Is CVE-2021-20149 actively exploited?

No active exploitation of CVE-2021-20149 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-20149 be exploited remotely?

Yes. CVE-2021-20149 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-20149?

CVE-2021-20149 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-20149

CRITICAL

CVE-2021-20149

CWE-863Published: December 30, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Trendnet AC2600 TEW-827DRU version 2.08B01 does not have sufficient access controls for the WAN interface. The default iptables ruleset for governing access to services on the device only apply to IPv4. All services running on the devices are accessible via the WAN interface via IPv6 by default.

NVD Source

Technical Analysis

CVE-2021-20149 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.