PT-2021-6568 · Arm+2 · Mbed Tls+2

Kfyatek · Published 2020-09-02 · Updated 2026-02-21 · CVE-2020-36426

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

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

Description The issue is related to a buffer over-read in the mbedtls x509 crl parse der function, which can lead to a denial of service. This can be exploited by a remote attacker. The function is part of the Mbed TLS implementation of TLS and SSL protocols.

Recommendations For 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 the mbedtls x509 crl parse der function until a patch is available.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

ALT-PU-2020-2711

ALT-PU-2021-2234

ALT-PU-2025-10462

BDU:2022-01834

CVE-2020-36426

DLA-3249-1

Affected Products

Alt Linux

Astra Linux

Mbed Tls

References · 16

• https://nvd.nist.gov/vuln/detail/CVE-2020-36426 · Security Note
• https://ubuntu.com/security/CVE-2020-36426 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-36426 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-36426 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-36426 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-36426 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-36426 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-3249-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-01834 · Security Note
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.17 · Note
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0 · Note
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.8 · Note
• https://t.me/cvenotify/18301 · Telegram Post
• https://bugs.gentoo.org/740108 · Note
• https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html · Note