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CVE-2026-20499In 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…

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 not needed for exploitation. Patch ID: MOLY01857954; Issue ID: MSV-8247.

Timeline

  1. ID reserved

    By MediaTek

  2. · 12 months later

    Published

  3. · 2 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-20499, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High7.5CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Awaiting Analysis3.1High7.5CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.24% · top 85% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

  • MediaTek, Inc. · MediaTek chipset

    • affected MT2716
    • affected MT2735
    • affected MT2737
    • affected MT6739
    • affected MT6761
    • affected MT6762
    • affected MT6763
    • affected MT6765
    • affected MT6767
    • affected MT6768
    • affected MT6769
    • affected MT6771
    • affected MT6779
    • affected MT6781
    • affected MT6783
    • affected MT6785
    • affected MT6789
    • affected MT6813
    • affected MT6833
    • affected MT6835
    • affected MT6853
    • affected MT6855
    • affected MT6858
    • affected MT6873
    • affected MT6875
    • affected MT6877
    • affected MT6878
    • affected MT6879
    • affected MT6880
    • affected MT6881
    • affected MT6883
    • affected MT6885
    • affected MT6886
    • affected MT6889
    • affected MT6890
    • affected MT6891
    • affected MT6893
    • affected MT6895
    • affected MT6896
    • affected MT6897
    • and 42 more

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

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[![CVE-2026-20499](https://cveledger.app/badge/CVE-2026-20499.svg)](https://cveledger.app/cve/CVE-2026-20499)

Record last updated .