VDB-355708 · CVE-2026-20433 · MSV-4460
MEDIATEK MT8893 BASE STATION OUT-OF-BOUNDS WRITE
HISTORYDIFFRELATEJSONXMLCTI
CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score
9.4 $0-$5k 1.74+
Summaryinfo
A vulnerability labeled as critical has been found in MediaTek MT2735, MT2737, MT6813, MT6833, MT6833P, MT6835, MT6835T, MT6853, MT6853T, MT6855, MT6855T, MT6873, MT6875, MT6875T, MT6877, MT6877T, MT6877TT, MT6878, MT6878M, MT6879, MT6880, MT6883, MT6885, MT6886, MT6889, MT6890, MT6891, MT6893, MT6895, MT6895TT, MT6896, MT6897, MT6899, MT6980, MT6980D, MT6983, MT6983T, MT6985, MT6985T, MT6989, MT6989T, MT6990, MT6991, MT8668, MT8673, MT8675, MT8676, MT8678, MT8755, MT8771, MT8775, MT8791, MT8791T, MT8792, MT8793, MT8795T, MT8797, MT8798, MT8863, MT8873, MT8883 and MT8893. Affected by this issue is some unknown functionality of the component Base Station Handler. Executing a manipulation can lead to out-of-bounds write. This vulnerability appears as CVE-2026-20433. The attack may be performed from remote. There is no available exploit. It is advisable to implement a patch to correct this issue.
Detailsinfo
A vulnerability classified as very critical was found in MediaTek MT2735, MT2737, MT6813, MT6833, MT6833P, MT6835, MT6835T, MT6853, MT6853T, MT6855, MT6855T, MT6873, MT6875, MT6875T, MT6877, MT6877T, MT6877TT, MT6878, MT6878M, MT6879, MT6880, MT6883, MT6885, MT6886, MT6889, MT6890, MT6891, MT6893, MT6895, MT6895TT, MT6896, MT6897, MT6899, MT6980, MT6980D, MT6983, MT6983T, MT6985, MT6985T, MT6989, MT6989T, MT6990, MT6991, MT8668, MT8673, MT8675, MT8676, MT8678, MT8755, MT8771, MT8775, MT8791, MT8791T, MT8792, MT8793, MT8795T, MT8797, MT8798, MT8863, MT8873, MT8883 and MT8893. This vulnerability affects an unknown part of the component Base Station Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:
In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: MOLY01088681; Issue ID: MSV-4460.
The advisory is shared for download at corp.mediatek.com. This vulnerability was named CVE-2026-20433 since 11/03/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/07/2026).
Applying the patch MSV-4460 is able to eliminate this problem.
The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-19568).
Productinfo
Type
Chip Software
Vendor
MediaTek
Name
MT2735
MT2737
MT6813
MT6833
MT6833P
MT6835
MT6835T
MT6853
MT6853T
MT6855
MT6855T
MT6873
MT6875
MT6875T
MT6877
MT6877T
MT6877TT
MT6878
MT6878M
MT6879
MT6880
MT6883
MT6885
MT6886
MT6889
MT6890
MT6891
MT6893
MT6895
MT6895TT
MT6896
MT6897
MT6899
MT6980
MT6980D
MT6983
MT6983T
MT6985
MT6985T
MT6989
MT6989T
MT6990
MT6991
MT8668
MT8673
MT8675
MT8676
MT8678
MT8755
MT8771
MT8775
MT8791
MT8791T
MT8792
MT8793
MT8795T
MT8797
MT8798
MT8863
MT8873
MT8883
MT8893
License
commercial
CPE 2.3info
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CPE 2.2info
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CVSSv4info
VulDB Vector: 🔒
VulDB Reliability: 🔍
CVSSv3info
VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.4
VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔒
VulDB Reliability: 🔍
CVSSv2info
Vector Complexity Authentication Confidentiality Integrity Availability
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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: No
Local: No
Remote: Yes
Availability: 🔒
Status: Not defined
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: MSV-4460
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-4460
Status: Confirmed
CVE: CVE-2026-20433 (🔒)
GCVE (CVE): GCVE-0-2026-20433
GCVE (VulDB): GCVE-100-355708
EUVD: 🔒
Entryinfo
Created: 04/07/2026 07:21
Updated: 04/07/2026 08:30
Changes: 04/07/2026 07:21 (56), 04/07/2026 08:30 (1)
Complete: 🔍
Cache ID: 99:D51:101
Discussion
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