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CVE-2015-3863

23
FAUCET Score

CVE-2015-3863 describes multiple integer overflows within the Blob class of Android's Keystore, specifically in versions prior to 5.1.1 LMY48M. This critical vulnerability allows attackers to execute arbitrary code and read sensitive Keystore keys by crafting a malicious blob during an insert operation within an application. With a CVSS score of 9.3, it represents a high-severity threat, requiring medium attack complexity but offering complete confidentiality, integrity, and availability impacts. Despite its severity, there is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 5.1CPE matchmatch criteria
cpe:2.3:o:google:android:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

9.3HIGH

AV:N/AC:M/Au:N/C:C/I:C/A:C

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.28%
Probability of exploitation in next 30 days
EPSS Percentile
67.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0128 is in the 27th percentile among its peer group of 8,920 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

android.googlesource.com / platform/system/security/+/bb9f4392c2f1b11be3acdc1737828274ff1ec55b
Vendor Advisory
groups.google.com / forum/message/raw
Vendor Advisory