Buffer overflow in Wolfssl
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.058 (92.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 92.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.045 · newest: 0.058 · change: +0.013
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.wolfssl.com/docs/security-vulnerabilities/ (Vendor Advisory)
- github.com/wolfSSL/wolfssl/releases (Third Party Advisory, Release Notes)
- seclists.org/fulldisclosure/2022/Oct/24 (mailing-list, Mailing List, Third Party Advisory)
- packetstormsecurity.com/files/169600/wolfSSL-Buffer-Overflow.html (Exploit, VDB Entry, Third Party Advisory)
- blog.trailofbits.com/2023/01/12/wolfssl-vulnerabilities-tlspuffin-fuzzing-ssh/
Frequently asked questions
- What is CVE-2022-39173?
- CVE-2022-39173 is a high-severity vulnerability in Wolfssl, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2022-09-29.
- How severe is CVE-2022-39173?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2022-39173 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.