Vulnerability in Traefik
CVE-2021-32813
Traefik is an HTTP reverse proxy and load balancer. Prior to version 2.4.13, there exists a potential header vulnerability in Traefik's handling of the Connection header. Active exploitation of this issue is unlikely, as it requires that a removed header would lead to a privilege escalation, however, the Traefik team has addressed this issue to prevent any potential abuse. If one has a chain of Traefik middlewares, and one of them sets a request header, then sending a request with a certain Connection header will cause it to be removed before the request is sent. In this case, the backend does not see the request header. A patch is available in version 2.4.13. There are no known workarounds aside from upgrading.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.011 (64.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Traefik — versions < 2.4.13, <= 1.7.30
Weakness classification (CWE)
References
- github.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg (Third Party Advisory)
- github.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d… (Patch, Third Party Advisory)
- github.com/traefik/traefik/releases/tag/v2.4.13 (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-32813?
- CVE-2021-32813 is a medium-severity vulnerability in Traefik, classified under Improper Control of Dynamically-Managed Code Resources. CVSS score: 4.8/10. Published 2021-08-03.
- How severe is CVE-2021-32813?
- Medium severity. CVSS v3 base score is 4.8 out of 10.