CVE-2021-24116

Name: CVE-2021-24116
Creator: NVD / NIST
Published: 2021-07-14T13:15:08.063+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.9/10EPSS 1.04%

Last modified Jun 17, 2026

CVE-2021-24116 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. 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.. EPSS estimates a 1.04% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.9/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.04%

59.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-203

Affected Software

Vendor	Product	Versions
Wolfssl	Wolfssl	< 4.6.0

References

https://github.com/UzL-ITS/util-lookup/blob/main/cve-vulnerability-publication.mdRelease Notes, Third Party Advisory
https://github.com/wolfSSL/wolfssl/releasesRelease Notes, Third Party Advisory
https://github.com/UzL-ITS/util-lookup/blob/main/cve-vulnerability-publication.mdRelease Notes, Third Party Advisory
https://github.com/wolfSSL/wolfssl/releasesRelease Notes, Third Party Advisory

Timeline

Published: Jul 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-24116?

How severe is CVE-2021-24116?

CVE-2021-24116 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24116?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-24116?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST