What is CVE-2021-3328?

CVE-2021-3328 is a high-severity vulnerability in Aprelium Abyss Web Server X1, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2021-04-08.

How severe is CVE-2021-3328?

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

Out-of-bounds Read in Aprelium Abyss Web Server X1

CVE-2021-3328

An issue was discovered in Aprelium Abyss Web Server X1 2.12.1 and 2.14. A crafted HTTP request can lead to an out-of-bounds read that crashes the application.

Vulnerability class: Buffer Overflow

Published 2021-04-08 · 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: 0.018 (77.8th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.8% 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

Aprelium Abyss Web Server X1 — versions 2.12.1, 2.14

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

jankopecky.net/index.php/2021/04/08/cve-2021-3328-abyss-web-server-remote-dos/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3328?: CVE-2021-3328 is a high-severity vulnerability in Aprelium Abyss Web Server X1, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2021-04-08.
How severe is CVE-2021-3328?: High severity. CVSS v3 base score is 7.5 out of 10.