VDB-243239 · CVE-2023-5728 · Bug 1852729

Mozilla Thunderbird up to 115.3.1 Javascript Engine denial of service

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.4	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in Mozilla Thunderbird up to 115.3.1 and classified as problematic. The impacted element is an unknown function of the component Javascript Engine. The manipulation leads to denial of service. This vulnerability is traded as CVE-2023-5728. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Mozilla Thunderbird up to 115.3.1 (Mail Client Software) and classified as problematic. This issue affects an unknown part of the component Javascript Engine. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability.

The weakness was shared 10/24/2023 by anbu as Bug 1852729 as confirmed advisory (Website). It is possible to read the advisory at bugzilla.mozilla.org. The advisory contains:

During garbage collection extra operations were performed on a object that should not be. This could have led to a potentially exploitable crash.

The identification of this vulnerability is CVE-2023-5728. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 276142 (TencentOS Server 3: firefox (TSSA-2023:0261)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 115.4 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (276142). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Mail Client Software

Vendor

Mozilla

Name

Thunderbird

Version

License

open-source

Website

Vendor: https://www.mozilla.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

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

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 7.5
CNA Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 276142
Nessus Name: TencentOS Server 3: firefox (TSSA-2023:0261)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Thunderbird 115.4

Timelineinfo

10/23/2023 🔍
10/24/2023 +1 days 🔍
10/24/2023 +0 days 🔍
10/24/2023 +0 days 🔍
11/24/2025 +762 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: Bug 1852729
Researcher: anbu
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2023-5728 (🔍)
GCVE (CVE): GCVE-0-2023-5728
GCVE (VulDB): GCVE-100-243239

Entryinfo

Created: 10/24/2023 21:22
Updated: 11/24/2025 09:53
Changes: 10/24/2023 21:22 (18), 10/24/2023 21:25 (28), 11/15/2023 14:02 (2), 09/12/2024 00:04 (36), 04/21/2025 08:29 (3), 11/24/2025 09:53 (2)
Complete: 🔍
Cache ID: 216::103