CVE-2021-44040— HTTP request line fuzzing attacks
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I. Basic Information for CVE-2021-44040
Vulnerability Information
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Vulnerability Title
HTTP request line fuzzing attacks
Source: NVD (National Vulnerability Database)
Vulnerability Description
Improper Input Validation vulnerability in request line parsing of Apache Traffic Server allows an attacker to send invalid requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.3 and 9.0.0 to 9.1.1.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
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 8.0.0 到 8.1.3 版本 和 9.0.0 到 9.1.1版本存在安全漏洞，该漏洞源于请求解析中的不正确的输入验证。攻击者可以发送无效请求利用该漏洞。
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 | 8.0.0 to 8.1.3 and 9.0.0 to 9.1.1 | - |
II. Public POCs for CVE-2021-44040
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://lists.apache.org/thread/zblwzcfs9ryhwjr89wz4osw55pxm6dx6x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-44040
IV. Related Vulnerabilities
Same product: Apache Traffic Server
- CVE-2025-65114
Apache Traffic Server: Malformed chunked message body allows - CVE-2025-58136
Apache Traffic Server: A simple legitimate POST request caus - CVE-2025-31698
Apache Traffic Server: Client IP address from PROXY protocol - CVE-2025-49763
Apache Traffic Server: Remote DoS via memory exhaustion in E - CVE-2024-53868
Apache Traffic Server: Malformed chunked message body allows
Same vendor: Apache Software Foundation
- CVE-2026-39816
Apache NiFi: Missing Execute Code Required Permission on Tin - CVE-2026-25199
Apache CloudStack: Proxmox Extension Allows Unauthorized Cro - CVE-2026-25077
Apache CloudStack: Unauthenticated Command Injection in Dire - CVE-2025-69233
Apache CloudStack: Domain/account resources limits not honor - CVE-2025-66467
Apache CloudStack: MinIO policy remains intact on bucket del
Same weakness: CWE-20
V. Comments for CVE-2021-44040
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