Mozilla Thunderbird up to 120 TLS Socket 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 Thunderbird up to 120. This impacts an unknown function of the component TLS Socket Handler. The manipulation leads to use after free. This vulnerability is documented as CVE-2023-6859. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Mozilla Thunderbird up to 120 (Mail Client Software). This issue affects some unknown functionality of the component TLS Socket Handler. 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:

A use-after-free condition affected TLS socket creation when under memory pressure. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

The weakness was released 12/19/2023. It is possible to read the advisory at mozilla.org. The identification of this vulnerability is CVE-2023-6859 since 12/15/2023. 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 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 121 eliminates this vulnerability. The upgrade is hosted for download at mozilla.org.

The vulnerability is also documented in the vulnerability database at Tenable (214469). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

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: 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: Thunderbird 121

Timelineinfo

12/15/2023 🔍
12/19/2023 +4 days 🔍
12/19/2023 +0 days 🔍
04/20/2025 +488 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: DLA 3697-1
Status: Confirmed

CVE: CVE-2023-6859 (🔍)
GCVE (CVE): GCVE-0-2023-6859
GCVE (VulDB): GCVE-100-248411

Entryinfo

Created: 12/19/2023 16:44
Updated: 04/20/2025 23:41
Changes: 12/19/2023 16:44 (41), 01/12/2024 22:19 (1), 01/12/2024 22:32 (11), 01/22/2025 21:02 (17), 04/20/2025 23:41 (3)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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