CVE-2020-36426 Memory corruption in n/a
A buffer over-read in Mbed TLS allows attackers to cause denial of service or disclose sensitive memory contents via crafted CRLs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-36426?
CVE-2020-36426 is a high-severity memory corruption vulnerability in Arm Mbed Tls, published on 19 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in Arm Mbed TLS before 2.24.0. mbedtls_x509_crl_parse_der has a buffer over-read (of one byte).
Weakness: CWE-125
Which versions are affected by CVE-2020-36426?
It affects 2 products.
Products include Arm Mbed Tls, Debian Debian Linux.
How do I fix CVE-2020-36426?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-36426 being exploited?
There is no known exploitation of CVE-2020-36426 in the wild and no public exploit code.
Other vulnerabilities in Arm Mbed Tls
Sources
Also known as DEBIAN-CVE-2020-36426, GHSA-jw2m-7hxw-f6q8, JLSEC-2025-209, UBUNTU-CVE-2020-36426.