CVE-2021-0428

Local ICCID disclosure via missing permission checks

Published Apr 13, 2021 · Updated Aug 3, 2024

Information disclosure in Android 10 telephony allows local users to read a trackable SIM identifier without user interaction. The framework protects TelephonyManager.getSimSerialNumber but leaves the same ICCID exposed through SubscriptionInfo.getIccId and SubscriptionInfo.toString. Code execution with ordinary user privileges is required, and the disclosed ICCID enables persistent tracking without data modification or service interruption.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Android 10 telephony allows local users to read a trackable SIM identifier without user interaction. The framework protects TelephonyManager.getSimSerialNumber but leaves the same ICCID exposed through SubscriptionInfo.getIccId and SubscriptionInfo.toString. Code execution with ordinary user privileges is required, and the disclosed ICCID enables persistent tracking without data modification or service interruption.

The record

CVE
CVE-2021-0428
Published
Apr 13, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-862, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

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  1. Affected versionversion=Android-10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Google Cloud · Androidversion=Android-10

Published CVSS scores

2.1NIST National Vulnerability DatabaseAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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