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Opera BrowserApplication · Opera

CVE-2009-3049

MEDIUM · 5.0 CVSS v2.0 Published 2009-09-02
Fix available
A fix is available. Upgrade to after 10.00 or later.
See remediation →
59/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Opera before 10.00 does not properly display all characters in Internationalized Domain Names (IDN) in the address bar, which allows remote attackers to spoof URLs and conduct phishing attacks, related to Unicode and Punycode.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Opera before version 10.00 fails to properly render Unicode characters in Internationalized Domain Names (IDN) within the address bar, allowing visually similar characters (homoglyphs) to spoof legitimate domain names and facilitate phishing attacks through improper Unicode-to-Punycode conversion.

MitigationUpgrade to Opera 10.00 or later, which implements proper IDN display controls and Punycode encoding in the address bar to prevent URL spoofing.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Opera BrowserApplication
Affected:<= 10.00= 7.0= 7.23= 7.53= 7.54= 7.60= 8.0= 8.01= 8.02= 8.50= 8.51= 8.52

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None

AV:N/AC:L/Au:N/C:N/I:P/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed Opera version
    Open Opera, go to Help > About Opera or press Alt+H about Opera. The version number is displayed in the dialog.
    Affected if The version is 10.00 or lower, or specifically 7.0, 7.23, 7.53, 7.54, 7.60, 8.0, 8.01, 8.02, 8.50, 8.51, or 8.52.
  2. Confirm IDN support is present
    Check if Internationalized Domain Names are supported by attempting to visit a domain with non-ASCII characters, or check Opera preferences under Advanced > Network for IDN settings.
    Affected if IDN is supported and the version is vulnerable.
  3. Check address bar behavior with IDN
    Visit a test IDN domain (a domain containing non-ASCII characters) and observe how it appears in the address bar.
    Affected if The address bar displays Unicode characters instead of converting them to Punycode format (beginning with xn--).

If Opera version is 10.00 or lower and IDN domains display as Unicode characters rather than Punycode in the address bar, the environment is affected by this vulnerability.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Upgrade available Upgrade to a release after 10.00
Interim mitigation

Upgrade to Opera 10.00 or later, which implements proper IDN display controls and Punycode encoding in the address bar to prevent URL spoofing.

Fix this in Opera Browser Scoped from the published advisory
  • Consultation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
3.0 hours of engineering $750
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2009-3049 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data