CVE-2001-0647: Orange Web Server 2.1, based on GoAhead, allows a remote attacker to perform a denial of service via an HTTP G

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MEDIUM 5.0DOWNGRADE

CVE-2001-0647 is a medium-severity flaw (CVSS 5.0) affecting orange web server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Orange Web Server 2.1, based on GoAhead, allows a remote attacker to perform a denial of service via an HTTP GET request that does not include the HTTP version.

Why this priority

EPSS top 8%: 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	5.2% (top 8%)
CISA exploited list	No
Published	2001-08-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: orange software

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

Am I affected?

Timeline

2001-08-06 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

orange software orange web server DOWNGRADE

Affected: 2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.1 (Debian / Ubuntu)

apt-cache madison orange-web-server sudo apt install orange-web-server=<VERSION_BEFORE_2.1> sudo apt-mark hold orange-web-server

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

dnf --showduplicates list orange-web-server sudo dnf downgrade orange-web-server-<VERSION_BEFORE_2.1> sudo dnf versionlock add orange-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: Orange Software Orange Web Server 2.1 - Denial of Service

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-2001-0647?

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

Is CVE-2001-0647 being exploited?

CVE-2001-0647 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-2001-0647 affect?

CVE-2001-0647 affects orange web server. Severity is medium (CVSS 5.0). Orange Web Server 2.1, based on GoAhead, allows a remote attacker to perform a denial of service via an HTTP GET request that does not include the HTTP version.

How urgent is CVE-2001-0647?

Priority 46/100. EPSS top 8%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2002-0680 MEDIUM 5.0 DOWNGRADE DOWNGRADE Directory traversal vulnerability in GoAhead Web Server 2.1 allows remote attackers to read arbitrary files vi

References

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