What is CVE-2020-20949?

CVE-2020-20949 is a medium-severity vulnerability in Ietf Public Key Cryptography Standards \#1, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 5.9/10. Published 2021-01-20.

How severe is CVE-2020-20949?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Ietf Public Key Cryptography Standards \#1

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.

Vulnerability class: POODLE (CVE-2014-3566)

EPSS: 0.009 (56.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

CWE-327 — Use of a Broken or Risky Cryptographic Algorithm

References

cve@mitre.org (Technical Description, Third Party Advisory, x_refsource_MISC)
af854a3a-2127-422b-91ae-364da2661108 (Product, x_refsource_MISC)
af854a3a-2127-422b-91ae-364da2661108 (x_refsource_MISC, Broken Link)
cve@mitre.org (Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Technical Description, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2020-20949?: CVE-2020-20949 is a medium-severity vulnerability in Ietf Public Key Cryptography Standards \#1, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 5.9/10. Published 2021-01-20.
How severe is CVE-2020-20949?: Medium severity. CVSS v3 base score is 5.9 out of 10.