CVE-2013-4787
Android 1.6 Donut through 4.2 Jelly Bean does not properly check cryptographic signatures for applications, which allows attackers to execute arbitrary code via an application package file (APK) that is modified in a way that does not violate the…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 13.5%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
Description
Android 1.6 Donut through 4.2 Jelly Bean does not properly check cryptographic signatures for applications, which allows attackers to execute arbitrary code via an application package file (APK) that is modified in a way that does not violate the cryptographic signature, probably involving multiple entries in a Zip file with the same name in which one entry is validated but the other entry is installed, aka Android security bug 8219321 and the "Master Key" vulnerability.
- CVSS 2.0
- 9.3 HIGHAV:N/AC:M/Au:N/C:C/I:C/A:C
- EPSS
- 13.53% probability · 96th percentile
- Public exploits
- 1 in Exploit-DB · verified · first 3 July 2013
- CISA KEV
- Not listed
- Weakness
- CWE-310
- Affected
- google/android
- Source
- cve@mitre.org
EPSS moved from 13.4% on 24 September 2026 to 13.5% on 4 November 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://bluebox.com/corporate-blog/bluebox-uncovers-android-master-key/
- http://review.cyanogenmod.org/#/c/45251/
- http://www.osvdb.org/94773
- http://www.securityfocus.com/bid/60952
- http://www.zdnet.com/google-releases-fix-to-oems-for-blue-security-android-security-hole-7000017782/
- https://jira.cyanogenmod.org/browse/CYAN-1602
- https://plus.google.com/113331808607528811927/posts/GxDA6111vYy
- http://bluebox.com/corporate-blog/bluebox-uncovers-android-master-key/
- http://review.cyanogenmod.org/#/c/45251/
- http://www.osvdb.org/94773
- http://www.securityfocus.com/bid/60952
- http://www.zdnet.com/google-releases-fix-to-oems-for-blue-security-android-security-hole-7000017782/
- https://jira.cyanogenmod.org/browse/CYAN-1602
- https://plus.google.com/113331808607528811927/posts/GxDA6111vYy
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.