CVE-2017-18689Network attack vector

Kernel module signature bypass via count tampering

Published Apr 7, 2020 · Updated Aug 5, 2024

Signature bypass in Samsung mobile software on Android 6.0 and 7.0 allows remote attackers to evade kernel module verification via a modified count. The kernel module verifier uses a changeable module-count value when deciding whether a ko file has a valid signature, so count tampering defeats the integrity check. Exploitation applies only to affected Exynos5433, Exynos7420, or Exynos7870 devices and permits an unauthorized kernel module to pass verification; public records do not disclose the delivery path.

CVSS severity7.5
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Signature bypass in Samsung mobile software on Android 6.0 and 7.0 allows remote attackers to evade kernel module verification via a modified count. The kernel module verifier uses a changeable module-count value when deciding whether a ko file has a valid signature, so count tampering defeats the integrity check. Exploitation applies only to affected Exynos5433, Exynos7420, or Exynos7870 devices and permits an unauthorized kernel module to pass verification; public records do not disclose the delivery path.

The record

CVE
CVE-2017-18689
Published
Apr 7, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-354, T1547.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-354Improper Validation of Integrity Check Value
T1547.006Kernel Modules and Extensions

Public exploit references

No public exploit references are available in this record.

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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