CVE-2025-46821: Envoy vulnerable to bypass of RBAC uri_template permission
First published: Wed May 07 2025(Updated: )
Envoy is a cloud-native edge/middle/service proxy. Prior to versions 1.34.1, 1.33.3, 1.32.6, and 1.31.8, Envoy's URI template matcher incorrectly excludes the `*` character from a set of valid characters in the URI path. As a result URI path containing the `*` character will not match a URI template expressions. This can result in bypass of RBAC rules when configured using the `uri_template` permissions. This vulnerability is fixed in Envoy versions v1.34.1, v1.33.3, v1.32.6, v1.31.8. As a workaround, configure additional RBAC permissions using `url_path` with `safe_regex` expression.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Envoy Proxy | <1.31.8 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Frequently Asked Questions
What is the severity of CVE-2025-46821?
CVE-2025-46821 has a severity rating of medium due to the potential impact on URI path matching in Envoy.
How do I fix CVE-2025-46821?
To fix CVE-2025-46821, upgrade Envoy to versions 1.34.1, 1.33.3, 1.32.6, or 1.31.8 or later.
What versions of Envoy are affected by CVE-2025-46821?
CVE-2025-46821 affects Envoy versions prior to 1.34.1, 1.33.3, 1.32.6, and 1.31.8.
What types of applications are vulnerable to CVE-2025-46821?
Applications using Envoy as a proxy before the patched versions are vulnerable to CVE-2025-46821.
What are the implications of CVE-2025-46821 for my deployment?
CVE-2025-46821 can lead to unexpected behavior in routing requests with `*` in the URI path, potentially affecting application functionality.
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/type
- agent/title
- agent/weakness
- agent/first-publish-date
- agent/description
- agent/guess-ai
- agent/software-canonical-lookup
- agent/softwarecombine
- collector/nvd-api
- source/NVD
- agent/last-modified-date
- agent/severity
- agent/author
- agent/event
- collector/epss-latest
- source/FIRST
- agent/source
- agent/tags
- agent/epss
- vendor/envoy
- canonical/envoy proxy