What is CVE-2021-29999?

CVE-2021-29999 is a critical-severity vulnerability in Windriver Vxworks, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-04-13.

How severe is CVE-2021-29999?

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

Buffer overflow in Windriver Vxworks

CVE-2021-29999

An issue was discovered in Wind River VxWorks through 6.8. There is a possible stack overflow in dhcp server.

Vulnerability class: Buffer Overflow

Published 2021-04-13 · 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: 0.018 (77.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Windriver Vxworks

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

support2.windriver.com/index.php (Vendor Advisory)

Frequently asked questions

What is CVE-2021-29999?: CVE-2021-29999 is a critical-severity vulnerability in Windriver Vxworks, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-04-13.
How severe is CVE-2021-29999?: Critical severity. CVSS v3 base score is 9.8 out of 10.