Apache Traffic Server

Category - Web Servers, Reverse Proxy

The Apache Traffic Server (ATS) is a high-performance reverse proxy and forward proxy server. Formerly a commercial product, Yahoo! donated ATS to the Apache Foundation, and it is currently used by several major CDNs and content owners.


We have discovered  46,239 live websites   are using ATS.

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Technology usage statistics

Websites using ATS:46,239 websites
Most popular in: United States
Market position in Web Servers category:#23
Market share in Web Servers:less than 0.1%
Most popular version:6.2.1

Security vulnerabilites

Top 10 most common security vulnerabilities associated with ATS
PublishedCVETitleDomains
Aug, 2023CVE-2023-33934Apache Traffic Server: Differential fuzzing for HTTP request parsing discrepancies733
Aug, 2023CVE-2022-47185Apache Traffic Server: Invalid Range header causes a crash733
May, 2021CVE-2021-27737Apache Traffic Server 9.0.0 is vulnerable to a remote DOS attack on the experimental Slicer plugin.704
Apr, 2017CVE-2017-5659Apache Traffic Server before 6.2.1 generates a coredump when there is a mismatch between content len...631
Apr, 2026CVE-2025-58136Apache Traffic Server: A simple legitimate POST request causes a crash421
Apr, 2026CVE-2025-65114Apache Traffic Server: Malformed chunked message body allows request smuggling421
Mar, 2025CVE-2024-38311Apache Traffic Server: Request smuggling via pipelining after a chunked message body400
Jun, 2025CVE-2025-49763Apache Traffic Server: Remote DoS via memory exhaustion in ESI Plugin378
Jun, 2025CVE-2025-31698Apache Traffic Server: Client IP address from PROXY protocol is not used for ACL378
Apr, 2025CVE-2024-53868Apache Traffic Server: Malformed chunked message body allows request smuggling350

Technology adoption

Recent changes in ATS usage.
Websites that added ATS 2,588
Websites that dropped ATS 1,107
Websites that changed version of ATS  38

Available Reports


Alternative Names

  • ATS

Technology Information


Major Versions

  • 10.xx (7 subversions, 195 domains)
  • 9.xx (6 subversions, 227 domains)
  • 8.xx (5 subversions, 50 domains)
  • 7.xx (3 subversions, 14 domains)
  • 6.xx (3 subversions, 567 domains)
  • 5.xx (3 subversions, 64 domains)

Website Distribution by Country

Number of websites using ATS
United States21,286 websites


Czech Republic20,509 websites
Japan1,807 websites
China877 websites
Slovakia322 websites
GB268 websites
Germany238 websites
Canada109 websites
Vietnam78 websites

Website Distribution by TLD

Number of websites using ATS
.com19,720 websites
.cz17,375 websites
.org1,696 websites
.net1,479 websites
.eu964 websites
.jp703 websites
.sk553 websites
.com.cn501 websites
.co.jp287 websites
.de229 websites

Apache Traffic Server Versions

sorted by popularity
6.2.1559 websites
9.2.3132 websites
10.0.3128 websites
5.0.156 websites
9.2.246 websites
10.137 websites
9.1.126 websites
8.1.1122 websites
9.2.917 websites
8.0.514 websites

See all Apache Traffic Server versions ...

Top Websites Using Apache Traffic Server

A look at the most popular websites built with ATS
DomainCountryRankContacts
en.wikipedia.org United States53
finance.yahoo.com United States102
tw.yahoo.com United States162
yahoo.com.tw United States210
yahoo.com United States416
s.yimg.com United States464
See full domain list

Always Used together



Alternative Technologies


Nginx: Total 14,448,290 domains found using Nginx
Apache: Total 14,320,495 domains found using Apache
Cloudflare Server: Total 7,694,427 domains found using Cloudflare Server
OpenResty: Total 3,666,356 domains found using OpenResty
LiteSpeed: Total 3,429,894 domains found using LiteSpeed
Pepyaka: Total 1,896,130 domains found using Pepyaka
IIS: Total 1,655,346 domains found using IIS
Caddy: Total 968,040 domains found using Caddy
Kestrel: Total 803,715 domains found using Kestrel
Tengine: Total 288,288 domains found using Tengine

FAQ

Apache Traffic Server falls under the categories of Web Servers, and Reverse Proxy.
WebTechSurvey systematically indexes websites and their technologies. Users can find websites using Apache Traffic Server through the WebTechSurvey platform.
There are currently 58,850,305 live websites that use Apache Traffic Server.
The main competitors to Apache Traffic Server include Nginx, Apache, Cloudflare Server, and OpenResty.
Apache Traffic Server has a known security vulnerabilities: CVE-2025-58136, CVE-2025-65114, CVE-2025-49763, and CVE-2025-31698.