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CVE-2020-20949

Published: Jan 20, 2021Updated: Nov 21, 2024 Sources: CVE List NVDCWE-327
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.9%
Top 44.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-327

Affected Products

n/an/a
stm32cubef0st
Embedded
Operating Systems / rtos-embedded-os
stm32cubef1st
Embedded
Operating Systems / rtos-embedded-os
stm32cubef2st
Embedded
Operating Systems / rtos-embedded-os
stm32cubef3st
Embedded
Operating Systems / rtos-embedded-os
stcommercialCHOperating Systemsaka stm, stmicroelectronics, stmicroelectronics
and 18 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdf
archiv.infsec.ethz.ch
http://st.com
st.com
http://x-cube-cryptolib.com
x-cube-cryptolib.com
and 2 more references View all →

Timeline

Published
Jan 20, 2021
Last Updated
Nov 21, 2024

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