What’s Vulnerable › Vulnerabilities

CVE-2018-12436

• Severity: medium (CVSS 4.7 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-15 · updated 2026-06-17
• Weakness: CWE-200

Description

wolfcrypt/src/ecc.c in wolfSSL before 3.15.1.patch allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

Affected products

• wolfSSL: before 3.15.3 — fixed in 3.15.3

How to fix

Upgrade to a fixed version: wolfSSL 3.15.3. Check the vendor advisory for mitigations.

References

• https://github.com/wolfSSL/wolfssl/commit/9b9568d500f31f964af26ba8d01e542e1f27e5ca
• https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/
• https://www.wolfssl.com/wolfssh-and-rohnp/
• https://github.com/wolfSSL/wolfssl/commit/9b9568d500f31f964af26ba8d01e542e1f27e5ca
• https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/
• https://www.wolfssl.com/wolfssh-and-rohnp/

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