STIGQter: STIG Summary: Mozilla Firefox Security Technical Implementation Guide Version: 6 Release: 8 Benchmark Date: 01 Jul 2026:

Firefox must be configured to allow only TLS 1.2 or above.

DISA Rule

SV-251546r1201983_rule

Vulnerability Number

V-251546

Group Title

SRG-APP-000560

Rule Version

FFOX-00-000002

Severity

CAT I

CCI(s)

CCI-001453 - Implement cryptographic mechanisms to protect the integrity of remote access sessions.

Weight

Fix Recommendation

Windows group policy:
1. Open the group policy editor tool with "gpedit.msc".
2. Navigate to Policy Path: Computer Configuration\Administrative Templates\Mozilla\Firefox\
Policy Name: Minimum SSL version enabled
Policy State: Enabled
Policy Value: TLS 1.2 (or TLS 1.3)

macOS "plist" file:
Add the following:
<key>SSLVersionMin</key>
<string>tls1.2</string> (or <string>tls1.3</string>)

Linux "policies.json" file:
Add the following in the policies section:
"SSLVersionMin": "tls1.2" or ("SSLVersionMin": "tls1.3")

Check Contents

Type "about:policies" in the browser window.

If "SSLVersionMin" is not displayed under Policy Name or the Policy Value is not "tls1.2" or "tls1.3", this is a finding.

Vulnerability Number

V-251546

Documentable

False

Rule Version

FFOX-00-000002

Severity Override Guidance

Type "about:policies" in the browser window.

If "SSLVersionMin" is not displayed under Policy Name or the Policy Value is not "tls1.2" or "tls1.3", this is a finding.

Check Content Reference

Target Key

5446