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Vulnerability record · CVE-2022-39173 · published 29 September 2022

CVE-2022-39173: Wolfssl out-of-bounds write vulnerability

Wolfssl · Wolfssl

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.

7.5 CVSS 3.1 High EPSS 5.8% · top 7.2% CWE-787 · Out-of-bounds write
7.5CVSS 3.1 base score
5.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/169600/wolfSSL-Buffer-Overflow.html ExploitThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2022/Oct/24 Mailing ListThird Party Advisory
https://blog.trailofbits.com/2023/01/12/wolfssl-vulnerabilities-tlspuffin-fuzzing-ssh/
https://github.com/wolfSSL/wolfssl/releases Release NotesThird Party Advisory
https://www.wolfssl.com/docs/security-vulnerabilities/ Vendor Advisory
http://packetstormsecurity.com/files/169600/wolfSSL-Buffer-Overflow.html ExploitThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2022/Oct/24 Mailing ListThird Party Advisory
https://blog.trailofbits.com/2023/01/12/wolfssl-vulnerabilities-tlspuffin-fuzzing-ssh/
https://github.com/wolfSSL/wolfssl/releases Release NotesThird Party Advisory
https://www.wolfssl.com/docs/security-vulnerabilities/ Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2022-39173), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.