What’s Vulnerable › Vulnerabilities

CVE-2020-36177

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-01-06 · updated 2026-06-17
• Weakness: CWE-787

Description

RsaPad_PSS in wolfcrypt/src/rsa.c in wolfSSL before 4.6.0 has an out-of-bounds write for certain relationships between key size and digest size.

Affected products

• wolfSSL: before 4.6.0 — fixed in 4.6.0

How to fix

Upgrade to a fixed version: wolfSSL 4.6.0. Check the vendor advisory for mitigations.

References

• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26567
• https://github.com/wolfSSL/wolfssl/commit/63bf5dc56ccbfc12a73b06327361687091a4c6f7
• https://github.com/wolfSSL/wolfssl/commit/fb2288c46dd4c864b78f00a47a364b96a09a5c0f
• https://github.com/wolfSSL/wolfssl/pull/3426
• https://github.com/wolfSSL/wolfssl/releases/tag/v4.6.0-stable
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26567
• https://github.com/wolfSSL/wolfssl/commit/63bf5dc56ccbfc12a73b06327361687091a4c6f7
• https://github.com/wolfSSL/wolfssl/commit/fb2288c46dd4c864b78f00a47a364b96a09a5c0f
• https://github.com/wolfSSL/wolfssl/pull/3426
• https://github.com/wolfSSL/wolfssl/releases/tag/v4.6.0-stable

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