Is CVE-2016-9899 being actively exploited?

CVE-2016-9899 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2016-9899?

CVE-2016-9899 has a CVSS 3.0 base score of 9.8 (CRITICAL).

CVE-2016-9899

CRITICAL · CVSS 9.8EPSS 21.1%EU EUVD

Use-after-free while manipulating DOM events and removing audio elements due to errors in the handling of node adoption. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.

Key facts

CVSS score: 9.8 (v3.0)
Severity: CRITICAL
CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
EPSS score: 21.1% (98th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2016-10688)
Published: June 11, 2018
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2016-10688 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

debian / debian linux
mozilla / firefox
mozilla / thunderbird
redhat / enterprise linux
redhat / enterprise linux
redhat / enterprise linux
redhat / enterprise linux desktop
redhat / enterprise linux desktop
redhat / enterprise linux desktop
redhat / enterprise linux server
redhat / enterprise linux server
redhat / enterprise linux server
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server eus
redhat / enterprise linux server eus
redhat / enterprise linux server eus
redhat / enterprise linux workstation
redhat / enterprise linux workstation
redhat / enterprise linux workstation

Certified products that may be affected

7 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Red Hat Enterprise Linux libgcrypt Cryptographic Module v4.0 [1] and Red Hat Enterprise Linux libgcrypt Cryptographic Module v5.0 [2] - Red Hat®, Inc. - FIPS 140 2657 - historical
Red Hat Enterprise Linux 5 OpenSSH-Server Cryptographic Module - Red Hat®, Inc. - FIPS 140 1384 - historical
Red Hat Enterprise Linux 5 OpenSSH Client Cryptographic Module - Red Hat®, Inc. - FIPS 140 1385 - historical
Red Hat Enterprise Linux 5 OpenSwan Cryptographic Module - Red Hat®, Inc. - FIPS 140 1386 - historical
Red Hat Enterprise Linux 5 Kernel Crypto API Cryptographic Module - Red Hat®, Inc. - FIPS 140 1387 - historical

See all 7 in the Security Certifications Explorer.

References

http://rhn.redhat.com/errata/RHSA-2016-2946.html(Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2016-2973.html(Third Party Advisory)
http://www.securityfocus.com/bid/94885(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1037461(Third Party Advisory, VDB Entry)
https://bugzilla.mozilla.org/show_bug.cgi?id=1317409(Exploit, Issue Tracking, Vendor Advisory)
https://security.gentoo.org/glsa/201701-15(Third Party Advisory)
https://www.debian.org/security/2017/dsa-3757(Third Party Advisory)
https://www.exploit-db.com/exploits/41042/(Third Party Advisory, VDB Entry)
https://www.mozilla.org/security/advisories/mfsa2016-94/(Vendor Advisory)
https://www.mozilla.org/security/advisories/mfsa2016-95/(Vendor Advisory)
https://www.mozilla.org/security/advisories/mfsa2016-96/(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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