CVE-2022-39173

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.

CVSS v3.1 NVD

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

EPSS

5.76% chance of exploitation in the next 30 days, 93rd percentile

Published

2022-09-29

Updated

2025-05-20

Proof-of-concept exploits (1)

• http://packetstormsecurity.com/files/169600/wolfSSL-Buffer-Overflow.html

Security advisories

• https://www.wolfssl.com/docs/security-vulnerabilities
• http://seclists.org/fulldisclosure/2022/Oct/24
• wolfSSL/wolfssl/releases

References

• CVE Record
• NVD entry