Samsung Devices KnoxVault Trustlet out-of-bounds write

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Samsung Devices. The affected element is an unknown function of the component KnoxVault Trustlet. Performing a manipulation results in out-of-bounds write. This vulnerability is identified as CVE-2025-20983. The attack is only possible with local access. There is not any exploit available.

Detailsinfo

A vulnerability was found in Samsung Devices (version now known). It has been classified as critical. This affects some unknown processing of the component KnoxVault Trustlet. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Out-of-bounds write in checking auth secret in KnoxVault trustlet prior to SMR Jul-2025 Release 1 allows local privileged attackers to write out-of-bounds memory.

The advisory is shared at security.samsungmobile.com. This vulnerability is uniquely identified as CVE-2025-20983 since 11/06/2024. The exploitability is told to be difficult. An attack has to be approached locally. The exploitation needs additional levels of successful authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/11/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-20452). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 6.4
VulDB Temp Score: 6.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.4
CNA Vector (SamsungMobile): 🔒

CVSSv2info

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

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

11/06/2024 CVE reserved
07/08/2025 +243 days Advisory disclosed
07/08/2025 +0 days VulDB entry created
07/11/2025 +3 days VulDB entry last update

Sourcesinfo

Vendor: samsung.com

Advisory: security.samsungmobile.com
Status: Confirmed

CVE: CVE-2025-20983 (🔒)
GCVE (CVE): GCVE-0-2025-20983
GCVE (VulDB): GCVE-100-315321
EUVD: 🔒

Entryinfo

Created: 07/08/2025 13:32
Updated: 07/11/2025 08:51
Changes: 07/08/2025 13:32 (61), 07/11/2025 08:51 (1)
Complete: 🔍
Cache ID: 216::103

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

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