What is CVE-2019-16166?

CVE-2019-16166 is a medium-severity vulnerability in GNU Cflow, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2019-09-09.

How severe is CVE-2019-16166?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Out-of-bounds Read in GNU Cflow

CVE-2019-16166

GNU cflow through 1.6 has a heap-based buffer over-read in the nexttoken function in parser.c.

Vulnerability class: Buffer Overflow

Published 2019-09-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.011 (64.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

GNU Cflow

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

lists.gnu.org/archive/html/bug-cflow/2019-04/msg00000.html (Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2019-16166?: CVE-2019-16166 is a medium-severity vulnerability in GNU Cflow, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2019-09-09.
How severe is CVE-2019-16166?: Medium severity. CVSS v3 base score is 6.5 out of 10.