 (vendor-advisory)
www.mozilla.org/security/announce/2016/mfsa2016-26.html (Vendor Advisory)
lists.opensuse.org/opensuse-security-announce/2016-03/msg00031.html (vendor-advisory)
www.securitytracker.com/id/1035215 (vdb-entry)
security.gentoo.org/glsa/201605-06 (vendor-advisory)
www.ubuntu.com/usn/USN-2917-2 (vendor-advisory)
www.ubuntu.com/usn/USN-2917-3 (vendor-advisory)

Frequently asked questions

What is CVE-2016-1963?: CVE-2016-1963 is a high-severity vulnerability in Mozilla Firefox, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.4/10. Published 2016-03-13.
How severe is CVE-2016-1963?: High severity. CVSS v3 base score is 7.4 out of 10.