What’s Vulnerable › Vulnerabilities

CVE-2018-16870

• Severity: medium (CVSS 5.9 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-01-03 · updated 2026-06-17
• Weakness: CWE-200

Description

It was found that wolfssl before 3.15.7 is vulnerable to a new variant of the Bleichenbacher attack to perform downgrade attacks against TLS. This may lead to leakage of sensible data.

Affected products

• wolfSSL: before 3.15.7 — fixed in 3.15.7

How to fix

Upgrade to a fixed version: wolfSSL 3.15.7. Check the vendor advisory for mitigations.

References

• http://cat.eyalro.net/
• https://github.com/wolfSSL/wolfssl/pull/1950
• http://cat.eyalro.net/
• https://github.com/wolfSSL/wolfssl/pull/1950

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