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.
CVE-2005-0233
HIGHCVSS v2 · 7.57.5—Elevated
EchelonGraph scoreLOW confidence
This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.5 — v2 rates that HIGH (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:P/I:P/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 20.4% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.
Sources: epss, nvd_v2
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 20%CVSS v2: 7.5Exploit: Elevated riskExposed services: Not assessed
A fix is available — apply it.
- CVSS v2.0 (legacy)
- 7.5HIGHNVD never assigned a CVSS v3 rating to this CVE
- EG Score
- 7.5HIGHlow confidence
- EG Risk
- 54EG Risk 54/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity75% × 45%Exploitation40% × 40%Automatability30% × 15%CISA SSVC: Track at low, Track or Track* at medium and Track* or Attend at high mission impact.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 20%
- EPSS %ILE
- 97th
- KEV
- Not listed
CISA SSVCTrack at low, Track or Track* at medium and Track* or Attend at high mission impact.
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
February 8, 2005
Last Modified
June 16, 2026
References (28)
- secalert@redhathttp://lists.grok.org.uk/pipermail/full-disclosure/2005-February/031459.html
- secalert@redhathttp://marc.info/?l=bugtraq&m=110782704923280&w=2
- secalert@redhathttp://www.gentoo.org/security/en/glsa/glsa-200503-10.xml
- secalert@redhathttp://www.gentoo.org/security/en/glsa/glsa-200503-30.xml
- secalert@redhathttp://www.mozilla.org/security/announce/mfsa2005-29.html
- secalert@redhathttp://www.novell.com/linux/security/advisories/2005_16_mozilla_firefox.html
- secalert@redhathttp://www.redhat.com/support/errata/RHSA-2005-176.html
- secalert@redhathttp://www.redhat.com/support/errata/RHSA-2005-384.html
- secalert@redhathttp://www.securityfocus.com/bid/12461
- secalert@redhathttp://www.shmoo.com/idn
- secalert@redhathttp://www.shmoo.com/idn/homograph.txt
- secalert@redhathttps://exchange.xforce.ibmcloud.com/vulnerabilities/19236
- secalert@redhathttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A100029
- secalert@redhathttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11229
- af854a3a-2127-422b-91ae-364da2661108http://lists.grok.org.uk/pipermail/full-disclosure/2005-February/031459.html
Patch Availability(2)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | mozilla-firefox-locale-pl () @ warty | 2026-05-31 | ubuntu |
| redhat | firefox-0:1.0.1-1.4.3 | 2005-03-01 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
All Vendor Advisories
(2)
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Related CVEs(same vendor)
Frequently asked(4)
What is CVE-2005-0233?
CVE-2005-0233 is a high vulnerability published on February 8, 2005. 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…
When was CVE-2005-0233 disclosed?
CVE-2005-0233 was first published on February 8, 2005, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2005-0233 actively exploited?
CVE-2005-0233 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20% probability of exploitation in the next 30 days (97th percentile of EPSS-scored CVEs).
How do I remediate CVE-2005-0233?
A fix for CVE-2005-0233 is available: update to the fixed version the vendor names in its advisory.
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