What is CVE-2021-3398?

CVE-2021-3398 is a medium-severity vulnerability in Stormshield Network Security, classified under Integer Overflow or Wraparound. CVSS score: 5.8/10. Published 2022-02-10.

How severe is CVE-2021-3398?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Integer overflow in Stormshield Network Security

CVE-2021-3398

Stormshield Network Security (SNS) 3.x has an Integer Overflow in the high-availability component.

Vulnerability class: Integer Overflow

Published 2022-02-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.009 (58.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Stormshield Network Security

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

www.stormshield.com/category/alert/ (Vendor Advisory)
advisories.stormshield.eu/2021-001/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-3398?: CVE-2021-3398 is a medium-severity vulnerability in Stormshield Network Security, classified under Integer Overflow or Wraparound. CVSS score: 5.8/10. Published 2022-02-10.
How severe is CVE-2021-3398?: Medium severity. CVSS v3 base score is 5.8 out of 10.