CVE-2021-3328: An issue was discovered in Aprelium Abyss Web Server X1 2.12.1 and 2.14

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2021-3328 is a high-severity flaw (CVSS 7.5) affecting abyss web server x1. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-125
Published	2021-04-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: aprelium

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-04-08 18:15 UTCPublished CVE record published
2026-06-17 04:04 UTCUpdated Record last modified

aprelium abyss web server x1 DOWNGRADE

Affected: 2.12.1 · 2.14

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.12.1

1. Check installed version

apt-cache policy abyss-web-server-x1 || rpm -q abyss-web-server-x1 || abyss-web-server-x1 --version

2. No fixed release: DOWNGRADE to a release before 2.12.1 (Debian / Ubuntu)

apt-cache madison abyss-web-server-x1 sudo apt install abyss-web-server-x1=<VERSION_BEFORE_2.12.1> sudo apt-mark hold abyss-web-server-x1

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list abyss-web-server-x1 sudo dnf downgrade abyss-web-server-x1-<VERSION_BEFORE_2.12.1> sudo dnf versionlock add abyss-web-server-x1

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-3328?

abyss web server x1: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-3328 being exploited?

CVE-2021-3328 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-3328 affect?

CVE-2021-3328 affects abyss web server x1. Severity is high (CVSS 7.5). 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 urgent is CVE-2021-3328?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs