CVE-2018-5721 - CVE House
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Status published High CVE-2018-5721

Stack-based buffer overflow in the ej_update_variables function in router/httpd/web.c on...

Vulnerability Description

Stack-based buffer overflow in the ej_update_variables function in router/httpd/web.c on ASUS routers (when using software from https://github.com/RMerl/asuswrt-merlin) allows web authenticated attackers to execute code via a request that updates a setting. In ej_update_variables, the length of the variable action_script is not checked, as long as it includes a "_wan_if" substring.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from asuswrt-merlin

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CVE-2018-8878
Information disclosure in Asuswrt-Merlin firmware for ASUS devices older than...
Medium 5.3
CVE-2017-12754
Stack buffer overflow in httpd in Asuswrt-Merlin firmware 380.67_0RT-AC5300 and...
High 8.8

Affected Vendor

asuswrt-merlin

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Affected Software

asuswrt-merlin
Vulnerable Versions:
0

Timeline

Official Publish: January 17th, 2018
Last Modified: August 5th, 2024
Added to House: July 20th, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.