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TI-2018-06421 Aliases CVE-2018-8879GHSA-8c78-mq7w-pq49

Stack-based buffer overflow in Asuswrt-Merlin firmware for ASUS devices older than 384.4…

Priority MEDIUM 59CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.16707 97th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:asus:rt-ac66u_firmware:*:*:*:*:*:*:*:*before 3.0.0.4.382.50470VulnerableASUS
cpe:2.3:h:asus:rt-ac66u:-:*:*:*:*:*:*:*not specified by NVDRunning onASUS
  • cpe:2.3:o:asus:rt-ac66u_firmware:*:*:*:*:*:*:*:* Versions before 3.0.0.4.382.50470 Vulnerable ·ASUS
  • cpe:2.3:h:asus:rt-ac66u:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ASUS

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-8879
  2. 2026-10-03 Alias added: GHSA-8c78-mq7w-pq49

References

Exploit 1

Other 1

  • TI-2013-04084 Buffer overflow in Broadcom ACSD allows remote attackers to execute arbitrary code via a… CVSS 3.0CRITICAL 9.8
  • TI-2013-05311 Multiple buffer overflows in web.c in httpd on the ASUS RT-N56U and RT-AC66U routers with… CVSS 2.0HIGH 10.0
  • TI-2018-06370 ASUS RT-AC51U, RT-AC58U, RT-AC66U, RT-AC1750, RT-ACRH13, and RT-N12 D1 routers with… CVSS 3.0CRITICAL 9.8
  • TI-2018-06731 Main_Analysis_Content.asp in /apply.cgi on ASUS RT-AC66U, RT-AC68U, RT-AC86U, RT-AC88U… CVSS 3.0CRITICAL 9.8
  • TI-2013-04317 Multiple unspecified vulnerabilities in the AiCloud feature on the ASUS RT-AC66U… CVSS 2.0HIGH 10.0
  • TI-2013-04081 Symlink Traversal vulnerability in ASUS RT-AC66U and RT-N56U due to misconfiguration in the SMB service. CVSS 3.1CRITICAL 9.8
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences