MediaTek MT6983 tinysys out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in MediaTek MT6739, MT6761, MT6762, MT6765, MT6771, MT6789, MT6879, MT6883, MT6885, MT6893, MT6895 and MT6983. This vulnerability affects unknown code of the component tinysys. Performing a manipulation results in out-of-bounds write. This vulnerability is known as CVE-2023-20621. Attacking locally is a requirement. No exploit is available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability, which was classified as critical, was found in MediaTek MT6739, MT6761, MT6762, MT6765, MT6771, MT6789, MT6879, MT6883, MT6885, MT6893, MT6895 and MT6983 (Chip Software). This affects an unknown code of the component tinysys. 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:

In tinysys, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS07664755; Issue ID: ALPS07664755.

The weakness was published 03/08/2023 as ALPS07664755. It is possible to read the advisory at corp.mediatek.com. This vulnerability is uniquely identified as CVE-2023-20621 since 10/28/2022. The technical details are unknown and an exploit is not publicly available.

Applying the patch ALPS07664755 is able to eliminate this problem.

The vulnerability is also documented in the databases at EUVD (EUVD-2023-24800) and CERT Bund (WID-SEC-2023-0841). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Samsung Exynos
  • Samsung Android

Productinfo

Type

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.2
VulDB Temp Score: 4.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.7
NVD Vector: 🔍

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: Patch
Status: 🔍

0-Day Time: 🔍

Patch: ALPS07664755

Timelineinfo

10/28/2022 🔍
03/08/2023 +131 days 🔍
03/08/2023 +0 days 🔍
09/03/2025 +910 days 🔍

Sourcesinfo

Advisory: ALPS07664755
Status: Confirmed

CVE: CVE-2023-20621 (🔍)
GCVE (CVE): GCVE-0-2023-20621
GCVE (VulDB): GCVE-100-222555
EUVD: 🔍
CERT Bund: WID-SEC-2023-0841 - Samsung Android und Samsung Exynos: Mehrere Schwachstellen

Entryinfo

Created: 03/08/2023 09:13
Updated: 09/03/2025 23:48
Changes: 03/08/2023 09:13 (41), 04/01/2023 15:50 (11), 08/27/2025 07:18 (16), 09/03/2025 23:48 (7)
Complete: 🔍
Cache ID: 216::103

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

Discussion

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