What is CVE-2019-14431?

CVE-2019-14431 is a critical-severity vulnerability in Matrixssl, classified under Improper Handling of Exceptional Conditions. CVSS score: 9.8/10. Published 2019-07-29.

How severe is CVE-2019-14431?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2019-14431 known to be exploited?

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

Buffer overflow in Matrixssl

CVE-2019-14431

In MatrixSSL 3.8.3 Open through 4.2.1 Open, the DTLS server mishandles incoming network messages leading to a heap-based buffer overflow of up to 256 bytes and possible Remote Code Execution in parseSSLHandshake in sslDecode.c. During processing of a crafted packet, the server mishandles the fragment length value provided in the DTLS message.

Published 2019-07-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.036 (89.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.036 · newest: 0.036 · change: 0.000

Affected products

Matrixssl

Weakness classification (CWE)

Public proof-of-concept exploits

References

github.com/matrixssl/matrixssl/issues/30 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2019-14431?: CVE-2019-14431 is a critical-severity vulnerability in Matrixssl, classified under Improper Handling of Exceptional Conditions. CVSS score: 9.8/10. Published 2019-07-29.
How severe is CVE-2019-14431?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2019-14431 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.