In wolfSSL through 4.1.0, there is a missing sanity check of memory accesses in parsing ASN.1 certificate data while handshaking.

published 2019-09-24 7y ago modified 2026-06-17 4mo ago also EUVD-2019-7288

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits: 0; none known

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.

Patch / fix

distros 1

wolfssl Debian 13, Debian 12 4.2.0+dfsg-1

debian advisories DEBIAN-CVE-2019-16748

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-23-131-14 updated 2023-05-11 cvss 7.8

Rockwell Automation PanelView 800

Rockwell Automation PanelView 800-2711R-T4T 5.011, < 8.011 Rockwell Automation PanelView 800-2711R-T7T 5.011, < 8.011 Rockwell Automation PanelView 800-2711R-T10T 5.011, < 8.011
affected: fixed in V8.011 compatibility.rockwellautomation.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.16% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-125 Out-of-bounds Read

References

github.com /wolfSSL/wolfssl/issues/2459
third-party-advisory

Sources

CVE List CVE-2019-16748
NVD CVE-2019-16748

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