Mozilla Firefox ESR < 78.10

high Nessus Plugin ID 148775

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Synopsis

A web browser installed on the remote Windows host is affected by multiple vulnerabilities.

Description

The version of Firefox ESR installed on the remote Windows host is prior to 78.10. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-15 advisory.

- Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed port blocking restrictions when used in the Alt-Svc header. (CVE-2021-29946)

- A WebGL framebuffer was not initialized early enough, resulting in memory corruption and an out of bound write. (CVE-2021-23994)

- When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. (CVE-2021-23995)

- Through complicated navigations with new windows, an HTTP page could have inherited a secure lock icon from an HTTPS page. (CVE-2021-23998)

- Further techniques that built on the slipstream research combined with a malicious webpage could have exposed both an internal network's hosts as well as services running on the user's local machine.
(CVE-2021-23961)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Mozilla Firefox ESR version 78.10 or later.

Plugin Details

Severity: High

ID: 148775

File Name: mozilla_firefox_78_10_esr.nasl

Version: 1.8

Type: local

Agent: windows

Family: Windows

Published: 4/19/2021

Updated: 11/18/2025

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2021-29946

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:mozilla:firefox_esr

Required KB Items: installed_sw/Mozilla Firefox ESR

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/19/2021

Vulnerability Publication Date: 1/26/2021

Reference Information

CVE: CVE-2021-23961, CVE-2021-23994, CVE-2021-23995, CVE-2021-23998, CVE-2021-23999, CVE-2021-24002, CVE-2021-29945, CVE-2021-29946

IAVA: 2021-A-0185-S

Detections

Analytics