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CVE-2023-35945— Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec

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是一款开源的分布式代理服务器。 Envoy 1.27.0之前版本存在资源管理错误漏洞，该漏洞源于Envoy 的 HTTP/2 编解码器在收到来自上游服务器的帧RST_STREAM后，可能会泄漏header map和bookkeeping structures。

CVSS 7.5 · High EPSS 1.29% · P69

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-35945

Vulnerability Information
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Vulnerability Title
Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is a cloud-native high-performance edge/middle/service proxy. Envoy’s HTTP/2 codec may leak a header map and bookkeeping structures upon receiving `RST_STREAM` immediately followed by the `GOAWAY` frames from an upstream server. In nghttp2, cleanup of pending requests due to receipt of the `GOAWAY` frame skips de-allocation of the bookkeeping structure and pending compressed header. The error return [code path] is taken if connection is already marked for not sending more requests due to `GOAWAY` frame. The clean-up code is right after the return statement, causing memory leak. Denial of service through memory exhaustion. This vulnerability was patched in versions(s) 1.26.3, 1.25.8, 1.24.9, 1.23.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy 1.27.0之前版本存在资源管理错误漏洞，该漏洞源于Envoy 的 HTTP/2 编解码器在收到来自上游服务器的帧RST_STREAM后，可能会泄漏header map和bookkeeping structures。
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 >= 1.26.0, < 1.26.3 -

II. Public POCs for CVE-2023-35945

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III. Intelligence Information for CVE-2023-35945

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Vendor Advisories for CVE-2023-35945 (1)

Other References for CVE-2023-35945 (1)

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-400

V. Comments for CVE-2023-35945

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