Vulnerability in Wolfssl
CVE-2021-3336
DoTls13CertificateVerify in tls13.c in wolfSSL before 4.7.0 does not cease processing for certain anomalous peer behavior (sending an ED22519, ED448, ECC, or RSA signature without the corresponding certificate). The client side is affected because man-in-the-middle attackers can impersonate TLS 1.3 servers.
Vulnerability class: Improper Certificate Validation
EPSS: 0.008 (52.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Wolfssl
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-3336?
- CVE-2021-3336 is a high-severity vulnerability in Wolfssl, classified under Improper Certificate Validation. CVSS score: 8.1/10. Published 2021-01-29.
- How severe is CVE-2021-3336?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2021-3336 known to be exploited?
- 15 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.