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Vulnerability details: VCID-sy56-syz4-13gb
Vulnerability ID VCID-sy56-syz4-13gb
Aliases CVE-2020-36421
Summary An issue was discovered in Arm Mbed TLS before 2.23.0. Because of a side channel in modular exponentiation, an RSA private key used in a secure enclave could be disclosed.
Status Published
Exploitability 0.5
Weighted Severity 4.8
Risk 2.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-203 Observable Discrepancy
System Score Found at
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
epss 0.0019 https://api.first.org/data/v1/epss?cve=CVE-2020-36421
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2020-36421
cvssv3.1 5.3 https://nvd.nist.gov/vuln/detail/CVE-2020-36421
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2020-36421
https://bugs.gentoo.org/730752
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36421
https://github.com/ARMmbed/mbedtls/issues/3394
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.7
https://github.com/ARMmbed/mbedtls/releases/tag/v2.23.0
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
CVE-2020-36421 https://nvd.nist.gov/vuln/detail/CVE-2020-36421
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-36421
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-36421
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.41344
EPSS Score 0.0019
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T10:18:24.452168+00:00 NVD Importer Import https://nvd.nist.gov/vuln/detail/CVE-2020-36421 37.0.0