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CVE-2020-36475

Date: August 22, 2021

An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS). The calculations performed by mbedtls_mpi_exp_mod are not limited; thus, supplying overly large parameters could lead to denial of service when generating Diffie-Hellman key pairs.

Language: C

Severity Score

Related Resources (9)

https://lists.debian.org/debian-lts-announce/2021/11/msg00021.html
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0
https://cert-portal.siemens.com/productcert/pdf/ssa-756638.pdf
https://nvd.nist.gov/vuln/detail/CVE-2020-36475
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9
https://security-tracker.debian.org/tracker/CVE-2020-36475
https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18
https://www.mend.io/vulnerability-database/CVE-2020-36475

Severity Score

Weakness Type (CWE)

Incorrect Calculation of Buffer Size

CWE-131

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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