Is CVE-2025-46821 in the CISA KEV catalog?

No. CVE-2025-46821 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-46821?

CVE-2025-46821 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2025-46821?

CVE-2025-46821 has an EPSS score of 0.22% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-46821?

Upgrade envoy to 1.33.3 or later.

CVE & CISA-KEV Catalog

CVE-2025-46821

MEDIUM

5.3

CVSS v3

NVD

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.

CWE-186

How to fix

Remediation Available

envoyNVD

Affected:>= 1.33.0, < 1.33.3Fixed in:1.33.3CVE-2025-46821derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploit Intelligence

0.22%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Vendor Advisory1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-09-03.