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CVE-2016-3840

27
FAUCET Score

CVE-2016-3840 is a critical vulnerability in Conscrypt, affecting Android versions 4.x through 6.x prior to their respective August 2016 security updates. This flaw, stemming from improper session reuse identification, allows remote attackers to execute arbitrary code. With a CVSS v3 score of 9.8 (Critical), it presents a high-impact threat (confidentiality, integrity, availability) with low attack complexity and no user interaction required. Despite its severity, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
4.0CPE matchmatch criteria
cpe:2.3:o:google:android:4.0:*:*:*:*:*:*:*
4.0.1CPE matchmatch criteria
cpe:2.3:o:google:android:4.0.1:*:*:*:*:*:*:*
4.0.2CPE matchmatch criteria
cpe:2.3:o:google:android:4.0.2:*:*:*:*:*:*:*
4.0.3CPE matchmatch criteria
cpe:2.3:o:google:android:4.0.3:*:*:*:*:*:*:*
4.0.4CPE matchmatch criteria
cpe:2.3:o:google:android:4.0.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.14%
Probability of exploitation in next 30 days
EPSS Percentile
80.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0214 is in the 69th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

googlevendor investigatingvia nvd_reference
View patch

References

android.googlesource.com / platform/external/conscrypt/+/5af5e93463f4333187e7e35f3bd2b846654aa214
Issue TrackingPatch
source.android.com / security/bulletin/2016-08-01.html
Vendor Advisory
securityfocus.com / bid/92229