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CVE-2021-43398

5.3 · MEDIUM

Crypto++ (aka Cryptopp) 8.6.0 and earlier contains a timing leakage in MakePublicKey().

Published Nov 4, 2021CWE-203EPSS 1.96%

Overview

CVE-2021-43398 is a medium-severity vulnerability. It was published on November 4, 2021 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Crypto++ (aka Cryptopp) 8.6.0 and earlier contains a timing leakage in MakePublicKey(). There is a clear correlation between execution time and private key length, which may cause disclosure of the length information of the private key. This might allow attackers to conduct timing attacks. NOTE: this report is disputed by the vendor and multiple third parties. The execution-time differences are intentional. A user may make a choice of a longer key as a tradeoff between strength and performance. In making this choice, the amount of information leaked to an adversary is of infinitesimal value

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcryptopp.comGitHubgithub.com/weidai11/cryptopp/issues/1080GitHubgithub.com/weidai11/cryptopp/issues/1080#issuecomment-996492222Refcryptopp.comGitHubgithub.com/weidai11/cryptopp/issues/1080GitHubgithub.com/weidai11/cryptopp/issues/1080#issuecomment-996492222

How CyberStrike helps

Frequently asked questions

What is CVE-2021-43398?

CVE-2021-43398 is a medium-severity vulnerability. It was published on November 4, 2021 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2021-43398?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-43398?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-43398?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-43398 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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