CVE-2025-62409— Envoy allows large requests and responses to cause TCP connection pool crash
Quick assessment
Affected
envoyproxy envoy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Envoy是Enphase开源的一款用于连接智能家居设备的网关程序。 Envoy 1.36.1之前版本、1.35.5之前版本、1.34.9之前版本和1.33.10之前版本存在安全漏洞，该漏洞源于流控制管理不当，可能导致TCP连接池崩溃。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-62409
Vulnerability Information
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Vulnerability Title
Envoy allows large requests and responses to cause TCP connection pool crash
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is a cloud-native, open source edge and service proxy. Prior to 1.36.1, 1.35.5, 1.34.9, and 1.33.10, large requests and responses can potentially trigger TCP connection pool crashes due to flow control management in Envoy. It will happen when the connection is closing but upstream data is still coming, resulting in a buffer watermark callback nullptr reference. The vulnerability impacts TCP proxy and HTTP 1 & 2 mixed use cases based on ALPN. This vulnerability is fixed in 1.36.1, 1.35.5, 1.34.9, and 1.33.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是Enphase开源的一款用于连接智能家居设备的网关程序。 Envoy 1.36.1之前版本、1.35.5之前版本、1.34.9之前版本和1.33.10之前版本存在安全漏洞，该漏洞源于流控制管理不当，可能导致TCP连接池崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| envoyproxy | envoy | >= 1.36.0, < 1.36.1 | - |
|
II. Public POCs for CVE-2025-62409
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same vendor: envoyproxy
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Same weakness: CWE-476
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V. Comments for CVE-2025-62409
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