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CVE-2013-4787

66
FAUCET Score

CVE-2013-4787, known as the "Master Key" vulnerability, affects Android versions 1.6 through 4.2. It allows attackers to execute arbitrary code by bypassing cryptographic signature checks for application package files (APKs). This critical vulnerability carries a CVSS score of 9.3, indicating a network-based attack with medium complexity that can lead to complete compromise of confidentiality, integrity, and availability. While not listed on CISA's KEV catalog, exploit code is publicly available on ExploitDB, though there is minimal community discussion or media coverage surrounding this older vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
1.6CPE matchmatch criteria
cpe:2.3:o:google:android:1.6:*:*:*:*:*:*:*
2.0CPE matchmatch criteria
cpe:2.3:o:google:android:2.0:*:*:*:*:*:*:*
2.0.1CPE matchmatch criteria
cpe:2.3:o:google:android:2.0.1:*:*:*:*:*:*:*
2.1CPE matchmatch criteria
cpe:2.3:o:google:android:2.1:*:*:*:*:*:*:*
2.2CPE matchmatch criteria
cpe:2.3:o:google:android:2.2:*:*:*:*:*:*:*

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
58.92%
Probability of exploitation in next 30 days
EPSS Percentile
99.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-38627 · Jul 3, 2013
This CVE's current EPSS score of 0.5892 is in the 98th 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

bluebox.com / corporate-blog/bluebox-uncovers-android-master-key
review.cyanogenmod.org
jira.cyanogenmod.org / browse/CYAN-1602
plus.google.com / 113331808607528811927/posts/GxDA6111vYy
osvdb.org / 94773
securityfocus.com / bid/60952
zdnet.com / google-releases-fix-to-oems-for-blue-security-android-security-hole-7000017782