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Vulnerability DatabaseCVE-2021-44040

CVE-2021-44040: 
Apache Traffic Server vulnerability analysis and mitigation

Overview

CVE-2021-44040 is an Improper Input Validation vulnerability discovered in the request line parsing functionality of Apache Traffic Server. The vulnerability affects Apache Traffic Server versions from 8.0.0 to 8.1.3 and 9.0.0 to 9.1.1. The issue was disclosed and assigned a CVE ID on November 19, 2021 (NVD).

Technical details

The vulnerability has been assigned a CVSS v3.1 base score of 7.5 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N. The vulnerability is classified under CWE-20 (Improper Input Validation) and allows attackers to send invalid requests to the server (NVD).

Impact

The vulnerability allows attackers to send invalid requests to the server, potentially leading to HTTP request smuggling attacks. The CVSS scoring indicates that while there is no impact on confidentiality or availability, there is a high impact on integrity of the system (NVD).

Mitigation and workarounds

The vulnerability has been fixed in multiple versions across different distributions. Debian has released security updates addressing this issue in version 8.0.2+ds-1+deb10u6 for oldstable (buster) and version 8.1.1+ds-1.1+deb11u1 for stable (bullseye) distributions (Debian Advisory).

Additional resources

Source: This report was generated using AI

Related Apache Traffic Server vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2025-49763HIGH7.5
  • Apache Traffic ServerApache Traffic Server
  • cpe:2.3:a:apache:traffic_server
NoYesJun 19, 2025
CVE-2025-31698HIGH7.5
  • Apache Traffic ServerApache Traffic Server
  • trafficserver-debugsource
NoYesJun 19, 2025
CVE-2024-53868HIGH7.5
  • Apache Traffic ServerApache Traffic Server
  • trafficserver
NoYesApr 03, 2025
CVE-2024-56196MEDIUM6.3
  • Apache Traffic ServerApache Traffic Server
  • cpe:2.3:a:apache:traffic_server
NoYesMar 06, 2025
CVE-2024-56195MEDIUM6.3
  • Apache Traffic ServerApache Traffic Server
  • trafficserver
NoYesMar 06, 2025

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