CVE-2026-20446 | MediaTek MT6813 sec boot out-of-bounds write (MSV-3899 / ALPS09963054)

VDB-355710 · CVE-2026-20446 · MSV-3899 MEDIATEK MT6813 SEC BOOT OUT-OF-BOUNDS WRITE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.5 $0-$5k 1.95+ Summaryinfo A vulnerability described as critical has been identified in MediaTek MT6813. This vulnerability affects unknown code of the component sec boot. The manipulation results in out-of-bounds write. This vulnerability is known as CVE-2026-20446. Attacking locally is a requirement. No exploit is available. It is best practice to apply a patch to resolve this issue. Detailsinfo A vulnerability, which was classified as critical, was found in MediaTek MT6813 (unknown version). Affected is an unknown code block of the component sec boot. 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. CVE summarizes: In sec boot, there is a possible out of bounds write due to an integer overflow. This could lead to local denial of service, if an attacker has physical access to the device, with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS09963054; Issue ID: MSV-3899. The advisory is available at corp.mediatek.com. This vulnerability is traded as CVE-2026-20446 since 11/03/2025. The exploitability is told to be easy. Local access is required to approach this attack. The technical details are unknown and an exploit is not available. Applying the patch ALPS09963054 is able to eliminate this problem. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-19569). Productinfo Type Chip Software Vendor MediaTek Name MT6813 License commercial CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.8 VulDB Meta Temp Score: 7.5 VulDB Base Score: 7.8 VulDB Temp Score: 7.5 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info 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: Out-of-bounds write CWE: CWE-787 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: Partially Local: Yes Remote: No Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Patch Status: 🔍 0-Day Time: 🔒 Patch: ALPS09963054 Timelineinfo 11/03/2025 CVE reserved 04/07/2026 +154 days Advisory disclosed 04/07/2026 +0 days VulDB entry created 04/07/2026 +0 days VulDB entry last update Sourcesinfo Advisory: MSV-3899 Status: Confirmed CVE: CVE-2026-20446 (🔒) GCVE (CVE): GCVE-0-2026-20446 GCVE (VulDB): GCVE-100-355710 EUVD: 🔒 Entryinfo Created: 04/07/2026 07:23 Updated: 04/07/2026 08:30 Changes: 04/07/2026 07:23 (56), 04/07/2026 08:30 (1) Complete: 🔍 Cache ID: 99:C81:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸