CVE-2023-21443

Message decryption and command injection via weak cryptography

Published Feb 9, 2023 · Updated Mar 24, 2025

Improper cryptography in Samsung Flow for Android before 4.9.04 allows adjacent attackers to decrypt messages or inject commands. Samsung identifies the cryptographic implementation as faulty but does not disclose the affected protocol, algorithm, key handling, or validation error. Access requires proximity to the communication path; the documented consequences are message disclosure and unauthorized command injection.

CVSS severity7.5
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper cryptography in Samsung Flow for Android before 4.9.04 allows adjacent attackers to decrypt messages or inject commands. Samsung identifies the cryptographic implementation as faulty but does not disclose the affected protocol, algorithm, key handling, or validation error. Access requires proximity to the communication path; the documented consequences are message disclosure and unauthorized command injection.

The record

CVE
CVE-2023-21443
Published
Feb 9, 2023
Updated
Mar 24, 2025
Vendor
Samsung Electronics
Product
Samsung Flow
Classifications
CWE-326, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 2025Record 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=unspecified <4.9.04

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Samsung Electronics · Samsung Flowversion=unspecified <4.9.04

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5Samsung MobileCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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

Weakness, pattern, technique

CWE-326Inadequate Encryption Strength
T1557Adversary-in-the-Middle

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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