MediaTek MT8893 Modem out-of-bounds write

CVSS Meta Temp Score
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Current Exploit Price (≈)
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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.
6.2$0-$5k0.81-

Summaryinfo

A vulnerability, which was classified as critical, was found in MediaTek MT2716, MT2735, MT2737, MT6779, MT6781, MT6783, MT6785, MT6789, MT6813, MT6815, MT6833, MT6835, MT6853, MT6855, MT6858, MT6873, MT6875, MT6877, MT6878, MT6879, MT6880, MT6881, MT6883, MT6885, MT6886, MT6889, MT6890, MT6891, MT6893, MT6895, MT6896, MT6897, MT6899, MT6980, MT6982, MT6983, MT6985, MT6986, MT6988, MT6989, MT6990, MT6991, MT6993, MT8668, MT8676, MT8678, MT8755, MT8771, MT8775, MT8781, MT8791, MT8791T, MT8792, MT8793, MT8796, MT8797, MT8798, MT8863, MT8873, MT8875, MT8883 and MT8893. The affected element is an unknown function of the component Modem. The manipulation results in out-of-bounds write. This vulnerability is reported as CVE-2026-20563. The attack can be launched remotely. No exploit exists. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability classified as critical has been found in MediaTek MT2716, MT2735, MT2737, MT6779, MT6781, MT6783, MT6785, MT6789, MT6813, MT6815, MT6833, MT6835, MT6853, MT6855, MT6858, MT6873, MT6875, MT6877, MT6878, MT6879, MT6880, MT6881, MT6883, MT6885, MT6886, MT6889, MT6890, MT6891, MT6893, MT6895, MT6896, MT6897, MT6899, MT6980, MT6982, MT6983, MT6985, MT6986, MT6988, MT6989, MT6990, MT6991, MT6993, MT8668, MT8676, MT8678, MT8755, MT8771, MT8775, MT8781, MT8791, MT8791T, MT8792, MT8793, MT8796, MT8797, MT8798, MT8863, MT8873, MT8875, MT8883 and MT8893. Affected is some unknown functionality of the component Modem. 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 integrity, and availability. CVE summarizes:

In Modem, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01777997; Issue ID: MSV-8905.

The advisory is shared for download at mediatek.com. This vulnerability is traded as CVE-2026-20563 since 11/03/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. 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 11/02/2026).

Applying the patch MOLY01777997 is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

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: 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: MOLY01777997

Timelineinfo

11/03/2025 CVE reserved
11/02/2026 +364 days Advisory disclosed
11/02/2026 +0 days VulDB entry created
11/02/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: mediatek.com
Status: Confirmed

CNA: MediaTek
CVE: CVE-2026-20563 (🔒)

GCVE (CVE): GCVE-0-2026-20563
GCVE (VulDB): GCVE-100-429732

Entryinfo

Created: 11/02/2026 04:03
Changes: 11/02/2026 04:03 (54)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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