What’s Vulnerable › Vulnerabilities

CVE-2022-39173

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-09-29 · updated 2026-06-17
• Weakness: CWE-787

Description

In wolfSSL before 5.5.1, malicious clients can cause a buffer overflow during a TLS 1.3 handshake. This occurs when an attacker supposedly resumes a previous TLS session. During the resumption Client Hello a Hello Retry Request must be triggered. Both Client Hellos are required to contain a list of duplicate cipher suites to trigger the buffer overflow. In total, two Client Hellos have to be sent: one in the resumed session, and a second one as a response to a Hello Retry Request message.

Affected products

• wolfSSL: before 5.5.1 — fixed in 5.5.1

How to fix

Upgrade to a fixed version: wolfSSL 5.5.1. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/169600/wolfSSL-Buffer-Overflow.html
• http://seclists.org/fulldisclosure/2022/Oct/24
• https://blog.trailofbits.com/2023/01/12/wolfssl-vulnerabilities-tlspuffin-fuzzing-ssh/
• https://github.com/wolfSSL/wolfssl/releases
• https://www.wolfssl.com/docs/security-vulnerabilities/
• http://packetstormsecurity.com/files/169600/wolfSSL-Buffer-Overflow.html
• http://seclists.org/fulldisclosure/2022/Oct/24
• https://blog.trailofbits.com/2023/01/12/wolfssl-vulnerabilities-tlspuffin-fuzzing-ssh/
• https://github.com/wolfSSL/wolfssl/releases
• https://www.wolfssl.com/docs/security-vulnerabilities/

Get alerted when CVE-2022-39173 or the next vulnerability affects your stack