CVE-2013-6792Public exploitNetwork attack vector

APK code substitution via inconsistent ZIP header lengths

Published Jan 23, 2020 · Updated Aug 6, 2024

Signature verification bypass in Google Android before 4.4 allows attackers to alter an APK without invalidating its original signature. ZipFile reads a file-name length from the central directory while other parsers use the local header, so conflicting lengths expose different bytes to verification and execution. A crafted APK must reach an affected device; substituted code retains the original package signature and associated trust.

CVSS severity9.8
Critical
EPSS probability2.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Signature verification bypass in Google Android before 4.4 allows attackers to alter an APK without invalidating its original signature. ZipFile reads a file-name length from the central directory while other parsers use the local header, so conflicting lengths expose different bytes to verification and execution. A crafted APK must reach an affected device; substituted code retains the original package signature and associated trust.

The record

CVE
CVE-2013-6792
Published
Jan 23, 2020
Updated
Aug 6, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1036
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1036Masquerading

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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