What’s Vulnerable › Vulnerabilities

CVE-2021-38597

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-12 · updated 2026-06-17
• Weakness: CWE-345

Description

wolfSSL before 4.8.1 incorrectly skips OCSP verification in certain situations of irrelevant response data that contains the NoCheck extension.

Affected products

• wolfSSL: before 4.8.1 — fixed in 4.8.1

How to fix

Upgrade to a fixed version: wolfSSL 4.8.1. Check the vendor advisory for mitigations.

References

• https://github.com/wolfSSL/wolfssl/commit/f93083be72a3b3d956b52a7ec13f307a27b6e093
• https://www.wolfssl.com/docs/wolfssl-changelog/
• https://github.com/wolfSSL/wolfssl/commit/f93083be72a3b3d956b52a7ec13f307a27b6e093
• https://www.wolfssl.com/docs/wolfssl-changelog/

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