CVE-2021-24117

Name: CVE-2021-24117
Creator: NVD / NIST
Published: 2021-07-14T14:15:08.81+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.9/10EPSS 2.22%

Last modified Jun 17, 2026

CVE-2021-24117 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. In Apache Teaclave Rust SGX SDK 1.1.3, 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 2.22% chance of exploitation in the next 30 days.

Description

In Apache Teaclave Rust SGX SDK 1.1.3, 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

2.22%

80.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-203

Affected Software

Vendor	Product	Versions
Apache	Teaclave Sgx Sdk	1.1.3

References

https://docs.rs/crate/sgx_tstd/1.1.1Product, Third Party Advisory
https://github.com/UzL-ITS/util-lookup/blob/main/cve-vulnerability-publication.mdPatch, Third Party Advisory
https://github.com/dingelish/rust-base64/commit/a554b7ae880553db6dde8a387101a093911d5b2aIssue Tracking, Patch, Third Party Advisory
https://docs.rs/crate/sgx_tstd/1.1.1Product, Third Party Advisory
https://github.com/UzL-ITS/util-lookup/blob/main/cve-vulnerability-publication.mdPatch, Third Party Advisory
https://github.com/dingelish/rust-base64/commit/a554b7ae880553db6dde8a387101a093911d5b2aIssue Tracking, Patch, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-24117?

How severe is CVE-2021-24117?

CVE-2021-24117 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 2.22% probability of exploitation in the next 30 days.

How do I fix CVE-2021-24117?

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-2021-24117?

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

Scan your code now

Source: NVD / NIST