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Vulnerability record · CVE-2018-8879 · published 21 November 2019

CVE-2018-8879: Asus rt-ac66u firmware out-of-bounds write vulnerability

Asus · Rt Ac66u Firmware

Stack-based buffer overflow in Asuswrt-Merlin firmware for ASUS devices older than 384.4 and ASUS firmware before 3.0.0.4.382.50470 for devices allows remote attackers to execute arbitrary code by providing a long string to the blocking.asp page via a GET or POST request. Vulnerable parameters are flag, mac, and cat_id.

9.8 CVSS 3.1 Critical EPSS 17% · top 3.0% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Stack-based buffer overflow in Asuswrt-Merlin firmware for ASUS devices older than 384.4 and ASUS firmware before 3.0.0.4.382.50470 for devices allows remote attackers to execute arbitrary code by providing a long string to the blocking.asp page via a GET or POST request. Vulnerable parameters are flag, mac, and cat_id.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://pagedout.institute/download/PagedOut_001_beta1.pdf ExploitThird Party Advisory
https://www.asus.com/Networking/RTAC66U/HelpDesk_BIOS Product
https://pagedout.institute/download/PagedOut_001_beta1.pdf ExploitThird Party Advisory
https://www.asus.com/Networking/RTAC66U/HelpDesk_BIOS Product

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-8879), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.