How severe is CVE-2026-20496?

CVE-2026-20496 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-20496 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20496?

CVE-2026-20496 primarily affects Mediatek Mt6983 Firmware. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20496?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-20496 published?

CVE-2026-20496 was published on 2026-08-03 and last updated on 2026-08-19.

CVE-2026-20496

CVE-2026-20496 is a medium-severity vulnerability in Mediatek Mt6983 Firmware with a CVSS 3.x base score of 4.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 4.4)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Mediatek Mt6983 Firmware
Published: 2026-08-03
Last modified: 2026-08-19

Description

In geniezone, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11036877; Issue ID: MSV-7132.

Frequently asked questions

What is CVE-2026-20496?: In geniezone, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11036877; Issue ID: MSV-7132.
How severe is CVE-2026-20496?: CVE-2026-20496 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-20496 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20496?: CVE-2026-20496 primarily affects Mediatek Mt6983 Firmware. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20496?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-20496 published?: CVE-2026-20496 was published on 2026-08-03 and last updated on 2026-08-19.

References

https://www.mediatek.com/product-security-bulletin/August-2026

Affected products (17)

cpe:2.3:o:mediatek:mt6983_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8676_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8678_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8755_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8768_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8771_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8775_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8781_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8786_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8791t_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8792_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8793_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8796_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8797_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8798_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8799_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:mediatek:mt8910_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Mediatek Mt6983 Firmware

CVE-2026-20433 — High (CVSS 8.8): In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation…
CVE-2026-20432 — High (CVSS 8.0): In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation…
CVE-2026-20455 — High (CVSS 7.8): In geniezone, there is a possible out of bounds write due to a missing bounds check. This could lead to local…
CVE-2026-20483 — High (CVSS 7.7): In Telephony, there is a possible escalation of privilege due to a missing permission check. This could lead to local…
CVE-2026-20453 — Medium (CVSS 6.7): In geniezone, there is a possible out of bounds write due to a missing bounds check. This could lead to local…
CVE-2026-20450 — Medium (CVSS 6.5): In Modem, there is a possible system crash due to incorrect error handling. This could lead to remote denial of…

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Other CWE-125 (Out-of-bounds Read) vulnerabilities

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CVE-2024-22004 — Critical (CVSS 10.0): Due to length check, an attacker with privilege access on a Linux Nonsecure operating system can trigger a…
CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

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