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CVE-2018-21065

30
FAUCET Score

CVE-2018-21065 is a critical integer underflow vulnerability affecting Samsung mobile devices running Android versions M(6.0), N(7.x), and O(8.x) due to a missing size check in eCryptFS. This vulnerability carries a CVSS score of 9.8, indicating a critical risk with a network-based attack vector, low attack complexity, and high potential impact on confidentiality, integrity, and availability. There is no evidence of active exploitation, nor are there publicly available exploit modules in Metasploit, Nuclei, or ExploitDB. Despite the lack of exploit code, the vulnerability has garnered significant community discussion with 10 mentions, placing it in the top 1% of all CVEs for community attention.

Impacted Technologies

VendorProductVersion(s)CPE
6.0CPE matchmatch criteria
cpe:2.3:o:google:android:6.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:google:android:7.0:*:*:*:*:*:*:*
7.1.0CPE matchmatch criteria
cpe:2.3:o:google:android:7.1.0:*:*:*:*:*:*:*
7.1.1CPE matchmatch criteria
cpe:2.3:o:google:android:7.1.1:*:*:*:*:*:*:*
7.1.2CPE matchmatch criteria
cpe:2.3:o:google:android:7.1.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/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
3.1

Exploit Intelligence

EPSS Score
0.44%
Probability of exploitation in next 30 days
EPSS Percentile
36.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0044 is in the 14th percentile among its peer group of 36,862 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

Remediation records are not available for this CVE.

References

security.samsungmobile.com / securityUpdate.smsb
Vendor Advisory