CVE-2016-9899

CRITICALNVD 9.89.8—Elevated

9.8

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.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 97.3%
KEV: Not listed

Published

June 11, 2018

Last Modified

November 25, 2025

References (22)

security@mozillahttp://rhn.redhat.com/errata/RHSA-2016-2946.html
security@mozillahttp://rhn.redhat.com/errata/RHSA-2016-2973.html
security@mozillahttp://www.securityfocus.com/bid/94885
security@mozillahttp://www.securitytracker.com/id/1037461
security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=1317409
security@mozillahttps://security.gentoo.org/glsa/201701-15
security@mozillahttps://www.debian.org/security/2017/dsa-3757
security@mozillahttps://www.exploit-db.com/exploits/41042/
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2016-94/
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2016-95/
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2016-96/
af854a3a-2127-422b-91ae-364da2661108http://rhn.redhat.com/errata/RHSA-2016-2946.html
af854a3a-2127-422b-91ae-364da2661108http://rhn.redhat.com/errata/RHSA-2016-2973.html
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/94885
af854a3a-2127-422b-91ae-364da2661108http://www.securitytracker.com/id/1037461

Patch Availability(4)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	firefox (50.1.0+build2-0ubuntu0.16.10.1) @ yakkety	2026-05-28	ubuntu
ubuntu	thunderbird (1:45.7.0+build1-0ubuntu0.16.10.1) @ yakkety	2026-05-28	ubuntu
redhat	thunderbird-0:45.6.0-1.el7_3	2016-12-21	redhat
redhat	firefox-0:45.6.0-1.el7_3	2016-12-14	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-416Use After Free

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-16 17:50 UTCEPSS rescore
2026-06-15 18:13 UTCOSV refresh
2026-06-15 17:45 UTCEPSS rescore
2026-06-14 23:14 UTCEPSS rescore
2026-06-14 23:14 UTCEPSS rescore
2026-06-13 22:57 UTCEPSS rescore
2026-06-13 22:57 UTCEPSS rescore
2026-06-12 23:09 UTCEPSS rescore
2026-06-11 13:57 UTCEPSS rescore
2026-06-08 14:14 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-07 15:22 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:44 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:10 UTCEPSS rescore
2026-05-31 22:28 UTCEPSS rescore
2026-05-31 22:28 UTCEPSS rescore
2026-05-31 00:14 UTCEPSS rescore
2026-05-29 13:41 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore

Show 8 more

2026-05-28 13:42 UTCEPSS rescore
2026-05-28 06:59 UTCEG score recompute
2026-05-28 06:59 UTCVendor advisory
2026-05-28 06:59 UTCGHSA enrichment
2026-05-27 13:38 UTCEPSS rescore
2026-05-27 13:38 UTCEPSS rescore
2026-05-26 07:17 UTCEPSS rescore
2026-05-24 08:21 UTCOSV refresh

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-41042
First seen Jan 13, 2017
Mozilla Firefox < 50.1.0 - Use-After-Free
Open source ↗

Frequently asked(5)

What is CVE-2016-9899?

CVE-2016-9899 is a critical vulnerability published on June 11, 2018. 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.

When was CVE-2016-9899 disclosed?

CVE-2016-9899 was first published in the National Vulnerability Database on June 11, 2018, with the most recent update on November 25, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2016-9899 actively exploited?

CVE-2016-9899 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 97.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

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

CVE-2016-9899 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2016-9899?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-9899, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2016-9899

Published

Last Modified

References (22)

Patch Availability(4)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2016-9899?

Same vendor

Same CWE

CVE-2016-9899

📅 Published

🔄 Last Modified

🔗 References (22)

Patch Availability(4)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2016-9899?

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References (22)

Frequently asked(5)

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