---
title: "CVE-2024-45410: HTTP client can manipulate custom HTTP headers that are added by Traefik"
url: https://erroneo.us/security/cve/CVE-2024-45410/
description: "CVE-2024-45410 (github.com/traefik/traefik/v3 (Go)): Traefik is a golang, Cloud Native Application Proxy. When a HTTP request is processed by Traefik…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-09-19
date_modified: 2024-09-25
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-45410"
kev: false
cvss: 9.3
epss: 0.01513
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-45410: HTTP client can manipulate custom HTTP headers that are added by Traefik

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.5% , percentile 74: FIRST’s model estimates a 1.5% chance of exploitation activity in the next 30 days, higher than 74% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/traefik/traefik/v3 (Go) >= 3.0.0-beta3, < 3.1.3, fixed in 3.1.3 ; github.com/traefik/traefik/v2 (Go) < 2.11.9, fixed in 2.11.9 ; github.com/traefik/traefik (Go) < 2.11.9, fixed in 2.11.9 . Check your lockfile, including transitive dependencies.

## What it is

Traefik is a golang, Cloud Native Application Proxy. When a HTTP request is processed by Traefik, certain HTTP headers such as X-Forwarded-Host or X-Forwarded-Port are added by Traefik before the request is routed to the application. For a HTTP client, it should not be possible to remove or modify these headers. Since the application trusts the value of these headers, security implications might arise, if they can be modified. For HTTP/1.1, however, it was found that some of theses custom headers can indeed be removed and in certain cases manipulated. The attack relies on the HTTP/1.1 behavior, that headers can be defined as hop-by-hop via the HTTP Connection header. This issue has been addressed in release versions 2.11.9 and 3.1.3. Users are advised to upgrade. There are no known workarounds for this vulnerability.

## Affected packages

- Go `github.com/traefik/traefik/v3` >= 3.0.0-beta3, < 3.1.3 → fixed: 3.1.3
- Go `github.com/traefik/traefik/v2` < 2.11.9 → fixed: 2.11.9
- Go `github.com/traefik/traefik` < 2.11.9 → fixed: 2.11.9

## Affected products (CVE record)

- traefik traefik: < 2.11.9, >= 3.0.0, < 3.1.3

## Severity

- GitHub_M CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.51% probability of exploitation activity in the next 30 days; percentile 74.

## Sources

- [GitHub Advisory GHSA-62c8-mh53-4cqv](https://github.com/advisories/GHSA-62c8-mh53-4cqv)
- [CVE.org record CVE-2024-45410](https://www.cve.org/CVERecord?id=CVE-2024-45410)
- [NVD entry CVE-2024-45410](https://nvd.nist.gov/vuln/detail/CVE-2024-45410)
- [github.com](https://github.com/traefik/traefik/security/advisories/GHSA-62c8-mh53-4cqv)
- [github.com](https://github.com/traefik/traefik/releases/tag/v2.11.9)
- [github.com](https://github.com/traefik/traefik/releases/tag/v3.1.3)
- [github.com](https://github.com/traefik/traefik/commit/584144100524277829f26219baaab29a53b8134f)

---
Source page: https://erroneo.us/security/cve/CVE-2024-45410/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt