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CVE-2021-32778— Excessive CPU utilization when closing HTTP/2 streams

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.

洪湖尔创网联信息技术 EARCLINK ESPCMS是中国洪湖尔创网联信息技术公司的一套企业建站系统。 EARCLINK ESPCMS-P8的espcms_web/Search.php组件存在SQL注入漏洞，攻击者可利用该漏洞访问敏感的数据库信息。

CVSS 5.8 · Medium EPSS 1.23% · P68
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I. Basic Information for CVE-2021-32778

Vulnerability Information
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Vulnerability Title
Excessive CPU utilization when closing HTTP/2 streams
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’s procedure for resetting a HTTP/2 stream has O(N^2) complexity, leading to high CPU utilization when a large number of streams are reset. Deployments are susceptible to Denial of Service when Envoy is configured with high limit on H/2 concurrent streams. An attacker wishing to exploit this vulnerability would require a client opening and closing a large number of H/2 streams. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to reduce time complexity of resetting HTTP/2 streams. As a workaround users may limit the number of simultaneous HTTP/2 dreams for upstream and downstream peers to a low number, i.e. 100.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
过度迭代
Source: CVE Program / CVE List V5
Vulnerability Title
EARCLINK ESPCMS SQL注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
洪湖尔创网联信息技术 EARCLINK ESPCMS是中国洪湖尔创网联信息技术公司的一套企业建站系统。 EARCLINK ESPCMS-P8的espcms_web/Search.php组件存在SQL注入漏洞，攻击者可利用该漏洞访问敏感的数据库信息。
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-2021-32778

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III. Intelligence Information for CVE-2021-32778

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Vendor Advisories for CVE-2021-32778 (1)

Other References for CVE-2021-32778 (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-2021-32780 8.6 HIGH Incorrect handling of H/2 GOAWAY followed by SETTINGS frames
CVE-2021-32781 8.6 HIGH Continued processing of requests after locally generated response

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-834

V. Comments for CVE-2021-32778

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