CVE-2019-16748

Name: CVE-2019-16748
Creator: NVD / NIST
Published: 2019-09-24T13:15:10.66+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.15%

Last modified Jun 17, 2026

CVE-2019-16748 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. In wolfSSL through 4.1.0, there is a missing sanity check of memory accesses in parsing ASN.1 certificate data while handshaking. Specifically, there is a one-byte heap-based buffer over-read in CheckCertSignature_ex in wolfcrypt/src/asn.c.. EPSS estimates a 1.15% chance of exploitation in the next 30 days.

Description

In wolfSSL through 4.1.0, there is a missing sanity check of memory accesses in parsing ASN.1 certificate data while handshaking. Specifically, there is a one-byte heap-based buffer over-read in CheckCertSignature_ex in wolfcrypt/src/asn.c.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.15%

63.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Wolfssl	Wolfssl	<= 4.1.0

References

https://github.com/wolfSSL/wolfssl/issues/2459Third Party Advisory
https://github.com/wolfSSL/wolfssl/issues/2459Third Party Advisory

Timeline

Published: Sep 24, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-16748?

How severe is CVE-2019-16748?

CVE-2019-16748 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.15% probability of exploitation in the next 30 days.

How do I fix CVE-2019-16748?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-16748?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST