#VU73759 Stack-based buffer overflow in Archer AX21 - CVE-2023-27333

Vulnerability identifier: #VU73759

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-27333

CWE-ID: CWE-121

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Archer AX21
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: TP-Link

Description

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the handling of command 0x422 provided to the tmpServer service. A remote administrator on the local network can trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Archer AX21: before 3.6_230219

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External links
https://www.zerodayinitiative.com/advisories/ZDI-23-244/
https://www.tp-link.com/us/support/download/archer-ax21/#Firmware

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.