CVE-2026-20433
In Modem, there is a possible out of bounds write due to a missing bounds check.
Published Apr 7, 2026 · corrected/updated Jun 17, 2026 · mediatek mt2735 firmware · evidence confidence high
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.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-20433 is a high public vulnerability record for mediatek mt2735 firmware. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether mediatek mt2735 firmware is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: mediatek/mt2735 firmware; mediatek/mt2737 firmware; mediatek/mt6813 firmware; mediatek/mt6833 firmware. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 8.8, EPSS 0.3%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-787. Sources contributing to this record: cve_org, epss, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Apr 7, 2026 · NIST NVD
Detected
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.
Jun 17, 2026 · NIST NVD
Updated
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.
Affected
- cpe mediatek/mt2735 firmwareversion unspecified
- cpe mediatek/mt2737 firmwareversion unspecified
- cpe mediatek/mt6813 firmwareversion unspecified
- cpe mediatek/mt6833 firmwareversion unspecified
- cpe mediatek/mt6833p firmwareversion unspecified
- cpe mediatek/mt6835 firmwareversion unspecified
- cpe mediatek/mt6835t firmwareversion unspecified
- cpe mediatek/mt6853 firmwareversion unspecified
- cpe mediatek/mt6853t firmwareversion unspecified
- cpe mediatek/mt6855 firmwareversion unspecified
- cpe mediatek/mt6855t firmwareversion unspecified
- cpe mediatek/mt6873 firmwareversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-20433
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-20433
30-day exploitation probability 0.3%
first.org - NIST NVDVulnerability recordCVE-2026-20433
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
nvd.nist.gov