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Vulnerability record · CVE-2018-8878 · published 27 February 2020

CVE-2018-8878: Asuswrt-merlin information exposure vulnerability

Asuswrt Merlin · Asuswrt Merlin

Information disclosure 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 acquire information on internal network devices' hostnames and MAC addresses by reading the custom_id variable on the blocking.asp page.

5.3 CVSS 3.1 Medium EPSS 1.5% · top 27.0% CWE-200 · Information exposure
5.3CVSS 3.1 base score, v2 5.0
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Information disclosure 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 acquire information on internal network devices' hostnames and MAC addresses by reading the custom_id variable on the blocking.asp page.

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

Affected products

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

References

LinkTags
https://github.com/outofhere/Research/blob/master/2018/Asus/cve_notes.md Third Party Advisory
https://github.com/outofhere/Research/blob/master/2018/Asus/cve_notes.md Third Party Advisory

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Related vulnerabilities

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

8.8CVE-2018-5721Asuswrt-merlin out-of-bounds write vulnerabilityStack-based buffer overflow in the ej_update_variables function in router/httpd/web.c on ASUS routers (when using software from https://github.com/RM…EPSS 1.9%8.8CVE-2017-12754Asuswrt-merlin memory buffer overflow vulnerabilityStack buffer overflow in httpd in Asuswrt-Merlin firmware 380.67_0RT-AC5300 and earlier for ASUS devices and ASUS firmware for ASUS RT-AC5300, RT_AC1…EPSS 2.7%8.6CVE-2025-15101Asus firmware os command injection vulnerabilityAn OS command injection vulnerability in the web management interface of certain ASUS router models allows remote authenticated administrators to exe…EPSS 0.90%5.3CVE-2018-8877Asus firmware information exposure vulnerabilityInformation disclosure in Asuswrt-Merlin firmware for ASUS devices older than 384.4 and ASUS firmware before 3.0.0.4.382.50470 for devices allows rem…EPSS 1.5%5.9CVE-2025-68686FortiOS symbolic link patch bypass exposes sensitive informationFortiOS contains an information exposure flaw (CWE-200) that lets a remote unauthenticated attacker bypass the patch for the symbolic link persistenc…KEVEPSS 30%analysed7.5CVE-2026-20133Cisco Catalyst SD-WAN Manager insufficient file system restrictions expose dataCisco Catalyst SD-WAN Software has insufficient file system restrictions that let an attacker read sensitive files on the underlying operating system…KEVEPSS 32%analysed7.5CVE-2025-31125Vite dev server improper access control exposes arbitrary filesVite's dev server fails to restrict file access when a request uses the ?inline&import or ?raw?import query patterns, allowing content of files that …KEVEPSS 65%analysed5.5CVE-2026-20805Windows Desktop Window Manager information disclosureDesktop Windows Manager (DWM) in Microsoft Windows exposes sensitive information to an unauthorized actor, allowing a local attacker with existing ac…KEVEPSS 7.2%analysed

Source: NIST National Vulnerability Database (record CVE-2018-8878), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.