What is CVE-2023-21443?

CVE-2023-21443 is a high-severity vulnerability in Samsung Flow, classified under Inadequate Encryption Strength. CVSS score: 7.5/10. Published 2023-02-09.

How severe is CVE-2023-21443?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Samsung Flow

CVE-2023-21443

Improper cryptographic implementation in Samsung Flow for Android prior to version 4.9.04 allows adjacent attackers to decrypt encrypted messages or inject commands.

Published 2023-02-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (7.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Samsung Flow
Samsung Mobile Flow For Android — versions unspecified

Weakness classification (CWE)

CWE-326 — Inadequate Encryption Strength

References

security.samsungmobile.com/serviceWeb.smsb (Vendor Advisory)

Frequently asked questions

What is CVE-2023-21443?: CVE-2023-21443 is a high-severity vulnerability in Samsung Flow, classified under Inadequate Encryption Strength. CVSS score: 7.5/10. Published 2023-02-09.
How severe is CVE-2023-21443?: High severity. CVSS v3 base score is 7.5 out of 10.