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Vulnerability DatabaseCVE-2021-37147

CVE-2021-37147: 
Apache Traffic Server vulnerability analysis and mitigation

Overview

Improper input validation vulnerability in header parsing of Apache Traffic Server (CVE-2021-37147) allows an attacker to smuggle requests. This vulnerability affects Apache Traffic Server versions 8.0.0 to 8.1.2 and 9.0.0 to 9.1.0 (NVD, CVE).

Technical details

The vulnerability is classified as CWE-444 (Inconsistent Interpretation of HTTP Requests) and CWE-20 (Improper Input Validation). It received 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, indicating network accessibility, low attack complexity, no privileges required, and high impact on integrity (NVD).

Impact

The vulnerability primarily affects the integrity of the system, allowing potential request smuggling attacks. The CVSS scoring indicates no impact on confidentiality or availability, but a high impact on integrity, suggesting that attackers could potentially manipulate or inject malicious requests (NVD).

Mitigation and workarounds

The vulnerability has been addressed in subsequent releases. Debian has released security updates to fix 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
  • trafficserver-debugsource
NoYesJun 19, 2025
CVE-2025-31698HIGH7.5
  • Apache Traffic ServerApache Traffic Server
  • cpe:2.3:a:apache:traffic_server
NoYesJun 19, 2025
CVE-2024-53868HIGH7.5
  • Apache Traffic ServerApache Traffic Server
  • trafficserver-devel
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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