What is CVE-2016-9074?

CVE-2016-9074 is a medium-severity vulnerability in Mozilla Firefox, classified under Information Disclosure. CVSS score: 5.9/10. Published 2018-06-11.

How severe is CVE-2016-9074?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Is CVE-2016-9074 known to be exploited?

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

Information disclosure in Mozilla Firefox

CVE-2016-9074

An existing mitigation of timing side-channel attacks is insufficient in some circumstances. This issue is addressed in Network Security Services (NSS) 3.26.1. This vulnerability affects Thunderbird < 45.5, Firefox ESR < 45.5, and Firefox < 50.

Vulnerability class: Information Disclosure

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

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.024 (83.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: -0.000

Affected products

Mozilla Firefox — versions unspecified
Mozilla Firefox Esr — versions unspecified
Mozilla Thunderbird — versions unspecified
Debian Linux — versions 8.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

www.debian.org/security/2016/dsa-3730 (vendor-advisory, Third Party Advisory)
bugzilla.mozilla.org/show_bug.cgi (Issue Tracking, Vendor Advisory)
security.gentoo.org/glsa/201701-46 (vendor-advisory, Third Party Advisory)
www.securityfocus.com/bid/94341 (VDB Entry, Third Party Advisory, vdb-entry)
www.securitytracker.com/id/1037298 (VDB Entry, Third Party Advisory, vdb-entry)
security.gentoo.org/glsa/201701-15 (vendor-advisory, Third Party Advisory)
www.mozilla.org/security/advisories/mfsa2016-93/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2016-89/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2016-90/ (Vendor Advisory)

Frequently asked questions

What is CVE-2016-9074?: CVE-2016-9074 is a medium-severity vulnerability in Mozilla Firefox, classified under Information Disclosure. CVSS score: 5.9/10. Published 2018-06-11.
How severe is CVE-2016-9074?: Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2016-9074 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.