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CVE-2016-4271

24
FAUCET Score

CVE-2016-4271 is a local-with-filesystem Flash sandbox bypass vulnerability in Adobe Flash Player versions before 18.0.0.375 and 23.0.0.162 on Windows/OS X, and before 11.2.202.635 on Linux, allowing attackers to bypass access restrictions and obtain sensitive information. With a CVSS score of 6.5 (Medium), this vulnerability requires user interaction and could lead to high confidentiality impact. While there is no known public exploit code or Metasploit module, the vulnerability has garnered some community discussion and media coverage, including reports of its potential to leak Windows credentials. It is not listed in CISA's KEV catalog and is considered inactive.

Impacted Technologies

VendorProductVersion(s)CPE
<= 11.2.202.632CPE matchmatch criteria
cpe:2.3:a:adobe:flash_player:*:*:*:*:*:*:*:*
<= 22.0.0.211CPE matchmatch criteria
cpe:2.3:a:adobe:flash_player:*:*:*:*:*:edge:*:*
<= 22.0.0.211CPE matchmatch criteria
cpe:2.3:a:adobe:flash_player:*:*:*:*:*:internet_explorer:*:*
<= 22.0.0.211CPE matchmatch criteria
cpe:2.3:a:adobe:flash_player_desktop_runtime:*:*:*:*:*:*:*:*
<= 18.0.0.366CPE matchmatch criteria
cpe:2.3:a:adobe:flash_player:*:*:*:*:esr:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.55%
Probability of exploitation in next 30 days
EPSS Percentile
90.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0456 is in the 96th percentile among its peer group of 26,208 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

adobepatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5 SupplementaryFixed in: flash-plugin-0:11.2.202.635-1.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6 SupplementaryFixed in: flash-plugin-0:11.2.202.635-1.el6_8
View patch

Vendor Advisories (1)

redhatCVE-2016-4271Critical

flash-plugin: multiple code execution issues fixed in APSB16-29

Sep 13, 2016

References

lab.truel.it / flash-sandbox-bypass
Broken LinkTechnical DescriptionThird Party Advisory
rhn.redhat.com / errata/RHSA-2016-1865.html
Third Party Advisory
blog.bjornweb.nl / 2017/02/flash-bypassing-local-sandbox-data-exfiltration-credentials-leak
ExploitThird Party Advisory
helpx.adobe.com / security/products/flash-player/apsb16-29.html
PatchVendor Advisory
security.gentoo.org / glsa/201610-10
Third Party Advisory
securitytracker.com / id/1036791
Broken LinkThird Party AdvisoryVDB Entry