CVE-2020-20950

Name: CVE-2020-20950
Creator: NVD / NIST
Published: 2021-01-19T13:15:11.887+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 0.86%

Last modified Jun 17, 2026

CVE-2020-20950 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. Bleichenbacher's attack on PKCS #1 v1.5 padding for RSA in Microchip Libraries for Applications 2018-11-26 All up to 2018-11-26. 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.. EPSS estimates a 0.86% chance of exploitation in the next 30 days.

Description

Bleichenbacher's attack on PKCS #1 v1.5 padding for RSA in Microchip Libraries for Applications 2018-11-26 All up to 2018-11-26. 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 3.1

5.9/10

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

EPSS Probability

0.86%

53.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-327

Affected Software

Vendor	Product	Versions
Ietf	Public Key Cryptography Standards \#1	1.5
Microchip	Microchip Libraries For Applications	<= 2018-11-26

References

http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdfTechnical Description, Third Party Advisory
http://microchip.comProduct
https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bbTechnical Description, Third Party Advisory
https://www.microchip.com/mplab/microchip-libraries-for-applicationsProduct
http://archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdfTechnical Description, Third Party Advisory
http://microchip.comProduct
https://bi-zone.medium.com/silence-will-fall-or-how-it-can-take-2-years-to-get-your-vuln-registered-e6134846f5bbTechnical Description, Third Party Advisory
https://www.microchip.com/mplab/microchip-libraries-for-applicationsProduct

Timeline

Published: Jan 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-20950?

How severe is CVE-2020-20950?

CVE-2020-20950 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.86% probability of exploitation in the next 30 days.

How do I fix CVE-2020-20950?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-20950?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST