High severity · published Mar 2, 2026
CVE-2026-20434
In Modem, there is a possible out of bounds write due to a missing bounds check
7.5
CVSS
0.2%
EPSS
No
On KEV
Description
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: MOLY00782946; Issue ID: MSV-4135.
CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Adjacent
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MC
MediaTek chipset · MediaTek, Inc.
MT2735; MT2737; MT6739; MT6761; MT6762; MT6762D; +34 more · source: vendor
LR
Lr12a · Mediatek
All versions, or not specified · source: NVD
LR
Lr13 · Mediatek
All versions, or not specified · source: NVD
NR
Nr15 · Mediatek
All versions, or not specified · source: NVD
NR
Nr16 · Mediatek
All versions, or not specified · source: NVD
NR
Nr17 · Mediatek
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20434
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20434
Vendor Advisory
https://corp.mediatek.com/product-security-bulletin/March-2026
More from MediaTek chipset
9.8
CVE-2026-20418
In Thread, there is a possible out of bounds write due to a missing bounds check
9.3
CVE-2026-20407
In wlan STA driver, there is a possible escalation of privilege due to a missing bounds check
8.8
CVE-2026-20586
In vdec, there is a possible out of bounds write due to a missing bounds check
8.8
CVE-2026-20433
In Modem, there is a possible out of bounds write due to a missing bounds check
8.8
CVE-2026-20430
In wlan AP FW, there is a possible out of bounds write due to an incorrect bounds check