No exploitation reportedFix available

CVE-2016-4121

No exploitation reported by the sources we read.

Published2016-06-16
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 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.

Timeline

dates in UTC

2016-06-1614:59CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 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-2016-4121?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-4121?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Adobe flash playerversion to verify

Branch	Affected	Fixed in	Source
21.0	≤ 21.0.0.241	no fix published	NVD
18.0	≤ 18.0.0.343	no fix published	NVD
11.2	≤ 11.2.202.616	no fix published	NVD
21.0	≤ 21.0.0.216	no fix published	NVD

Adobe air desktop runtimeversion to verify

Branch	Affected	Fixed in	Source
21.0	≤ 21.0.0.198	no fix published	NVD

Adobe air sdkversion to verify

Branch	Affected	Fixed in	Source
21.0	≤ 21.0.0.198	no fix published	NVD

2 more products in the sources.

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

Fix

Advisories and patches

helpx.adobe.comPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
NVDweakness (CWE)CWE-416read 2026-10-23
FIRST EPSSEPSS score10.0 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2016-06-16
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2016-4121?

Is CVE-2016-4121 actively exploited?

Active exploitation of CVE-2016-4121 has not been confirmed. Its EPSS score was 10.0% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-4121?

CVE-2016-4121 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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