MediaTek MT8796 Bluetooth FW buffer underflow

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.
7.2$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in MediaTek MT6639, MT6653, MT6985, MT6989, MT6990, MT6991, MT7925, MT7927, MT8196, MT8678 and MT8796. Affected by this issue is some unknown functionality of the component Bluetooth FW. Performing a manipulation results in buffer underflow. This vulnerability is identified as CVE-2025-20695. The attack can be initiated remotely. There is not any exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability classified as critical has been found in MediaTek MT6639, MT6653, MT6985, MT6989, MT6990, MT6991, MT7925, MT7927, MT8196, MT8678 and MT8796. This affects some unknown functionality of the component Bluetooth FW. The manipulation with an unknown input leads to a buffer underflow vulnerability. CWE is classifying the issue as CWE-124. The product writes to a buffer using an index or pointer that references a memory location prior to the beginning of the buffer. This is going to have an impact on availability. The summary by CVE is:

In Bluetooth FW, there is a possible system crash due to an uncaught exception. This could lead to remote denial of service with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS09741871; Issue ID: MSV-3317.

The advisory is shared at corp.mediatek.com. This vulnerability is uniquely identified as CVE-2025-20695 since 11/01/2024. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

Applying the patch ALPS09741871 is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-20357). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

Exploitinginfo

Class: Buffer underflow
CWE: CWE-124 / 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-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: ALPS09741871

Timelineinfo

11/01/2024 CVE reserved
07/08/2025 +248 days Advisory disclosed
07/08/2025 +0 days VulDB entry created
07/14/2025 +6 days VulDB entry last update

Sourcesinfo

Advisory: MSV-3317
Status: Confirmed

CVE: CVE-2025-20695 (🔒)
GCVE (CVE): GCVE-0-2025-20695
GCVE (VulDB): GCVE-100-315261
EUVD: 🔒

Entryinfo

Created: 07/08/2025 07:28
Updated: 07/14/2025 20:54
Changes: 07/08/2025 07:28 (55), 07/14/2025 20:54 (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

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Might our Artificial Intelligence support you?

Check our Alexa App!