CVE-2020-28347: tdpServer on TP-Link Archer A7 AC1750 devices before 201029 allows remote attackers to execute arbitrary code via the slave_mac parameter. NOTE: this issue…

PriorityP181critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EXPLOIT

EPSS

73.85%

99.4th percentile

tdpServer on TP-Link Archer A7 AC1750 devices before 201029 allows remote attackers to execute arbitrary code via the slave_mac parameter. NOTE: this issue exists because of an incomplete fix for CVE-2020-10882 in which shell quotes are mishandled.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
tp-link	ac1750_firmware	< 201029	201029

Detection & IOCsextracted from sources · hover to see the quote

path/usr/bin/tdpServer↗

processtdpServer↗

otherslave_mac↗

→Monitor for command injection attempts targeting the slave_mac parameter in tdpServer traffic on the LAN interface; shell quote mishandling (bypass of CVE-2020-10882 patch) enables arbitrary command execution as root. ↗
→Exploitation is LAN-side only and requires no authentication; alert on unexpected outbound connections or binary downloads initiated from the router process tdpServer post-exploitation. ↗
→The updated injection technique (November 2020 bypass) works on older firmware too; treat all TP-Link Archer A7/C7 firmware versions prior to 201029/201030 as vulnerable. ↗

·Exploitation is restricted to the LAN segment; the vulnerability is not remotely exploitable from the WAN side. ↗
·Affected scope is specifically TP-Link Archer A7/C7 (AC1750) hardware version 5, MIPS architecture; firmware versions before 201029 (A7) and 201030 (C7) are vulnerable. ↗

CVSS provenance

nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvdv2.010.0CRITICALAV:N/AC:L/Au:N/C:C/I:C/A:C

CVEs like this are exactly what “Exploited This Week” covers.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.