STIGQter: STIG Summary: Web Server Security Requirements Guide Version: 4 Release: 5 Benchmark Date: 01 Jul 2026:

The web server must disable HTTP/1.x downgrading.

DISA Rule

SV-264363r984434_rule

Vulnerability Number

V-264363

Group Title

SRG-APP-000439

Rule Version

SRG-APP-000439-WSR-000193

Severity

CAT II

CCI(s)

• CCI-002418 - Protect the confidentiality and/or integrity of transmitted information.

Weight

10

Fix Recommendation

Configure the web server to disable HTTP/1.x downgrading.

If HTTP downgrading is operationally necessary, validate the rewritten request against the HTTP/1.1 specification, i.e., reject requests that contain new lines in the headers, colons in header names, and spaces in the request method.

Check Contents

If HTTP downgrading is operationally necessary, and the rewritten request is validated against HTTP/1.x specification (i.e., verify requests that contain new lines in the headers, colons in header names, and spaces in the request method are rejected), mark as a CAT III finding.

Verify that HTTP/1.x downgrading is disabled.

If the HTTP/1.x downgrading is enabled, this is a finding.

Vulnerability Number

V-264363

Documentable

False

Rule Version

SRG-APP-000439-WSR-000193

Severity Override Guidance

If HTTP downgrading is operationally necessary, and the rewritten request is validated against HTTP/1.x specification (i.e., verify requests that contain new lines in the headers, colons in header names, and spaces in the request method are rejected), mark as a CAT III finding.

Verify that HTTP/1.x downgrading is disabled.

If the HTTP/1.x downgrading is enabled, this is a finding.

Check Content Reference

M

Target Key

2910