🚀 Acunetix is now Invicti Web + API. Read the announcement.
Get a demo Invicti Website Security Scanner Get a demo
  • Product
  • Why Invicti Web + API?
    • Solutions
      • INDUSTRIES
        • IT & Telecom
        • Government
        • Financial Services
        • Education
        • Healthcare
      • ROLES
        • CTO & CISO
        • Engineering Manager
        • Security Engineer
        • DevSecOps
    • Case Studies
    • Customers
    • Testimonials
  • Pricing
  • About Us
    • Our story
    • In the news
    • Careers
    • Contact
  • Resources
    • Blog
    • Webinars
    • White papers
    • Buyer’s guide
    • Partners
    • Documentation
  • Get a demo
WEB APPLICATION VULNERABILITIES Standard & Premium

Apache Traffic Server Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') Vulnerability (CVE-2021-27577)

Description

Incorrect handling of url fragment vulnerability of Apache Traffic Server allows an attacker to poison the cache. 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.

Remediation

References

CVE-2021-27577

Related Vulnerabilities

WordPress Plugin Startklar Elementor Addons Arbitrary File Deletion (1.7.13)

WordPress Plugin YOP Poll Cross-Site Scripting (6.0.2)

PHP Other Vulnerability (CVE-2005-3392)

Drupal Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2012-5652)

MySQL CVE-2019-2780 Vulnerability (CVE-2019-2780)

Severity

High

Classification

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Tags

Missing Update Known Vulnerabilities CWE-444 CVE-2021-27577

Take action and discover your vulnerabilities

Get a demo
Client: AWS
Client: Cognizant
Client: Garmin
Client: Airforce
Client: NASA
Client: American Express
Product Information
  • AcuSensor Technology
  • AcuMonitor Technology
  • Invicti Web + API Integrations
  • Vulnerability Scanner
  • Support Plans
Use Cases
  • Agentic Pentesting
  • Website Security Scanner
  • External Vulnerability Scanner
  • Web Application Security
  • Vulnerability Management Software
Website Security
  • Cross-site Scripting
  • SQL Injection
  • Reflected XSS
  • CSRF Attacks
  • Directory Traversal
Learn More
  • White Papers
  • TLS Security
  • WordPress Security
  • Web Service Security
  • Prevent SQL Injection
Company
  • About Us
  • Customers
  • Become a Partner
  • Careers
  • Contact
Documentation
  • Case Studies
  • Documentation
  • Videos
  • Vulnerability Index
  • Webinars
  • Login
  • Invicti Subscription Services Agreement
  • Privacy Policy
  • Terms of Use
  • Sitemap
  • Follow us on X
  • Follow us on LinkedIn

© Invicti Web + API 2026