# CVE-2013-4787 — Google Android 1.6

> As of 2026-11-05, CVE-2013-4787 is a vulnerability in Google Android 1.6, EPSS 13.5% (96.4th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2013-4787, most recently “GhostMap: Android ZIP-parsing flaw (libziparchive/libandroidfw mismatch) lets a malicious APK trigger a persistent system_server crash loop”.

**Last updated:** 2024-09-17

## What is 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 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.

The record classifies CVE-2013-4787 under weakness class [CWE-310](https://cwe.mitre.org/data/definitions/310.html). 30 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 4867 days ago.

## Severity and exploitation probability

- **CVSS v2.0 base score:** 9.3 (`AV:N/AC:M/Au:N/C:C/I:C/A:C`)
- **EPSS (FIRST):** 13.5% probability of exploitation in the next 30 days, higher than 96.4% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2013-07-09, last modified 2024-09-17

## Is CVE-2013-4787 being exploited?

Weaponised exploit code for CVE-2013-4787 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 37 in the Threadlinqs vulnerability feed.

- [trickest/cve](https://github.com/trickest/cve/blob/main/2013/CVE-2013-4787.md) (trickest)

## Affected products and versions

- [Google](https://intel.threadlinqs.com/vendors/google): Android 1.6, Android 2.0, Android 2.0.1, Android 2.1, Android 2.2, Android 2.2.1, Android 2.2.2, Android 2.2.3, Android 2.3, Android 2.3.1, Android 2.3.2, Android 2.3.3, Android 2.3.4, Android 2.3.5, Android 2.3.6, Android 2.3.7, Android 3.0, Android 3.1, Android 3.2, Android 3.2.1, Android 3.2.2, Android 3.2.4, Android 3.2.6, Android 4.0, Android 4.0.1

_Showing 25 of 30 recorded product entries._

## How to fix CVE-2013-4787

No vendor patch reference has been recorded for CVE-2013-4787 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2013-4787

1 tracked threat in the Threadlinqs corpus references CVE-2013-4787, either in the campaign’s CVE list or as an indicator on the campaign record.

- [GhostMap: Android ZIP-parsing flaw (libziparchive/libandroidfw mismatch) lets a malicious APK trigger a persistent system_server crash loop](https://intel.threadlinqs.com/threat/TL-2026-5312) — MEDIUM · 2026-11-05

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-11-05. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vulnerability database entry**

- [securityfocus.com — vdb entry](http://www.securityfocus.com/bid/60952)
- [osvdb.org — vdb entry](http://www.osvdb.org/94773)

**Other references**

- [jira.cyanogenmod.org](https://jira.cyanogenmod.org/browse/CYAN-1602)
- [plus.google.com](https://plus.google.com/113331808607528811927/posts/GxDA6111vYy)
- [zdnet.com](http://www.zdnet.com/google-releases-fix-to-oems-for-blue-security-android-security-hole-7000017782/)
- [bluebox.com](http://bluebox.com/corporate-blog/bluebox-uncovers-android-master-key/)
- [review.cyanogenmod.org](http://review.cyanogenmod.org/#/c/45251/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2013-4787
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