Is CVE-2021-27710 actively exploited?

No active exploitation of CVE-2021-27710 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-27710 be exploited remotely?

Yes. CVE-2021-27710 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-27710?

CVE-2021-27710 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-27710

CWE-78Published: April 14, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Command Injection in TOTOLINK X5000R router with firmware v9.1.0u.6118_B20201102, and TOTOLINK A720R router with firmware v4.1.5cu.470_B20200911 allows remote attackers to execute arbitrary OS commands by sending a modified HTTP request. This occurs because the function executes glibc's system function with untrusted input. In the function, "ip" parameter is directly passed to the attacker, allowing them to control the "ip" field to attack the OS.

NVD Source

Technical Analysis

CVE-2021-27710 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.