CVE-2020-20949 - CVE House
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Status published Medium CVE-2020-20949

Bleichenbacher's attack on PKCS #1 v1.5 padding for RSA in...

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Affected Software

stm32cubef0, stm32cubef1, stm32cubef2, stm32cubef3, stm32cubef4, stm32cubef7, stm32cubeg0, stm32cubeg4, stm32cubeh7, stm32cubeide, stm32cubel0, stm32cubel1, stm32cubel4, stm32cubel4\+, stm32cubel5, stm32cubemonitor, stm32cubemp1, stm32cubemx, stm32cubeprogrammer, stm32cubewb, stm32cubewl, public key cryptography standards \#1
Vulnerable Versions:
1.5

Timeline

Official Publish: January 20th, 2021
Last Modified: July 9th, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.