CVE-2023-21472 — Improper input validation with Exynos Fastboot USB Interface prior to SMR Apr-20

Improper input validation with Exynos Fastboot USB Interface prior to SMR Apr-2023 Release 1 allows a physical attacker to execute arbitrary code in bootloader.

01What is this vulnerability?

Improper input validation with Exynos Fastboot USB Interface prior to SMR Apr-2023 Release 1 allows a physical attacker to execute arbitrary code in bootloader.

02Affected products

Vendor	Product	Versions
Samsung Mobile	Samsung Mobile Devices	SMR Apr-2023 Release in Selected Android 11, 12, 13 Exynos devices

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-09-03T05:17:04.888Z
• Last modified: 2025-09-03T15:43:53.037Z

09References

• security.samsungmobile.com — https://security.samsungmobile.com/securityUpdate.smsb?year=2023&month=04