CVE-2005-0233

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 20.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2005-02-08 · updated 2026-06-16

Description

The International Domain Name (IDN) support in Firefox 1.0, Camino .8.5, and Mozilla before 1.7.6 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.

Affected products

Mozilla Camino: 0.8.5
Mozilla Firefox: 1.0
Mozilla: before 1.7.6 — fixed in 1.7.6
Omnigroup Omniweb: 5
Opera Browser: through 7.54
Opera Software Opera Web Browser: 7.54

How to fix

Upgrade to a fixed version: Mozilla 1.7.6. Check the vendor advisory for mitigations.

References

http://lists.grok.org.uk/pipermail/full-disclosure/2005-February/031459.html
http://marc.info/?l=bugtraq&m=110782704923280&w=2
http://www.gentoo.org/security/en/glsa/glsa-200503-10.xml
http://www.gentoo.org/security/en/glsa/glsa-200503-30.xml
http://www.mozilla.org/security/announce/mfsa2005-29.html
http://www.novell.com/linux/security/advisories/2005_16_mozilla_firefox.html
http://www.redhat.com/support/errata/RHSA-2005-176.html
http://www.redhat.com/support/errata/RHSA-2005-384.html
http://www.securityfocus.com/bid/12461
http://www.shmoo.com/idn
http://www.shmoo.com/idn/homograph.txt
https://exchange.xforce.ibmcloud.com/vulnerabilities/19236

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