Is CVE-2023-21420 being actively exploited?

CVE-2023-21420 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2023-21420?

CVE-2023-21420 has a CVSS 3.1 base score of 7.3 (HIGH).

CVE-2023-21420

HIGH · CVSS 7.3EPSS 0.2%EU EUVD

Use of Externally-Controlled Format String vulnerabilities in STST TA prior to SMR Jan-2023 Release 1 allows arbitrary code execution.

Key facts

CVSS score: 7.3 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Weakness (CWE): CWE-134
EPSS score: 0.2% (10th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2023-25588)
Published: February 9, 2023
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2023-25588 in the EU Vulnerability Database. Last updated in EUVD on March 24, 2025.

View on the EU Vulnerability Database

Affected products

samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android
samsung / android

and 37 more…

Certified products that may be affected

4 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Samsung Galaxy Devices on Android 11 - Fall - Samsung Electronics Co., Ltd. - Common Criteria CCEVS-VR-VID-11211-2021 - archived
Samsung Galaxy Devices on Android 11 - Spring - Samsung Electronics Co., Ltd. - Common Criteria CCEVS-VR-VID-11160-2021 - archived
Samsung Galaxy Devices on Android 10 - Fall - Samsung Electronics Co., Ltd. - Common Criteria CCEVS-VR-VID-11109-2020 - archived
Samsung Galaxy Devices on Android 10 - Spring - Samsung Electronics Co., Ltd. - Common Criteria CCEVS-VR-VID-11042-2020 - archived

References

https://security.samsungmobile.com/securityUpdate.smsb?year=2023&month=01(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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