CVE-2023-21220Network attack vector

Remote information disclosure via unencrypted cellular transport

Published Jun 28, 2023 · Updated Dec 3, 2024

Cleartext transmission in the Android kernel allows remote attackers to disclose sensitive information over cellular networks. An insecure default in the Exynos SLSI subcomponent permits affected cellular traffic to use unencrypted transport. No privileges or user interaction are required, but exploitation depends on cellular-network exposure and affects confidentiality only.

CVSS severity7.5
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext transmission in the Android kernel allows remote attackers to disclose sensitive information over cellular networks. An insecure default in the Exynos SLSI subcomponent permits affected cellular traffic to use unencrypted transport. No privileges or user interaction are required, but exploitation depends on cellular-network exposure and affects confidentiality only.

The record

CVE
CVE-2023-21220
Published
Jun 28, 2023
Updated
Dec 3, 2024
Vendor
Google Cloud
Product
Android
Classifications
CWE-319, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Android kernel

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Androidversion=Android kernel

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1040Network Sniffing

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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