What is CVE-2020-11735?

CVE-2020-11735 is a medium-severity vulnerability in Wolfssl, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2020-06-25.

How severe is CVE-2020-11735?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Wolfssl

CVE-2020-11735

The private-key operations in ecc.c in wolfSSL before 4.4.0 do not use a constant-time modular inverse when mapping to affine coordinates, aka a "projective coordinates leak."

Published 2020-06-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Wolfssl

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

github.com/wolfSSL/wolfssl/commit/1de07da61f0c8e9926dcbd68119f73230dae283f (Patch, Third Party Advisory)
github.com/wolfSSL/wolfssl/releases/tag/v4.4.0-stable (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2020-11735?: CVE-2020-11735 is a medium-severity vulnerability in Wolfssl, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2020-06-25.
How severe is CVE-2020-11735?: Medium severity. CVSS v3 base score is 5.3 out of 10.