Home/CVE/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 perfor
CVE

CVE-2020-36475

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 perfor

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.

HIGH · CVSS 7.5 EPSS 0.00979
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-131Incorrect Calculation of Buffer Size
▤

Affected Products & Versions

10
arm mbed tls< 2.7.18
arm mbed tls>= 2.8.0 and < 2.16.9
arm mbed tls>= 2.17.0 and < 2.25.0
siemens logo\! cmr2020 firmware< 2.2
siemens logo\! cmr2040 firmware< 2.2
siemens simatic rtu3031c firmwareall versions
siemens simatic rtu3041c firmwareall versions
siemens simatic rtu3030c firmwareall versions
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD23 Aug 2021 · 02:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

3
msrcCVE-2020-36475
siemens-csafSSA-756638
cisa-csafcisa-csaf-csaf_files-OT-white-2021-icsa-21-257-20
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cert-portal.siemens.com/productcert/pdf/ssa-756638.pdfPatchThird Party Advisory
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9Release NotesThird Party Advisory
https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0Release NotesThird Party Advisory
https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18Release NotesThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/11/msg00021.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlMailing ListThird Party Advisory
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