What is CVE-2019-11766?

CVE-2019-11766 is a critical-severity vulnerability in Dhcpcd Project, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2019-05-05.

How severe is CVE-2019-11766?

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

Out-of-bounds Read in Dhcpcd Project

CVE-2019-11766

dhcp6.c in dhcpcd before 6.11.7 and 7.x before 7.2.2 has a buffer over-read in the D6_OPTION_PD_EXCLUDE feature.

Vulnerability class: Buffer Overflow

Published 2019-05-05 · 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: 0.020 (81.1th percentile), scored 2026-10-29.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.020 · change: -0.001

Affected products

Dhcpcd Project
Debian Linux — versions 8.0, 9.0, 10.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

bugs.debian.org/928440 (Patch, Mailing List, Third Party Advisory)
roy.marples.name/archives/dhcpcd-discuss/0002428.html (Patch, Vendor Advisory)
roy.marples.name/cgit/dhcpcd.git/commit/ (Patch, Mailing List, Vendor Advisory)
roy.marples.name/cgit/dhcpcd.git/commit/ (Patch, Mailing List, Vendor Advisory)
www.securityfocus.com/bid/108172 (vdb-entry, Broken Link)

Frequently asked questions

What is CVE-2019-11766?: CVE-2019-11766 is a critical-severity vulnerability in Dhcpcd Project, classified under Out-of-bounds Read. CVSS score: 9.8/10. Published 2019-05-05.
How severe is CVE-2019-11766?: Critical severity. CVSS v3 base score is 9.8 out of 10.