CVE-2023-39240: ASUS RT-AX55、RT-AX56U_V2 - Format String - 3

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-09-07 · updated 2026-06-17
Weakness: CWE-134

Description

It is identified a format string vulnerability in ASUS RT-AX56U V2’s iperf client function API. This vulnerability is caused by lacking validation for a specific value within its set_iperf3_cli.cgi module. A remote attacker with administrator privilege can exploit this vulnerability to perform remote arbitrary code execution, arbitrary system operation or disrupt service.

Affected products

ASUS RT-AC86U: 3.0.0.4_386_51529
ASUS RT-AX55: 3.0.0.4.386_50460
ASUS Rt-Ax56U V2 Firmware: 3.0.0.4.386_50460

References

https://www.twcert.org.tw/tw/cp-132-7356-021bf-1.html
https://www.twcert.org.tw/tw/cp-132-7356-021bf-1.html

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