The remote Oracle Linux 6 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2020-1488 advisory.

  - Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We     are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird <     68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1. (CVE-2020-6820)

  - When reading from areas partially or fully outside the source resource with WebGL's     <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously,     this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability     affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75. (CVE-2020-6821)

  - Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-     free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects     Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1. (CVE-2020-6819)

  - On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in     <code>GMPDecodeData</code>. It is possible that with enough effort this could have been exploited to run     arbitrary code. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.
    (CVE-2020-6822)

  - Mozilla developers and community members Tyson Smith and Christian Holler reported memory safety bugs     present in Firefox 74 and Firefox ESR 68.6. Some of these bugs showed evidence of memory corruption and we     presume that with enough effort some of these could have been exploited to run arbitrary code. This     vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75. (CVE-2020-6825)

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

The version of Firefox ESR installed on the remote host is prior to 68.6.1. It is affected by a race condition when handling a ReadableStream or running the nsDocShell destructor that can cause a use-after-free. There are known targeted attacks in the wild abusing this flaw. 

The version of Firefox installed on the remote host is prior to 74.0.1. It is affected by a race condition when handling a ReadableStream or running the nsDocShell destructor that can cause a use-after-free. There are known targeted attacks in the wild abusing this flaw. 

ID	Name	Product	Family	Published	Updated	Severity
180923	Oracle Linux 6 : thunderbird (ELSA-2020-1488)	Nessus	Oracle Linux Local Security Checks	9/7/2023	9/8/2023	critical
147407	NewStart CGSL MAIN 4.06 : firefox Multiple Vulnerabilities (NS-SA-2021-0004)	Nessus	NewStart CGSL Local Security Checks	3/10/2021	4/25/2023	critical
701273	Mozilla Firefox ESR < 68.6.1 Race Condition	Nessus Network Monitor	Web Clients	4/24/2020	5/1/2020	high
701275	Mozilla Firefox < 74.0.1 Race Condition	Nessus Network Monitor	Web Clients	4/24/2020	5/1/2020	high

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critical

critical

high

high