Vulnerability · Published May 7, 2025 · Assigned by GitHub_M

CVE-2025-46821Envoy vulnerable to bypass of RBAC uri_template permission

Medium 5.3

In plain English

A medium-severity security flaw in envoy from envoyproxy. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 80.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
envoyproxy	envoy	< 1.31.8>= 1.32.0, < 1.32.6>= 1.33.0, < 1.33.3>= 1.34.0, < 1.34.1

Weakness: CWE-186 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-c7cm-838g-6g67 x_refsource_CONFIRM