How severe is CVE-2021-3328?

CVE-2021-3328 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-3328 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3328?

CVE-2021-3328 primarily affects Aprelium Abyss Web Server X1. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-3328?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-3328 published?

CVE-2021-3328 was published on 2021-04-08 and last updated on 2026-06-17.

CVE-2021-3328

CVE-2021-3328 is a high-severity vulnerability in Aprelium Abyss Web Server X1 with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Aprelium Abyss Web Server X1
Published: 2021-04-08
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2021-3328?: CVE-2021-3328 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-3328 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3328?: CVE-2021-3328 primarily affects Aprelium Abyss Web Server X1. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3328?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-3328 published?: CVE-2021-3328 was published on 2021-04-08 and last updated on 2026-06-17.

References

https://jankopecky.net/index.php/2021/04/08/cve-2021-3328-abyss-web-server-remote-dos/

Affected products (2)

cpe:2.3:a:aprelium:abyss_web_server_x1:2.12.1:*:*:*:*:*:*:*
cpe:2.3:a:aprelium:abyss_web_server_x1:2.14:*:*:*:*:*:*:*

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