Vulnerability in Envoyproxy Gateway
CVE-2025-25294
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (18.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Envoyproxy Gateway — versions >= 1.3.0-rc.1, < 1.3.1, < 1.2.7
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/envoyproxy/gateway/security/advisories/GHSA-mf24-chxh-hmvj (Third Party Advisory, Mitigation)
- github.com/envoyproxy/gateway/commit/8f48f5199cf1bbb9a8ac0695c5171bfef6c9198a (Patch)
Frequently asked questions
- What is CVE-2025-25294?
- CVE-2025-25294 is a medium-severity vulnerability in Envoyproxy Gateway, classified under Improper Output Neutralization for Logs. CVSS score: 5.3/10. Published 2025-03-06.
- How severe is CVE-2025-25294?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2025-25294 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.