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CVE-2016-9899

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 20.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-06-11 · updated 2026-06-17
• Weakness: CWE-416

Description

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.

Affected products

• Debian Linux: 9.0
• Mozilla Firefox: from 52.0 before 52.1.0; before 53.0; before 45.9.0 — fixed in 45.9.0, 52.1.0, 53.0
• Mozilla Thunderbird: before 52.1.0 — fixed in 52.1.0
• Red Hat Enterprise Linux: 5.0, 6.0, 7.0
• RedHat Enterprise Linux Desktop: 5.0, 6.0, 7.0
• RedHat Enterprise Linux Server: 5.0, 6.0, 7.0
• RedHat Enterprise Linux Server Aus: 7.3, 7.4
• RedHat Enterprise Linux Server Eus: 7.3, 7.4, 7.5
• RedHat Enterprise Linux Workstation: 5.0, 6.0, 7.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 45.9.0, 52.1.0, 53.0; Mozilla Thunderbird 52.1.0. Check the vendor advisory for mitigations.

References

• http://rhn.redhat.com/errata/RHSA-2016-2946.html
• http://rhn.redhat.com/errata/RHSA-2016-2973.html
• http://www.securityfocus.com/bid/94885
• http://www.securitytracker.com/id/1037461
• https://bugzilla.mozilla.org/show_bug.cgi?id=1317409
• https://security.gentoo.org/glsa/201701-15
• https://www.debian.org/security/2017/dsa-3757
• https://www.exploit-db.com/exploits/41042/
• https://www.mozilla.org/security/advisories/mfsa2016-94/
• https://www.mozilla.org/security/advisories/mfsa2016-95/
• https://www.mozilla.org/security/advisories/mfsa2016-96/
• http://rhn.redhat.com/errata/RHSA-2016-2946.html

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