CVE-2020-20950

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Summary

CVECVE-2020-20950
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-01-19 13:15:11 UTC
Updated2026-07-09 00:16:53 UTC
DescriptionBleichenbacher'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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

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

EPSS: 0.008590000 probability, percentile 0.542210000 (date 2026-07-11)

Problem Types: CWE-327 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
2.0[email protected]Primary4.3AV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None

AV:N/AC:M/Au:N/C:P/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Apple Macos - All All All
Application Ietf Public Key Cryptography Standards 1 1.5 All All All
Operating System Linux Linux Kernel - All All All
Application Microchip Microchip Libraries For Applications All All All All
Operating System Microsoft Windows - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Microchip Libraries for Applications | Microchip Technology Inc. af854a3a-2127-422b-91ae-364da2661108 www.microchip.com Product
Silence Will Fall (Or How It Can Take 2 Years to Get Your Vuln Registered) | by BI.ZONE | Jan, 2021 | Medium af854a3a-2127-422b-91ae-364da2661108 bi-zone.medium.com Technical Description, Third Party Advisory
archiv.infsec.ethz.ch/education/fs08/secsem/bleichenbacher98.pdf af854a3a-2127-422b-91ae-364da2661108 archiv.infsec.ethz.ch Technical Description, Third Party Advisory
microchip.com MITRE microchip.com
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