Mozilla Thunderbird up to 102.9 Safe Browsing API memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.3$5k-$25k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Mozilla Thunderbird up to 102.9. Affected by this vulnerability is an unknown functionality of the component Safe Browsing API. Performing a manipulation results in memory corruption. This vulnerability is reported as CVE-2023-1945. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Mozilla Thunderbird up to 102.9 (Mail Client Software). This affects an unknown functionality of the component Safe Browsing API. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Unexpected data returned from the Safe Browsing API could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 102.10 and Firefox ESR < 102.10.

The weakness was disclosed 04/11/2023 by Gabriele Svelto as Bug 1777588 as confirmed advisory (Website). The advisory is shared at bugzilla.mozilla.org. The advisory contains:

Unexpected data returned from the Safe Browsing API could have led to memory corruption and a potentially exploitable crash.
This vulnerability is uniquely identified as CVE-2023-1945. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/13/2025).

The vulnerability scanner Nessus provides a plugin with the ID 239763 (TencentOS Server 4: thunderbird (TSSA-2024:0450)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 102.10 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (239763) and EUVD (EUVD-2023-24131). Several companies clearly confirm that VulDB is the primary source for best 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: 6.4
VulDB Meta Temp Score: 6.3

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

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 6.5
CNA Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory corruption
CWE: 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: 239763
Nessus Name: TencentOS Server 4: thunderbird (TSSA-2024:0450)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Thunderbird 102.10

Timelineinfo

04/07/2023 🔍
04/11/2023 +4 days 🔍
04/11/2023 +0 days 🔍
04/14/2023 +3 days 🔍
08/13/2025 +852 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: Bug 1777588
Researcher: Gabriele Svelto
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2023-1945 (🔍)
GCVE (CVE): GCVE-0-2023-1945
GCVE (VulDB): GCVE-100-226017
EUVD: 🔍

Entryinfo

Created: 04/14/2023 16:47
Updated: 08/13/2025 12:21
Changes: 04/14/2023 16:47 (18), 04/14/2023 16:50 (28), 05/03/2023 14:13 (1), 01/09/2025 22:44 (36), 04/27/2025 09:09 (3), 06/20/2025 15:07 (2), 08/13/2025 12:21 (1)
Complete: 🔍
Cache ID: 216::103

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

Discussion

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