8.1

CVE-2021-3336: wolfssl Improper Certificate Validation

CVSS: 8.1v3.1HighModified
AliasesUBUNTU-CVE-2021-3336DEBIAN-CVE-2021-3336
Published 29-01-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-3336 is a high (CVSS 8.1) Improper Certificate Validation vulnerability in wolfssl. EPSS estimates a 0.79% chance of exploitation in the next 30 days, higher than 55.6% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (NVD)
EPSS score
0.79%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 29-01-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.79%

Chance of exploitation in the next 30 days

Percentile

56%

Versus all other CVEs

30-day change

0.00 pp

From 0.79% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.79%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • wolfssl< 4.6.0-3
Ubuntu1 product
  • wolfsslAll versions (No fix recorded)
Wolfssl1 product

3 vendors · 3 products

References

5 links