CVE-2026-20431

In Modem, there is a possible system crash due to a logic error. 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: MOLY01106496; Issue ID: MSV-4467.

Published: 2026-04-07 Last update: 2026-04-10 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-20431 is rated Low Risk (34.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.31%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-20431

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.02% 0.31% +0.29%
2 2026-04-21 0.08% 0.02% -0.06%
3 2026-04-07 — 0.08% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-20431

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-20431

Affected software / configurations for CVE-2026-20431

Vendor Product Version Raw CPE
mediatek mt6813_firmware — cpe:2.3:o:mediatek:mt6813_firmware:-:*:*:*:*:*:*:*
mediatek mt6815_firmware — cpe:2.3:o:mediatek:mt6815_firmware:-:*:*:*:*:*:*:*
mediatek mt6835_firmware — cpe:2.3:o:mediatek:mt6835_firmware:-:*:*:*:*:*:*:*
mediatek mt6878_firmware — cpe:2.3:o:mediatek:mt6878_firmware:-:*:*:*:*:*:*:*
mediatek mt6897_firmware — cpe:2.3:o:mediatek:mt6897_firmware:-:*:*:*:*:*:*:*
mediatek mt6899_firmware — cpe:2.3:o:mediatek:mt6899_firmware:-:*:*:*:*:*:*:*
mediatek mt6986_firmware — cpe:2.3:o:mediatek:mt6986_firmware:-:*:*:*:*:*:*:*
mediatek mt6991_firmware — cpe:2.3:o:mediatek:mt6991_firmware:-:*:*:*:*:*:*:*
mediatek mt6993_firmware — cpe:2.3:o:mediatek:mt6993_firmware:-:*:*:*:*:*:*:*
mediatek mt8668_firmware — cpe:2.3:o:mediatek:mt8668_firmware:-:*:*:*:*:*:*:*
mediatek mt8676_firmware — cpe:2.3:o:mediatek:mt8676_firmware:-:*:*:*:*:*:*:*
mediatek mt8678_firmware — cpe:2.3:o:mediatek:mt8678_firmware:-:*:*:*:*:*:*:*
mediatek mt8755_firmware — cpe:2.3:o:mediatek:mt8755_firmware:-:*:*:*:*:*:*:*
mediatek mt8775_firmware — cpe:2.3:o:mediatek:mt8775_firmware:-:*:*:*:*:*:*:*
mediatek mt8792_firmware — cpe:2.3:o:mediatek:mt8792_firmware:-:*:*:*:*:*:*:*
mediatek mt8793_firmware — cpe:2.3:o:mediatek:mt8793_firmware:-:*:*:*:*:*:*:*
mediatek mt8863_firmware — cpe:2.3:o:mediatek:mt8863_firmware:-:*:*:*:*:*:*:*
mediatek mt8873_firmware — cpe:2.3:o:mediatek:mt8873_firmware:-:*:*:*:*:*:*:*
mediatek mt8883_firmware — cpe:2.3:o:mediatek:mt8883_firmware:-:*:*:*:*:*:*:*

References for CVE-2026-20431

cvelogic Threat Intelligence