CVE-2016-9899

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 21%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

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

Advisory Details (9)

Auto-updated Jun 21, 2026
No patch confirmed yet.
generic

Security vulnerabilities fixed in Firefox ESR 45.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2016-95/
generic

Security vulnerabilities fixed in Firefox 50.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2016-94/
generic

[SECURITY] [DSA 3757-1] icedove security update

https://www.debian.org/security/2017/dsa-3757
generic

Mozilla Firefox, Thunderbird: Multiple vulnerabilities (GLSA 201701-15) — Gentoo security

https://security.gentoo.org/glsa/201701-15
generic

1317409 - (CVE-2016-9899) UAF involving mutation events, contenteditable iframes and adding and immediately removing audio elements

https://bugzilla.mozilla.org/show_bug.cgi?id=1317409
generic
http://www.securitytracker.com/id/1037461
generic
http://www.securityfocus.com/bid/94885
generic
http://rhn.redhat.com/errata/RHSA-2016-2973.html
generic
http://rhn.redhat.com/errata/RHSA-2016-2946.html

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox (50.1.0+build2-0ubuntu0.16.10.1) @ yakkety2026-05-28ubuntu
ubuntuthunderbird (1:45.7.0+build1-0ubuntu0.16.10.1) @ yakkety2026-05-28ubuntu
redhatthunderbird-0:45.6.0-1.el7_32016-12-21redhat
redhatfirefox-0:45.6.0-1.el7_32016-12-14redhat

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.

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 8× in last 7d / 34× 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.

  1. 2026-07-11 08:24 UTCEPSS rescore
  2. 2026-07-09 19:06 UTCEPSS rescore
  3. 2026-07-08 15:10 UTCEPSS rescore
  4. 2026-07-07 13:42 UTCEPSS rescore
  5. 2026-07-06 16:24 UTCEPSS rescore
  6. 2026-07-06 16:24 UTCEPSS rescore
  7. 2026-07-06 02:20 UTCEPSS rescore
  8. 2026-07-06 02:20 UTCEPSS rescore
  9. 2026-07-05 02:27 UTCEPSS rescore
  10. 2026-07-04 06:56 UTCOSV refresh
  11. 2026-07-04 06:28 UTCEPSS rescore
  12. 2026-07-01 15:02 UTCEPSS rescore
  13. 2026-06-29 14:03 UTCEPSS rescore
  14. 2026-06-28 14:04 UTCEPSS rescore
  15. 2026-06-28 04:53 UTCEPSS rescore
  16. 2026-06-27 03:05 UTCEPSS rescore
  17. 2026-06-25 13:47 UTCEPSS rescore
  18. 2026-06-24 14:02 UTCEPSS rescore
  19. 2026-06-23 21:30 UTCEPSS rescore
  20. 2026-06-22 14:23 UTCEPSS rescore
  21. 2026-06-21 01:57 UTCEPSS rescore
  22. 2026-06-21 01:57 UTCEPSS rescore
  23. 2026-06-18 17:50 UTCEPSS rescore
  24. 2026-06-18 17:50 UTCEPSS rescore
  25. 2026-06-17 17:50 UTCEPSS rescore
Show 34 more
  1. 2026-06-17 17:50 UTCEPSS rescore
  2. 2026-06-16 17:50 UTCEPSS rescore
  3. 2026-06-15 18:13 UTCOSV refresh
  4. 2026-06-15 17:45 UTCEPSS rescore
  5. 2026-06-14 23:14 UTCEPSS rescore
  6. 2026-06-14 23:14 UTCEPSS rescore
  7. 2026-06-13 22:57 UTCEPSS rescore
  8. 2026-06-13 22:57 UTCEPSS rescore
  9. 2026-06-12 23:09 UTCEPSS rescore
  10. 2026-06-11 13:57 UTCEPSS rescore
  11. 2026-06-08 14:14 UTCEPSS rescore
  12. 2026-06-07 15:22 UTCEPSS rescore
  13. 2026-06-07 15:22 UTCEPSS rescore
  14. 2026-06-06 13:45 UTCEPSS rescore
  15. 2026-06-06 13:45 UTCEPSS rescore
  16. 2026-06-05 22:44 UTCEPSS rescore
  17. 2026-06-05 06:08 UTCEPSS rescore
  18. 2026-06-05 06:08 UTCEPSS rescore
  19. 2026-06-04 13:10 UTCEPSS rescore
  20. 2026-06-04 13:10 UTCEPSS rescore
  21. 2026-06-02 20:10 UTCEPSS rescore
  22. 2026-05-31 22:28 UTCEPSS rescore
  23. 2026-05-31 22:28 UTCEPSS rescore
  24. 2026-05-31 00:14 UTCEPSS rescore
  25. 2026-05-29 13:41 UTCEPSS rescore
  26. 2026-05-28 13:42 UTCEPSS rescore
  27. 2026-05-28 13:42 UTCEPSS rescore
  28. 2026-05-28 06:59 UTCEG score recompute
  29. 2026-05-28 06:59 UTCVendor advisory
  30. 2026-05-28 06:59 UTCGHSA enrichment
  31. 2026-05-27 13:38 UTCEPSS rescore
  32. 2026-05-27 13:38 UTCEPSS rescore
  33. 2026-05-26 07:17 UTCEPSS rescore
  34. 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 ↗

Related CVEs(same vendor + same CWE)

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.

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