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Fencer Vulns
critical 9.8

CVE-2016-4121 in the critical feed json

Use-after-free vulnerability in Adobe Flash Player before 18.0.0.352 and 19.x through 21.x before 21.0.0.242 on Windows and OS X and before…

published 2016-06-16 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-5122

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
10.0%
EPSS 10.0% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

Use-after-free vulnerability in Adobe Flash Player before 18.0.0.352 and 19.x through 21.x before 21.0.0.242 on Windows and OS X and before 11.2.202.621 on Linux allows attackers to execute arbitrary code via unspecified vectors, a different vulnerability than CVE-2016-1097, CVE-2016-1106, CVE-2016-1107, CVE-2016-1108, CVE-2016-1109, CVE-2016-1110, CVE-2016-4108, and CVE-2016-4110.

Patch / fix

  • flashplugin-nonfree Ubuntu 14.04 LTS 11.2.202.626ubuntu0.14.04.1
  • flashplugin-nonfree Ubuntu 16.04 LTS 11.2.202.626ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2016-4121

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • flash-plugin RHEL 5 EXTRAS 11.2.202.621-1.el5
  • flash-plugin RHEL 6 EXTRAS 11.2.202.621-1.el6_8

red hat advisories RHSA-2016:1079

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-4121 updated cvss 6.8

flash-plugin: multiple code execution issues fixed in APSB16-15

  • Red Hat Enterprise Linux Desktop Supplementary (v. 5) flash-plugin 11.2.202.621-1.el5 Red Hat Enterprise Linux Desktop Supplementary (v. 6) flash-plugin 11.2.202.621-1.el6_8 Red Hat Enterprise Linux Server Supplementary (v. 5) flash-plugin 11.2.202.621-1.el5 Red Hat Enterprise Linux Server Supplementary (v. 6) flash-plugin 11.2.202.621-1.el6_8 Red Hat Enterprise Linux Workstation Supplementary (v. 6) flash-plugin 11.2.202.621-1.el6_8
    fixed: vendor fix RHSA-2016:1079

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

10.00% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.