# CVE-2019-20894: GO-2022-0774 - Improper Authentication in github.com/containous/traefik

Source: https://junglewise.ai/threats/cve-2019-20894-improper-authentication  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-08-21  
License: CC BY 4.0 with a link back

CVE-2019-20894 · Severity: low · CVSS 3.1 · Published 2024-08-21

Improper Authentication in github.com/containous/traefik

Technologies: [github.com/containous/traefik (Go)](https://junglewise.ai/threats/technologies/github-com-containous-traefik), [github.com/containous/traefik/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-containous-traefik-v2), [github.com/traefik/traefik/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-traefik-traefik-v2). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2019-20894 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2019-20894 being exploited in the wild.

**How severe is CVE-2019-20894?** Low severity, with a CVSS score of 3.1, published 21 August 2024.

**Which products and versions are affected?** github.com/containous/traefik (Go) SEMVER:introduced=0; github.com/containous/traefik/v2 (Go) SEMVER:introduced=0,fixed=2.2.2; github.com/traefik/traefik/v2 (Go) SEMVER:introduced=0,fixed=2.2.2.

**Is there a fix for CVE-2019-20894?** Yes. github.com/containous/traefik/v2 (Go): upgrade to 2.2.2 or later; github.com/traefik/traefik/v2 (Go): upgrade to 2.2.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2019-20894?** Check whether you run github.com/containous/traefik (Go), github.com/containous/traefik/v2 (Go) or github.com/traefik/traefik/v2 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/containous/traefik/v2 (Go): upgrade to 2.2.2 or later

  ```sh
  go get github.com/containous/traefik/v2@v2.2.2
  ```

- github.com/traefik/traefik/v2 (Go): upgrade to 2.2.2 or later

  ```sh
  go get github.com/traefik/traefik/v2@v2.2.2
  ```


## Affected products

- github.com/containous/traefik (Go) SEMVER:introduced=0
- github.com/containous/traefik/v2 (Go) SEMVER:introduced=0,fixed=2.2.2
- github.com/traefik/traefik/v2 (Go) SEMVER:introduced=0,fixed=2.2.2

## Identifiers

- CVE-2019-20894
- GHSA-q9mp-79cp-9g8j
- GO-2022-0774

## Related threats

- [Traefik readTimeout not enforced on HTTP/3 connections](https://junglewise.ai/threats/cve-2026-88012-traefik-readtimeout-not-enforced-on-http-3-connections)
- [Traefik ForwardAuth identity spoofing via header alias](https://junglewise.ai/threats/cve-2026-88011-traefik-forwardauth-identity-spoofing-via-header-alias)
- [Traefik rootless HTTP/1 request-target routing bypass](https://junglewise.ai/threats/cve-2026-88009-traefik-rootless-http-1-request-target-routing-bypass)
- [Traefik HTTP request smuggling via unrestricted protocol upgrade](https://junglewise.ai/threats/cve-2026-88008-traefik-http-request-smuggling-via-unrestricted-protocol-upgrade)
- [Traefik HTTP/3 backend NTLM connection reuse](https://junglewise.ai/threats/cve-2026-88007-traefik-http-3-backend-ntlm-connection-reuse)