Traefik
CVE-2021-27375
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V3 - Web Frontend Security Clickjacking prevention, X-Frame-Options
|
| Impact | CVSS score of 5.3 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. |
| Exploit ScenarioDerived | This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system. |
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Alert meAnalysisAI
Traefik before 2.4.5 allows the loading of IFRAME elements from other domains. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
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Technical ContextAI · show details
This vulnerability is classified under CWE-1021. Traefik before 2.4.5 allows the loading of IFRAME elements from other domains. Affected products include: Containous Traefik. Version information: before 2.4.5.
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
Traefik before 2.4.5 allows the loading of IFRAME elements from other domains.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)NVD
Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour
Authentication bypass in Traefik reverse proxy before v2.11.55 lets remote unauthenticated attackers defeat any route pr
Backend connection hijacking in Traefik reverse proxy (2.11.0 through 2.11.56 and 3.0.0 through 3.7.12) lets an unauthen
HTTP/1 request-target parsing in Traefik prior to 2.11.57 and 3.7.13 allows unauthenticated remote attackers to send a r
Authentication bypass in the Traefik reverse proxy (v2.11.51 and earlier, v3.6.0-v3.6.22, and v3.7.0-v3.7.6) allows unau
Route-level authentication bypass in Traefik v3.7.0-v3.7.7 allows unauthenticated remote attackers to reach backend endp
Traefik is an open source HTTP reverse proxy and load balancer. Rated high severity (CVSS 7.5), this vulnerability is re
types/types.go in Containous Traefik 1.7.x through 1.7.11, when the --api flag is used and the API is publicly reachable
Security middleware bypass in Traefik reverse proxy versions 2.11.26-2.11.56 and 3.4.2-3.7.12 allows unauthenticated net
Traefik's header-security defenses (aliasHeadersStrategy, underscoreHeadersStrategy, forwardedHeaders) inspect req.Heade
Path normalization bypass in Traefik allows unauthenticated remote attackers to circumvent the middleware chain on path-
Traefik is an open source HTTP reverse proxy and load balancer. Rated medium severity (CVSS 6.5), this vulnerability is
Exploit-DB