PT-2021-6689 · Arm+2 · Arm Mbed Tls+2

Raoul Strackx + 1 · Published 2020-09-02 · Updated 2025-08-21 · CVE-2020-36425

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Arm Mbed TLS versions prior to 2.24.0

Description The issue is related to the incorrect use of a revocationDate check when deciding whether to honor certificate revocation via a CRL. This can be exploited by an attacker in certain situations by changing the local clock, potentially affecting data integrity.

Recommendations For Arm Mbed TLS versions prior to 2.24.0, update to version 2.24.0 or later to resolve the issue. As a temporary workaround, consider restricting access to certificate revocation lists (CRLs) to minimize the risk of exploitation.

Exploit

Fix

Improper Certificate Validation

Weakness Enumeration

CWE-295

Related Identifiers

ALT-PU-2020-2711

ALT-PU-2021-2234

ALT-PU-2025-10462

BDU:2022-02043

CVE-2020-36425

DLA-3249-1

Affected Products

Alt Linux

Arm Mbed Tls

Astra Linux

References · 18

• 🔥 https://github.com/ARMmbed/mbedtls/issues/3340 · Exploit
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-36425 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-36425 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-36425 · Security Note
• https://cve.org/CVERecord?id=CVE-2020-36425 · Security Note
• https://bdu.fstec.ru/vul/2022-02043 · Security Note
• https://bugs.gentoo.org/740108 · Patch
• https://ubuntu.com/security/CVE-2020-36425 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-36425 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-3249-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-36425 · Vendor Advisory
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.17 · Note
• https://github.com/ARMmbed/mbedtls/pull/3433 · Note
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0 · Note
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.8 · Note