Mozilla Thunderbird up to 102.8 Throttled Stream memory corruption

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.
6.0	$5k-$25k	0.00

Summaryinfo

A vulnerability was found in Mozilla Thunderbird up to 102.8. It has been rated as critical. This affects an unknown function of the component Throttled Stream Handler. Performing a manipulation results in memory corruption. This vulnerability is identified as CVE-2023-25752. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Mozilla Thunderbird up to 102.8 (Mail Client Software). This affects an unknown function of the component Throttled Stream Handler. 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 weakness was released 03/14/2023 by Ronald Crane as Bug 1811627 as confirmed advisory (Website). The advisory is shared at bugzilla.mozilla.org. The advisory contains:

When accessing throttled streams, the count of available bytes needed to be checked in the calling function to be within bounds. This may have lead future code to be incorrect and vulnerable.

This vulnerability is uniquely identified as CVE-2023-25752. 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 11/02/2025).

The vulnerability scanner Nessus provides a plugin with the ID 239802 (TencentOS Server 3: firefox (TSSA-2023:0043)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 102.9 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 (239802) and EUVD (EUVD-2023-29659). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Mail Client Software

Vendor

• Mozilla

Name

• Thunderbird

Version

• 102.0
• 102.1
• 102.2
• 102.3
• 102.4
• 102.5
• 102.6
• 102.7
• 102.8

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: 6.3
VulDB Meta Temp Score: 6.0

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

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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: 🔍

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

Nessus ID: 239802
Nessus Name: TencentOS Server 3: firefox (TSSA-2023:0043)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Thunderbird 102.9

Timelineinfo

02/13/2023 🔍
03/14/2023 +29 days 🔍
03/14/2023 +0 days 🔍
04/14/2023 +31 days 🔍
11/02/2025 +933 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: Bug 1811627
Researcher: Ronald Crane
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2023-25752 (🔍)
GCVE (CVE): GCVE-0-2023-25752
GCVE (VulDB): GCVE-100-225981
EUVD: 🔍

Entryinfo

Created: 04/14/2023 16:23
Updated: 11/02/2025 11:55
Changes: 04/14/2023 16:23 (16), 04/14/2023 16:24 (2), 04/14/2023 16:27 (28), 05/03/2023 10:18 (1), 06/20/2025 04:36 (17), 11/02/2025 11:55 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion

Want to stay up to date on a daily basis?

Enable the mail alert feature now!