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Public proof of conceptFix available

CVE-2016-9899

A public proof of concept exists; no exploitation attested.

  • Published2018-06-11
  • Fixed in53.0 · 52.1.0 · 45.9.0
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2017-01-13Exploit-DB entryExploit-DB

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-9899?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-9899?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Mozilla firefox
BranchAffectedFixed in
53.0< 53.053.0
52.x≥ 52.0, < 52.1.052.1.0
45.9< 45.9.045.9.0
Redhat enterprise linux
BranchAffectedFixed in
5.0= 5.0no fix published
6.0= 6.0no fix published
7.0= 7.0no fix published
Redhat enterprise linux desktop
BranchAffectedFixed in
5.0= 5.0no fix published
6.0= 6.0no fix published
7.0= 7.0no fix published

6 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • firefoxUbuntu:16.04:LTSall versions · fixed in 50.1.0+build2-0ubuntu0.16.04.1
  • firefoxUbuntu:14.04:LTSall versions · fixed in 50.1.0+build2-0ubuntu0.14.04.1
  • firefoxRed Hat:enterprise_linux:7::workstationall versions · fixed in 0:45.6.0-1.el7_3and 3 other packages
  • firefoxRed Hat:enterprise_linux:7::serverall versions · fixed in 0:45.6.0-1.el7_3and 3 other packages
  • firefoxRed Hat:enterprise_linux:7::clientall versions · fixed in 0:45.6.0-1.el7_3and 3 other packages
  • firefoxRed Hat:enterprise_linux:6::workstationall versions · fixed in 0:45.6.0-1.el6_8and 3 other packages
  • firefoxRed Hat:enterprise_linux:6::serverall versions · fixed in 0:45.6.0-1.el6_8and 3 other packages
  • firefoxRed Hat:enterprise_linux:6::computenodeall versions · fixed in 0:45.6.0-1.el6_8and 1 other package

42 more package ranges on OSV.dev

Vendor advisories

  • CVE-2016-9899 Red Hat Product Security273 products fixed

    Mozilla: Use-after-free while manipulating DOM events and audio elements (MFSA 2016-94, MFSA 2016-95)

  • RHSA-2016:2973 Red Hat Product Security42 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2016:2946 Red Hat Product Security77 products fixed

    Red Hat Security Advisory: firefox security update

Full record on NVD

Fix

  1. Update Mozilla firefox to 53.0 · 52.1.0 · 45.9.0
  2. Vendor fix Red Hat Product Security RHSA-2016:2973 · 42 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
  3. Vendor fix Red Hat Product Security RHSA-2016:2946 · 77 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect.

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-41042
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.09.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • NVDweakness (CWE)CWE-416read 2026-10-23
  • FIRST EPSSEPSS score20.8 %read 2026-11-03
  • Exploit-DBdetectionread 2026-11-03
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2018-06-11
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2016-9899?

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.

Is CVE-2016-9899 actively exploited?

Active exploitation of CVE-2016-9899 has not been confirmed. Its EPSS score was 20.8% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

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

CVE-2016-9899 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record