Medium severity5.9NVD Advisory· Published Jan 20, 2021· Updated Jul 9, 2026
CVE-2020-20949
CVE-2020-20949
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
24- cpe:2.3:a:ietf:public_key_cryptography_standards_\#1:1.5:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubef0:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubef1:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubef2:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubef3:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubef4:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubef7:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubeg0:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubeg4:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubeh7:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubeide:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubel0:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubel1:-:*:*:*:*:*:*:*
cpe:2.3:a:st:stm32cubel4:-:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:st:stm32cubel4:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubel4\+:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubel5:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubemonitor:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubemp1:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubemx:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubeprogrammer:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubewb:-:*:*:*:*:*:*:*
- cpe:2.3:a:st:stm32cubewl:-:*:*:*:*:*:*:*
- STM32/cryptographic firmware library software expansion for STM32Cubedescription
Patches
Vulnerability mechanics
References
3- archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdfnvdTechnical DescriptionThird Party Advisory
- bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bbnvdTechnical DescriptionThird Party Advisory
- www.st.com/en/embedded-software/x-cube-cryptolib.htmlnvdThird Party Advisory
News mentions
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