CVE-2025-25294: Envoy Gateway Log Injection Vulnerability

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-03-06 · updated 2026-06-17
Weakness: CWE-117

Description

Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway. In all Envoy Gateway versions prior to 1.2.7 and 1.3.1 a default Envoy Proxy access log configuration is used. This format is vulnerable to log injection attacks. If the attacker uses a specially crafted user-agent which performs json injection, then he could add and overwrite fields to the access log. This vulnerability is fixed in 1.3.1 and 1.2.7. One can overwrite the old text based default format with JSON formatter by modifying the "EnvoyProxy.spec.telemetry.accessLog" setting.

Affected products

envoyproxy gateway: before 1.2.7; from 1.3.0 before 1.3.1 — fixed in 1.2.7, 1.3.1

How to fix

Upgrade to a fixed version: envoyproxy gateway 1.2.7, 1.3.1. Check the vendor advisory for mitigations.

References

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