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CVE-2021-32780— Incorrect handling of H/2 GOAWAY followed by SETTINGS frames

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 功能存在代码问题漏洞，该漏洞源于在同一 I/O 事件中从 CLOSED 到 DRAINING 的状态转换无效。

CVSS 8.6 · High EPSS 1.23% · P68

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-32780

Vulnerability Information
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Vulnerability Title
Incorrect handling of H/2 GOAWAY followed by SETTINGS frames
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions Envoy transitions a H/2 connection to the CLOSED state when it receives a GOAWAY frame without any streams outstanding. The connection state is transitioned to DRAINING when it receives a SETTING frame with the SETTINGS_MAX_CONCURRENT_STREAMS parameter set to 0. Receiving these two frames in the same I/O event results in abnormal termination of the Envoy process due to invalid state transition from CLOSED to DRAINING. A sequence of H/2 frames delivered by an untrusted upstream server will result in Denial of Service in the presence of untrusted **upstream** servers. Envoy versions 1.19.1, 1.18.4 contain fixes to stop processing of pending H/2 frames after connection transition to the CLOSED state.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy 功能存在代码问题漏洞，该漏洞源于在同一 I/O 事件中从 CLOSED 到 DRAINING 的状态转换无效。
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 >= 1.19.0, < 1.19.1 -

II. Public POCs for CVE-2021-32780

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III. Intelligence Information for CVE-2021-32780

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Vendor Advisories for CVE-2021-32780 (1)

Other References for CVE-2021-32780 (1)

Same Patch Batch · envoyproxy · 2021-08-24 · 5 CVEs total

CVE-2021-32777 8.6 HIGH Incorrect concatenation of multiple value request headers in ext-authz extension
CVE-2021-32779 8.6 HIGH Incorrectly handling of URI '#fragment' element as part of the path element
CVE-2021-32781 8.6 HIGH Continued processing of requests after locally generated response
CVE-2021-32778 5.8 MEDIUM Excessive CPU utilization when closing HTTP/2 streams

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-754

V. Comments for CVE-2021-32780

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