Mozilla Firefox ESR up to 115.5 Start-Up nsDNSService::Init 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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6.8$5k-$25k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Mozilla Firefox ESR up to 115.5. Affected is the function nsDNSService::Init of the component Start-Up. This manipulation causes use after free. This vulnerability is handled as CVE-2023-6862. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Mozilla Firefox ESR up to 115.5 (Web Browser). Affected by this vulnerability is the function nsDNSService::Init of the component Start-Up. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A use-after-free was identified in the `nsDNSService::Init`. This issue appears to manifest rarely during start-up. This vulnerability affects Firefox ESR < 115.6 and Thunderbird < 115.6.

The weakness was released 12/19/2023. The advisory is shared at mozilla.org. This vulnerability is known as CVE-2023-6862 since 12/15/2023. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 01/22/2025).

The vulnerability scanner Nessus provides a plugin with the ID 214469 (Debian dla-3697 : firefox-esr - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 115.6 eliminates this vulnerability. The upgrade is hosted for download at mozilla.org.

The vulnerability is also documented in the vulnerability database at Tenable (214469). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
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: 214469
Nessus Name: Debian dla-3697 : firefox-esr - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Firefox ESR 115.6

Timelineinfo

12/15/2023 🔍
12/19/2023 +4 days 🔍
12/19/2023 +0 days 🔍
04/21/2025 +488 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: DLA 3697-1
Status: Confirmed

CVE: CVE-2023-6862 (🔍)
GCVE (CVE): GCVE-0-2023-6862
GCVE (VulDB): GCVE-100-248401

Entryinfo

Created: 12/19/2023 16:38
Updated: 04/21/2025 00:26
Changes: 12/19/2023 16:38 (42), 01/12/2024 19:53 (1), 01/12/2024 20:00 (11), 01/22/2025 21:02 (17), 04/21/2025 00:26 (3)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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