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CVE-2020-20949 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdf CVETechnical DescriptionThird Party Advisory
https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bb CVETechnical DescriptionThird Party Advisory
https://www.st.com/en/embedded-software/x-cube-cryptolib.html CVEThird Party Advisory
http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdf [email protected]Technical DescriptionThird Party Advisory
https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bb [email protected]Technical DescriptionThird Party Advisory

see all 6 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-327Use of a Broken or Risky Cryptographic Algorithm[email protected]

Affected Products

ProductVersions

Change History

8 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2020-20949
NVD Published Date:
Jan 20, 2021
NVD Last Modified:
Jul 9, 2026
Source:
[email protected]