CVE-2023-27522

Apache HTTP Server: mod_proxy_uwsgi HTTP response splitting

HTTP Response Smuggling vulnerability in Apache HTTP Server via mod_proxy_uwsgi. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.55. Special characters in the origin response header can truncate/split the response forwarded to the client.

We have discovered 470,820 live websites that are affected by CVE-2023-27522.

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Affected Software

Product  Apache
Category Web Servers
Vulnerable Domains470,820 live websites (18% of Apache install base)
Vulnerable Versions
  • from 2.4.30 through 2.4.55
Vulnerable Versions Count21 versions ( 18% of all versions)


Common Weakness Enumeration

CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')



Details

  • Published - Mar 7, 2023
  • Updated - Feb 13, 2025

Credits

  • Dimas Fariski Setyawan Putra (nyxsorcerer) (finder)

Website Distribution by Country

Number of websites using CVE-2023-27522
United States139,448 websites


Germany55,517 websites
France24,709 websites
Japan21,887 websites
Italy18,848 websites
GB17,533 websites
Poland17,460 websites
Russia17,120 websites
Netherlands12,188 websites
Canada11,963 websites

Website Distribution by TLD

Number of websites using CVE-2023-27522
.com162,588 websites
.de29,755 websites
.org23,516 websites
.net18,256 websites
.it17,160 websites
.ru15,633 websites
.pl15,516 websites
.jp13,282 websites
.co.uk9,925 websites
.nl9,925 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2023-27522

Top websites that are affected by CVE-2023-27522. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
*******.com Singapore***
*************.***.****.****.************.net United States***
***.*********.com Singapore*,***
*****.*******.com Singapore*,***
****.*********.net GB*,***
******.*****.gov United States*,***
*************.com France*,***
*******.*******.pl Poland*,***
******.org United States*,***
***.**.uk GB*,***
See full domain list

FAQ

CVE-2023-27522 is Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in Apache
A total of 470,820 websites have been identified as vulnerable to CVE-2023-27522, based on global website indexing conducted by WebTechSurvey.
The Apache is affected by the CVE-2023-27522 vulnerability.
Apache versions up to and including 2.4.55 are vulnerable to CVE-2023-27522.