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CVE-2021-32566— Specific sequence of HTTP/2 frames can cause ATS to crash

Quick assessment

Affected
Apache Software Foundation Apache Traffic Server
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.

Apache Traffic Server（ATS）是美国阿帕奇（Apache）基金会的一套可扩展的HTTP代理和缓存服务器。 Apache Traffic Server存在输入验证错误漏洞，该漏洞源于Apache Traffic Server的HTTP/2存在不当输入验证漏洞。攻击者可利用该漏洞对服务器进行DOS攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 2.51% · P84

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-32566

Vulnerability Information
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Vulnerability Title
Specific sequence of HTTP/2 frames can cause ATS to crash
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Input Validation vulnerability in HTTP/2 of Apache Traffic Server allows an attacker to DOS the server. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Traffic Server 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Traffic Server（ATS）是美国阿帕奇（Apache）基金会的一套可扩展的HTTP代理和缓存服务器。 Apache Traffic Server存在输入验证错误漏洞，该漏洞源于Apache Traffic Server的HTTP/2存在不当输入验证漏洞。攻击者可利用该漏洞对服务器进行DOS攻击。
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
Apache Software Foundation Apache Traffic Server Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1 -

II. Public POCs for CVE-2021-32566

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III. Intelligence Information for CVE-2021-32566

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Vendor Advisories for CVE-2021-32566 (1)

Mailing List Discussions for CVE-2021-32566 (1)

Same Patch Batch · Apache Software Foundation · 2021-06-30 · 3 CVEs total

CVE-2021-35474 Dynamic stack buffer overflow in cachekey plugin
CVE-2021-32567 Reading HTTP/2 frames too many times

IV. Related Vulnerabilities

Same product: Apache Traffic Server
Same vendor: Apache Software Foundation
Same weakness: CWE-20

V. Comments for CVE-2021-32566

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