CVE-2022-39173
highpriority · track · 32EPSS 0.058 · 93 %ileEUUSEPSS · scored 2026-10-28
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (17)
External citations — patches, advisories, analysis.
- http://seclists.org/fulldisclosure/2022/Oct/24cnnvd
- https://blog.trailofbits.com/2023/01/12/wolfssl-vulnerabilities-tlspuffin-fuzzing-ssh/cnnvd
- https://cxsecurity.com/cveshow/CVE-2022-39173/cnnvd
- https://cxsecurity.com/issue/WLB-2022100070cnnvd
- https://github.com/wolfSSL/wolfssl/releasescnnvd
- https://packetstormsecurity.com/files/169600/wolfSSL-Buffer-Overflow.htmlcnnvd
- https://www.wolfssl.com/docs/security-vulnerabilities/cnnvd
- http://packetstormsecurity.com/files/169600/wolfSSL-Buffer-Overflow.htmlenisa_euvd
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