CVE-2021-43392

Name: CVE-2021-43392
Creator: NVD / NIST
Published: 2022-03-04T13:15:08.193+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.2/10EPSS 0.16%

Last modified Jun 17, 2026

CVE-2021-43392 is a medium-severity vulnerability rated 6.2/10 on the CVSS scale. STMicroelectronics STSAFE-J 1.1.4, J-SAFE3 1.2.5, and J-SIGN sometimes allow attackers to obtain information on cryptographic secrets. This is associated with the ECDSA signature algorithm on the Java Card J-SAFE3 and STSAFE-J platforms exposing a 3.0.4 Java Card API. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

Description

STMicroelectronics STSAFE-J 1.1.4, J-SAFE3 1.2.5, and J-SIGN sometimes allow attackers to obtain information on cryptographic secrets. This is associated with the ECDSA signature algorithm on the Java Card J-SAFE3 and STSAFE-J platforms exposing a 3.0.4 Java Card API. It is exploitable for STSAFE-J in closed configuration and J-SIGN (when signature verification is activated) but not for J-SAFE3 EPASS BAC and EAC products. It might also impact other products based on the J-SAFE-3 Java Card platform.

Metrics

CVSS 3.1

6.2/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.16%

5.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
St	J-Safe3 Firmware	1.2.5
St	Stsafe-J Firmware	1.1.4

References

https://community.st.com/s/toparticlesVendor Advisory
https://www.cert.ssi.gouv.fr/avis/CERTFR-2022-AVI-169/Third Party Advisory
https://community.st.com/s/toparticlesVendor Advisory
https://www.cert.ssi.gouv.fr/avis/CERTFR-2022-AVI-169/Third Party Advisory

Timeline

Published: Mar 4, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43392?

How severe is CVE-2021-43392?

CVE-2021-43392 has a CVSS score of 6.2/10 (MEDIUM severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43392?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43392?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST