Vulnerability · Published Jan 29, 2021 · Assigned by mitre
CVE-2021-3336
High 8.1
In plain English
A high-severity security flaw in the wolfssl package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.1High
Exploit odds (30 days)0.8%top 43.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | wolfssl | 4.6.0-3 | DEBIAN-CVE-2021-3336 |
| Debian:13 | wolfssl | 4.6.0-3 | DEBIAN-CVE-2021-3336 |
| Ubuntu:22.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2021-3336 |
| Ubuntu:24.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2021-3336 |
| Ubuntu:25.10 | wolfssl | no fix listed | UBUNTU-CVE-2021-3336 |
| Ubuntu:26.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2021-3336 |
| Ubuntu:26.10 | wolfssl | no fix listed | UBUNTU-CVE-2021-3336 |
Affected products (as reported)
References
- https://github.com/wolfSSL/wolfssl/pull/3676 x_refsource_MISC
- https://www.wolfssl.com/docs/security-vulnerabilities x_refsource_CONFIRM