CVE-2021-24116

Severity: medium (CVSS 4.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-07-14 · updated 2026-06-17
Weakness: CWE-203

Description

In wolfSSL through 4.6.0, 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.

Affected products

wolfSSL: before 4.6.0 — fixed in 4.6.0

How to fix

Upgrade to a fixed version: wolfSSL 4.6.0. Check the vendor advisory for mitigations.

References

https://github.com/UzL-ITS/util-lookup/blob/main/cve-vulnerability-publication.md
https://github.com/wolfSSL/wolfssl/releases
https://github.com/UzL-ITS/util-lookup/blob/main/cve-vulnerability-publication.md
https://github.com/wolfSSL/wolfssl/releases

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