What is CVE-2019-13951?

CVE-2019-13951 is a critical-severity vulnerability in Gdnsd, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-07-18.

How severe is CVE-2019-13951?

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

Buffer overflow in Gdnsd

CVE-2019-13951

The set_ipv4() function in zscan_rfc1035.rl in gdnsd 3.x before 3.2.1 has a stack-based buffer overflow via a long and malformed IPv4 address in zone data.

Vulnerability class: Buffer Overflow

Published 2019-07-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.9th percentile), scored 2026-10-26.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Gdnsd — versions 3.2.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/gdnsd/gdnsd/issues/185 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-13951?: CVE-2019-13951 is a critical-severity vulnerability in Gdnsd, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-07-18.
How severe is CVE-2019-13951?: Critical severity. CVSS v3 base score is 9.8 out of 10.