CVE-2002-0543: Directory traversal vulnerability in Aprelium Abyss Web Server (abyssws) before 1.0.0.2 allows remote attacker

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MEDIUM 5.0DOWNGRADE

CVE-2002-0543 is a medium-severity flaw (CVSS 5.0) affecting abyss web server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory traversal vulnerability in Aprelium Abyss Web Server (abyssws) before 1.0.0.2 allows remote attackers to read files outside the web root, including the abyss.conf file, via URL-encoded .. (dot dot) sequences in the HTTP request.

Why this priority

EPSS top 4%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	9.8% (top 4%)
CISA exploited list	No
Published	2002-07-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: aprelium technologies

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2002-07-03 04:00 UTCPublished CVE record published
2026-06-16 21:57 UTCUpdated Record last modified

aprelium technologies abyss web server DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison abyss-web-server sudo apt install abyss-web-server=<VERSION_BEFORE_1.0> sudo apt-mark hold abyss-web-server

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

dnf --showduplicates list abyss-web-server sudo dnf downgrade abyss-web-server-<VERSION_BEFORE_1.0> sudo dnf versionlock add abyss-web-server

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Abyss Web Server 1.0 - File Disclosure

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-2002-0543?

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

Is CVE-2002-0543 being exploited?

CVE-2002-0543 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-2002-0543 affect?

CVE-2002-0543 affects abyss web server. Severity is medium (CVSS 5.0). Directory traversal vulnerability in Aprelium Abyss Web Server (abyssws) before 1.0.0.2 allows remote attackers to read files outside the web root, including the abyss.conf file, via URL-encoded .. (dot dot) sequences in the HTTP request.

How urgent is CVE-2002-0543?

Priority 46/100. EPSS top 4%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2003-1364 HIGH 8.5 DOWNGRADE Aprelium Technologies Abyss Web Server 1.1.2, and possibly other versions before 1.1.4, allows remote attacker
CVE-2003-1363 MEDIUM 6.4 UPGRADE The remote web management interface of Aprelium Technologies Abyss Web Server 1.1.2 and earlier does not log c
CVE-2003-1338 MEDIUM 4.3 UPGRADE CRLF injection vulnerability in Aprelium Abyss Web Server 1.1.2 and earlier allows remote attackers to inject
CVE-2003-1337 HIGH 7.5 UPGRADE Heap-based buffer overflow in Aprelium Abyss Web Server 1.1.2 and earlier allows remote attackers to execute a
CVE-2002-1081 MEDIUM 5.0 DOWNGRADE The Administration console for Abyss Web Server 1.0.3 allows remote attackers to read files without providing

References

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