CVE-2021-24119 Information disclosure in n/a
System-level attackers can extract secret RSA keys from Mbed TLS via side-channel attacks on base64 decoding in isolated environments like Intel SGX.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-24119?
CVE-2021-24119 is a medium-severity vulnerability in Arm Mbed Tls, published on 14 Jul 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
In Trusted Firmware Mbed TLS 2.24.0, a side-channel vulnerability in base64 PEM file decoding allows system-level (administrator) attackers to obtain information about secret RSA keys via a controlled-channel and side-channel attack on software running in isolated environments that can be single stepped, especially Intel SGX.
Weakness: CWE-203
Which versions are affected by CVE-2021-24119?
It affects 3 products.
Linux distribution packages (5)
mbedtls SUSE:Package Hub 15 SP2 | All versions | 2.16.9-bp152.2.6.1 |
mbedtls SUSE:Package Hub 15 SP3 | All versions | 2.16.9-bp153.2.5.1 |
mbedtls openSUSE:Leap 15.2 | All versions | 2.16.9-lp152.2.6.1 |
mbedtls openSUSE:Leap 15.3 | All versions | 2.16.9-bp153.2.5.1 |
mbedtls-2 openSUSE:Tumbleweed | All versions | 2.27.0-2.1 |
Products include Arm Mbed Tls, Debian Debian Linux, Fedoraproject Fedora.
How do I fix CVE-2021-24119?
Upgrade to a fixed version.
Is CVE-2021-24119 being exploited?
There is no known exploitation of CVE-2021-24119 in the wild and no public exploit code.
Other vulnerabilities in Arm Mbed Tls
Sources
Also known as DEBIAN-CVE-2021-24119, GHSA-7wc7-36pp-g93m, JLSEC-2025-203, UBUNTU-CVE-2021-24119, openSUSE-SU-2021:1344-1, openSUSE-SU-2021:1355-1 and 2 more.