CVE-2016-1931

Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 44.0 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via vectors related to uninitialized memory encountered during brotli data compression, and other vectors.

Published: 2016-01-31 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-1931 is rated High Risk (69.8/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.54%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-1931

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-08-18 2.40% 2.54% +0.14%
2 2025-07-07 4.35% 2.40% -1.95%
3 2025-03-30 — 4.35% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-1931

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 6.0 [email protected]
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2016-1931

OS Trackers for CVE-2016-1931

vendor priority summary link
gentoo normal CVE-2016-1931: 1 GLSA(s) (201605-06), 6 atom(s) (dev-libs/nspr, dev-libs/nss, mail-client/thunderbird, mail-client/thunderbird-bin, www-client/firefox, www-client/firefox-bin); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2016-1931
redhat critical — https://access.redhat.com/security/cve/CVE-2016-1931
suse critical CVE-2016-1931 severity critical: SUSE including 59 source package names (MozillaFirefox-102.11.0-150200.152.87.1, MozillaFirefox-115.10.0-150200.152.134.1, …), 78 product×package rows across 28 product lines (SUSE Linux Enterprise Desktop 12 SP2, SUSE Linux Enterprise Desktop 12 SP3, … (28 product lines)): Fixed 78. https://www.suse.com/security/cve/CVE-2016-1931/
ubuntu medium CVE-2016-1931 medium priority: Ubuntu including 2 source packages (firefox, thunderbird), 10 status rows across 5 suites (precise, trusty, upstream, vivid, wily): released 5, not-affected 4, DNE 1. https://ubuntu.com/security/CVE-2016-1931

Affected software / configurations for CVE-2016-1931

Vendor Product Version Raw CPE
mozilla firefox <= 43.0.4 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
opensuse leap 42.1 cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
opensuse opensuse 13.1 cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
opensuse opensuse 13.2 cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*

References for CVE-2016-1931

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00002.html
http://www.mozilla.org/security/announce/2016/mfsa2016-01.html Vendor Advisory
http://www.securityfocus.com/bid/81953
http://www.securitytracker.com/id/1034825
http://www.ubuntu.com/usn/USN-2880-1
http://www.ubuntu.com/usn/USN-2880-2
https://bugzilla.mozilla.org/show_bug.cgi?id=1180064
https://bugzilla.mozilla.org/show_bug.cgi?id=1186973
https://bugzilla.mozilla.org/show_bug.cgi?id=1206675
https://bugzilla.mozilla.org/show_bug.cgi?id=1207298
https://bugzilla.mozilla.org/show_bug.cgi?id=1209358
https://bugzilla.mozilla.org/show_bug.cgi?id=1209365
https://bugzilla.mozilla.org/show_bug.cgi?id=1209366
https://bugzilla.mozilla.org/show_bug.cgi?id=1209368
https://bugzilla.mozilla.org/show_bug.cgi?id=1209546
https://bugzilla.mozilla.org/show_bug.cgi?id=1222015
https://bugzilla.mozilla.org/show_bug.cgi?id=1229825
https://bugzilla.mozilla.org/show_bug.cgi?id=1231121
https://bugzilla.mozilla.org/show_bug.cgi?id=1234576
https://security.gentoo.org/glsa/201605-06
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