CVE-2020-36475 — Incorrect Calculation of Buffer Size in ARM Mbed TLS

CWE-131 — Incorrect Calculation of Buffer Size7 documents7 sources
Severity
7.5HIGHNVD
EPSS
1.0%
top 23.21%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
Mbed MbedtlsARM Mbed TLSSiemens Logo ! Cmr2020 Firmware+2 more
Timeline
PublishedAug 23
Latest updateMay 24

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages4 packages

▶NVDarm/mbed_tls2.8.0 — 2.16.9+2
▶Debianmbed/mbedtls< 2.16.9-0.1+3

Also affects: Debian Linux 10.0, 9.0

Patches

Patch: cert-portal.siemens.com ↗Patch: cert-portal.siemens.com ↗

🔴Vulnerability Details

3
GHSA
GHSA-7qm6-rr75-xc68: An issue was discovered in Mbed TLS before 2↗2022-05-24
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CVEList
CVE-2020-36475: An issue was discovered in Mbed TLS before 2↗2021-08-23
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OSV
CVE-2020-36475: An issue was discovered in Mbed TLS before 2↗2021-08-23
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📋Vendor Advisories

3
CISA ICS
Siemens LOGO! CMR and SIMATIC RTU 3000↗2021-09-14
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Microsoft
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 paramet↗2021-08-10
▶
Debian
CVE-2020-36475: mbedtls - An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and bef...↗2020
▶
CVE-2020-36475 — Incorrect Calculation of Buffer Size | cvebase