What is CVE-2021-44429?

CVE-2021-44429 is a high-severity vulnerability in Vercot Serva, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-11-29.

How severe is CVE-2021-44429?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Vercot Serva

CVE-2021-44429

Serva 4.4.0 allows remote attackers to cause a denial of service (daemon crash) via a TFTP read (RRQ) request, aka opcode 1, a related issue to CVE-2013-0145.

Vulnerability class: Buffer Overflow

Published 2021-11-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.019 (79.2th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: +0.001

Affected products

Vercot Serva — versions 4.4.0

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

packetstormsecurity.com/files/165058/Serva-4.4.0-TFTP-Remote-Buffer-Overflow.ht… (Exploit, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-44429?: CVE-2021-44429 is a high-severity vulnerability in Vercot Serva, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-11-29.
How severe is CVE-2021-44429?: High severity. CVSS v3 base score is 7.5 out of 10.