CVE-2026-20542

MEDIUM
Published Oct 5, 2026 Modified Oct 9, 2026 CWE-416

Description

In apusys, there is a possible memory corruption due to use after free. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11076799; Issue ID: MSV-8143.

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CVSS v3.1 Score

6.7
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0011
Probability of exploitation
0.01%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor Product
mediatek mt2718_firmware
mediatek mt2718
mediatek mt6878_firmware
mediatek mt6878
mediatek mt6897_firmware
mediatek mt6897
mediatek mt6899_firmware
mediatek mt6899
mediatek mt6989_firmware
mediatek mt6989
mediatek mt6991_firmware
mediatek mt6991
mediatek mt8171_firmware
mediatek mt8171
mediatek mt8188_firmware
mediatek mt8188
mediatek mt8189_firmware
mediatek mt8189
mediatek mt8196_firmware
mediatek mt8196
mediatek mt8370_firmware
mediatek mt8370
mediatek mt8371_firmware
mediatek mt8371
mediatek mt8390_firmware
mediatek mt8390
mediatek mt8391_firmware
mediatek mt8391
mediatek mt8395_firmware
mediatek mt8395
mediatek mt8678_firmware
mediatek mt8678
mediatek mt8792_firmware
mediatek mt8792
mediatek mt8793_firmware
mediatek mt8793
mediatek mt8796_firmware
mediatek mt8796

References

Frequently Asked Questions

What is CVE-2026-20542? +
In apusys, there is a possible memory corruption due to use after free. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11076799; Issue ID: MSV-8143. It has a CVSS v3.1 base score of 6.7 (MEDIUM).
How severe is CVE-2026-20542? +
CVE-2026-20542 has a CVSS v3.1 score of 6.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0011, placing it in the 0th percentile for exploitation probability.
What products are affected by CVE-2026-20542? +
CVE-2026-20542 affects products from mediatek, specifically: mt2718, mt2718_firmware, mt6878, mt6878_firmware, mt6897, mt6897_firmware, mt6899, mt6899_firmware, mt6989, mt6989_firmware, mt6991, mt6991_firmware, mt8171, mt8171_firmware, mt8188, mt8188_firmware, mt8189, mt8189_firmware, mt8196, mt8196_firmware, mt8370, mt8370_firmware, mt8371, mt8371_firmware, mt8390, mt8390_firmware, mt8391, mt8391_firmware, mt8395, mt8395_firmware, mt8678, mt8678_firmware, mt8792, mt8792_firmware, mt8793, mt8793_firmware, mt8796, mt8796_firmware. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2026-20542? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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