Mozilla Firefox up to 85.x Referer Policy information disclosure

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CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

A vulnerability classified as problematic has been found in Mozilla Firefox up to 85.x (Web Browser). Affected is an unknown part of the component Referer Policy Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. This is going to have an impact on confidentiality. CVE summarizes:

When processing a redirect with a conflicting Referrer-Policy, Firefox would have adopted the redirect's Referrer-Policy. This would have potentially resulted in more information than intended by the original origin being provided to the destination of the redirect. This vulnerability affects Firefox < 86.

The weakness was published 02/26/2021. The advisory is shared for download at bugzilla.mozilla.org. This vulnerability is traded as CVE-2021-23971 since 01/13/2021. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 03/05/2021).

Upgrading to version 86.0 eliminates this vulnerability. The upgrade is hosted for download at mozilla.org.

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VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔒

CVSSv2infoedit

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

NVD Base Score: 🔒

Exploitinginfoedit

Class: Information disclosure
CWE: CWE-200
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
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Remediation: 🔍

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Firefox 86.0

Timelineinfoedit

01/13/2021 CVE assigned
02/26/2021 +44 days Advisory disclosed
02/26/2021 +0 days VulDB entry created
03/05/2021 +7 days VulDB last update

Sourcesinfoedit

Vendor: https://www.mozilla.org/
Product: https://www.mozilla.org/en-US/firefox/

Advisory: bugzilla.mozilla.org
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2021-23971 (🔒)

Entryinfoedit

Created: 02/26/2021 10:05 AM
Updated: 03/05/2021 02:39 PM
Changes: (18) vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_meta_basescore vulnerability_cvss3_meta_tempscore vulnerability_cvss2_nvd_basescore vulnerability_cvss3_nvd_basescore
Complete: 🔍

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