CVE-2005-0236: The International Domain Name (IDN) support in Omniweb 5 allows remote attackers to spoof domain names using p

Routine

MEDIUM 5.0DOWNGRADE

CVE-2005-0236 is a medium-severity flaw (CVSS 5.0) affecting omniweb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The International Domain Name (IDN) support in Omniweb 5 allows remote attackers to spoof domain names using punycode encoded domain names that are decoded in URLs and SSL certificates in a way that uses homograph characters from other character sets, which facilitates phishing attacks.

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	1.0% (top 37%)
CISA exploited list	No
Published	2005-05-02
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: omnigroup

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

Am I affected?

Timeline

2005-05-02 04:00 UTCPublished CVE record published
2026-06-16 22:10 UTCUpdated Record last modified

omnigroup omniweb DOWNGRADE

Affected: 5

Fixed in: no fixed release known

Safe to downgrade to: a release before 5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5 (Debian / Ubuntu)

apt-cache madison omniweb sudo apt install omniweb=<VERSION_BEFORE_5> sudo apt-mark hold omniweb

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

dnf --showduplicates list omniweb sudo dnf downgrade omniweb-<VERSION_BEFORE_5> sudo dnf versionlock add omniweb

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-2005-0236?

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

Is CVE-2005-0236 being exploited?

CVE-2005-0236 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-2005-0236 affect?

CVE-2005-0236 affects omniweb. Severity is medium (CVSS 5.0). The International Domain Name (IDN) support in Omniweb 5 allows remote attackers to spoof domain names using punycode encoded domain names that are decoded in URLs and SSL certificates in a way that uses homograph characters from other char

How urgent is CVE-2005-0236?

Priority 38/100. Public exploit reference

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References

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