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CVE-2005-0233: The International Domain Name (IDN) support in Firefox 1.0, Camino .8.5, and Mozilla before 1.7.6 allows remot

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This week
HIGH 7.5DOWNGRADEDOWNGRADEUPGRADE

CVE-2005-0233 is a high-severity flaw (CVSS 7.5) affecting camino, firefox, mozilla. 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 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.

Why this priority

  • High severity
  • EPSS top 3%: very likely to be exploited
  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
EPSS exploit chance20.4% (top 3%)
CISA exploited listNo
Published2005-02-08
Last modified2026-06-16
Publisher (CNA): Red Hat, Inc. · Vendor: mozilla · omnigroup · opera · opera software

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

Am I affected?

Timeline

mozilla camino DOWNGRADE
Affected: 0.8.5
Fixed in: no fixed release known
Safe to downgrade to: a release before 0.8.5
1. Check installed version
apt-cache policy camino || rpm -q camino || camino --version
2. No fixed release: DOWNGRADE to a release before 0.8.5 (Debian / Ubuntu)
apt-cache madison camino sudo apt install camino=<VERSION_BEFORE_0.8.5> sudo apt-mark hold camino
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list camino sudo dnf downgrade camino-<VERSION_BEFORE_0.8.5> sudo dnf versionlock add camino
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.
mozilla firefox DOWNGRADE
Affected: 1.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.0
1. Check installed version
apt-cache policy firefox || rpm -q firefox || firefox --version
2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)
apt-cache madison firefox sudo apt install firefox=<VERSION_BEFORE_1.0> sudo apt-mark hold firefox
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list firefox sudo dnf downgrade firefox-<VERSION_BEFORE_1.0> sudo dnf versionlock add firefox
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.
mozilla mozilla UPGRADE
Affected: < 1.7.6
Fixed in: 1.7.6
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy mozilla || rpm -q mozilla || mozilla --version
2. UPGRADE to 1.7.6 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade mozilla
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade mozilla
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
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.
opera opera browser UPGRADE
Affected: <= 7.54
Fixed in: newer than 7.54
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy opera-browser || rpm -q opera-browser || opera-browser --version
2. UPGRADE to newer than 7.54 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade opera-browser
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade opera-browser
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
opera software opera web browser DOWNGRADE
Affected: 7.54
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.54
1. Check installed version
apt-cache policy opera-web-browser || rpm -q opera-web-browser || opera-web-browser --version
2. No fixed release: DOWNGRADE to a release before 7.54 (Debian / Ubuntu)
apt-cache madison opera-web-browser sudo apt install opera-web-browser=<VERSION_BEFORE_7.54> sudo apt-mark hold opera-web-browser
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list opera-web-browser sudo dnf downgrade opera-web-browser-<VERSION_BEFORE_7.54> sudo dnf versionlock add opera-web-browser
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-2005-0233?

camino: downgrade or apply the listed mitigation; firefox: downgrade or apply the listed mitigation; mozilla: upgrade to 1.7.6. Exact commands for each OS are on this page.

Is CVE-2005-0233 being exploited?

CVE-2005-0233 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-2005-0233 affect?

CVE-2005-0233 affects camino, firefox, mozilla. Severity is high (CVSS 7.5). 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

How urgent is CVE-2005-0233?

Priority 56/100. High severity; EPSS top 3%: very likely to be exploited; Public exploit reference

Software pages

Mozilla Firefox vulnerabilities

Related CVEs

References

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