CVE-2020-20949

Bleichenbacher's attack on PKCS #1 v1.5 padding for RSA in STM32 cryptographic firmware library software expansion for STM32Cube (UM1924). The vulnerability can allow one to use Bleichenbacher's oracle attack to decrypt an encrypted ciphertext by making successive queries to the server using the vulnerable library, resulting in remote information disclosure.

• CWE-327

• http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdfTechnical Description, Third Party Advisory
• https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bbTechnical Description, Third Party Advisory
• https://www.st.com/en/embedded-software/x-cube-cryptolib.htmlThird Party Advisory
• http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdfTechnical Description, Third Party Advisory
• https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bbTechnical Description, Third Party Advisory
• https://www.st.com/en/embedded-software/x-cube-cryptolib.htmlThird Party Advisory

Published

Jan 20, 2021

Last Modified

Jul 9, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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