What is CVE-2019-19962?

CVE-2019-19962 is a high-severity vulnerability in Wolfssl, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2019-12-25.

How severe is CVE-2019-19962?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2019-19962 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Wolfssl

CVE-2019-19962

wolfSSL before 4.3.0 mishandles calls to wc_SignatureGenerateHash, leading to fault injection in RSA cryptography.

Published 2019-12-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (58.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Wolfssl

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

Public proof-of-concept exploits

References

github.com/wolfSSL/wolfssl/releases/tag/v4.3.0-stable (Third Party Advisory, Release Notes)
github.com/wolfSSL/wolfssl/commit/23878512c65834d12811b1107d19a001478eca5d (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2019-19962?: CVE-2019-19962 is a high-severity vulnerability in Wolfssl, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2019-12-25.
How severe is CVE-2019-19962?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2019-19962 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.