CVE-2021-24119

moderate-risk
Published 2021-07-14

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.

Do I need to act?

-
0.68% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.9/10 Medium
NETWORK / LOW complexity

Affected Products (5)

Affected Vendors

Debian Fedoraproject Arm

References (13)

Release Notes https://github.com/ARMmbed/mbedtls/releases
Release Notes https://github.com/UzL-ITS/util-lookup/blob/main/cve-vulnerability-publication.m...
Mailing List https://lists.debian.org/debian-lts-announce/2021/11/msg00021.html
Mailing List https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Release Notes https://github.com/ARMmbed/mbedtls/releases
Release Notes https://github.com/UzL-ITS/util-lookup/blob/main/cve-vulnerability-publication.m...
Mailing List https://lists.debian.org/debian-lts-announce/2021/11/msg00021.html
Mailing List https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html
Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
34
/ 100
moderate-risk
Severity 20/34 · Moderate
Exploitability 2/34 · Minimal
Exposure 12/34 · Low