CVE-2025-25294 | Envoy Gateway Log Injection Vulnerability

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: 2025-03-06 Last update: 2025-09-04 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-25294 is rated Low Risk (39/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.27%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-25294

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-09 0.36% 0.27% -0.08%
2 2026-04-15 0.25% 0.36% +0.10%
3 2025-11-30 — 0.25% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-25294

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]

Weakness enumeration for CVE-2025-25294

GitHub Security Advisory for CVE-2025-25294

GHSA-mf24-chxh-hmvj · Severity: medium · Ecosystem: go — Envoy Gateway Log Injection Vulnerability

OS Trackers for CVE-2025-25294

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2025-25294

Affected software / configurations for CVE-2025-25294

Vendor Product Version Raw CPE
envoyproxy gateway < 1.2.7 cpe:2.3:a:envoyproxy:gateway:*:*:*:*:*:*:*:*
envoyproxy gateway >= 1.3.0, < 1.3.1 cpe:2.3:a:envoyproxy:gateway:*:*:*:*:*:*:*:*

References for CVE-2025-25294

cvelogic Threat Intelligence