Search for vulnerabilities
Vulnerability details: VCID-ab7z-b5a3-xuex
Vulnerability ID VCID-ab7z-b5a3-xuex
Aliases CVE-2020-36478
Summary An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS). A NULL algorithm parameters entry looks identical to an array of REAL (size zero) and thus the certificate is considered valid. However, if the parameters do not match in any way, then the certificate should be considered invalid.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-295 Improper Certificate Validation
System Score Found at
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-36478
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2020-36478
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2020-36478
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2020-36478
https://cert-portal.siemens.com/productcert/pdf/ssa-756638.pdf
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36478
https://github.com/ARMmbed/mbedtls/issues/3629
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9
https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0
https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18
https://lists.debian.org/debian-lts-announce/2021/11/msg00021.html
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:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
CVE-2020-36478 https://nvd.nist.gov/vuln/detail/CVE-2020-36478
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-36478
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:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-36478
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 0.48671
EPSS Score 0.00254
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T10:19:53.294749+00:00 NVD Importer Import https://nvd.nist.gov/vuln/detail/CVE-2020-36478 37.0.0