Mozilla Firefox/Firefox ESR up to 115.0.1 Worker use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.4$5k-$25k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Mozilla Firefox and Firefox ESR up to 115.0.1. This affects an unknown function of the component Worker. The manipulation leads to use after free. This vulnerability is traded as CVE-2023-3600. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Mozilla Firefox and Firefox ESR up to 115.0.1 (Web Browser) and classified as critical. This issue affects some unknown functionality of the component Worker. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

During the worker lifecycle, a use-after-free condition could have occurred, which could have led to a potentially exploitable crash. This vulnerability affects Firefox < 115.0.2, Firefox ESR < 115.0.2, and Thunderbird < 115.0.1.

The weakness was shared 07/12/2023. It is possible to read the advisory at mozilla.org. The identification of this vulnerability is CVE-2023-3600 since 07/10/2023. 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 pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 12/18/2025).

The vulnerability scanner Nessus provides a plugin with the ID 239741 (TencentOS Server 3: firefox (TSSA-2023:0238)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 115.0.2 eliminates this vulnerability. The upgrade is hosted for download at mozilla.org.

The vulnerability is also documented in the vulnerability database at Tenable (239741). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 239741
Nessus Name: TencentOS Server 3: firefox (TSSA-2023:0238)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Firefox/Firefox ESR 115.0.2

Timelineinfo

07/10/2023 🔍
07/12/2023 +2 days 🔍
07/12/2023 +0 days 🔍
12/18/2025 +890 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: mozilla.org
Status: Confirmed

CVE: CVE-2023-3600 (🔍)
GCVE (CVE): GCVE-0-2023-3600
GCVE (VulDB): GCVE-100-233879

Entryinfo

Created: 07/12/2023 18:04
Updated: 12/18/2025 20:58
Changes: 07/12/2023 18:04 (41), 08/02/2023 09:36 (11), 06/21/2025 11:19 (17), 12/18/2025 20:58 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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