CVE-2001-0777: Omnicron OmniHTTPd 2.0.8 allows remote attackers to cause a denial of service (memory exhaustion) via a series

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MEDIUM 5.0DOWNGRADE

CVE-2001-0777 is a medium-severity flaw (CVSS 5.0) affecting omnihttpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Omnicron OmniHTTPd 2.0.8 allows remote attackers to cause a denial of service (memory exhaustion) via a series of requests for PHP scripts.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Published	2001-10-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: omnicron

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

Am I affected?

Timeline

2001-10-18 04:00 UTCPublished CVE record published
2026-06-16 21:54 UTCUpdated Record last modified

omnicron omnihttpd DOWNGRADE

Affected: 2.0.4 · 2.0.5 · 2.0.6 · 2.0.7 · 2.0.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.4

1. Check installed version

apt-cache policy omnihttpd || rpm -q omnihttpd || omnihttpd --version

2. No fixed release: DOWNGRADE to a release before 2.0.4 (Debian / Ubuntu)

apt-cache madison omnihttpd sudo apt install omnihttpd=<VERSION_BEFORE_2.0.4> sudo apt-mark hold omnihttpd

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

dnf --showduplicates list omnihttpd sudo dnf downgrade omnihttpd-<VERSION_BEFORE_2.0.4> sudo dnf versionlock add omnihttpd

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-2001-0777?

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

Is CVE-2001-0777 being exploited?

CVE-2001-0777 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-2001-0777 affect?

CVE-2001-0777 affects omnihttpd. Severity is medium (CVSS 5.0). Omnicron OmniHTTPd 2.0.8 allows remote attackers to cause a denial of service (memory exhaustion) via a series of requests for PHP scripts.

How urgent is CVE-2001-0777?

Priority 42/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2002-1455 MEDIUM 4.3 MITIGATE Multiple cross-site scripting (XSS) vulnerabilities in OmniHTTPd allow remote attackers to insert script or HT
CVE-2002-1035 MEDIUM 5.0 DOWNGRADE Omnicron OmniHTTPd 2.09 allows remote attackers to cause a denial of service (crash) via an HTTP request with
CVE-2001-0778 MEDIUM 5.0 UPGRADE OmniHTTPd 2.0.8 and earlier allow remote attackers to obtain source code via a GET request with the URL-encode
CVE-2001-0613 MEDIUM 5.0 UPGRADE Omnicron Technologies OmniHTTPD Professional 2.08 and earlier allows a remote attacker to create a denial of s
CVE-2001-0114 MEDIUM 5.0 DOWNGRADE statsconfig.pl in OmniHTTPd 2.07 allows remote attackers to overwrite arbitrary files via the cgidir parameter

References

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