CVE-2018-8879

Name: CVE-2018-8879
Creator: NVD / NIST
Published: 2019-11-21T16:15:11.72+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 17.19%

Last modified Jun 17, 2026

CVE-2018-8879 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 17.19% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

17.19%

96.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Asus	Rt-Ac66u Firmware	< 3.0.0.4.382.50470

References

https://pagedout.institute/download/PagedOut_001_beta1.pdfExploit, Third Party Advisory
https://www.asus.com/Networking/RTAC66U/HelpDesk_BIOSProduct
https://pagedout.institute/download/PagedOut_001_beta1.pdfExploit, Third Party Advisory
https://www.asus.com/Networking/RTAC66U/HelpDesk_BIOSProduct

Timeline

Published: Nov 21, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-8879?

How severe is CVE-2018-8879?

CVE-2018-8879 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 17.19% probability of exploitation in the next 30 days.

How do I fix CVE-2018-8879?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-8879?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST