CVE-2021-20859 Command injection in ELECOM LAN routers

High 8.0 Published 1 Dec 2021 Updated 3 Aug 2024

Authenticated network-adjacent attackers can execute arbitrary OS commands on ELECOM LAN routers, requiring firmware upgrades to mitigate.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-20859?

CVE-2021-20859 is a high-severity command injection vulnerability in ELECOM LAN routers, published on 1 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

ELECOM LAN routers (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167GST2H firmware v1.25 and prior, WRC-2533GS2-B firmware v1.52 and prior, WRC-2533GS2-W firmware v1.52 and prior, WRC-1750GS firmware v1.03 and prior, WRC-1750GSV firmware v2.11 and prior, WRC-1900GST firmware v1.03 and prior, WRC-2533GST firmware v1.03 and prior, WRC-2533GSTA firmware v1.03 and prior, WRC-2533GST2 firmware v1.25 and prior, WRC-2533GST2SP firmware v1.25 and prior, WRC-2533GST2-G firmware v1.25 and prior, and EDWRC-2533GST2 firmware v1.25 and prior) allows a network-adjacent authenticated attacker to execute an arbitrary OS command via unspecified vectors.

Weakness: CWE-78

Which versions are affected by CVE-2021-20859?

It affects 14 products.

Products include Elecom Edwrc-2533gst2 Firmware, Elecom Wrc-1167gst2 Firmware, Elecom Wrc-1167gst2a Firmware, Elecom Wrc-1167gst2h Firmware, Elecom Wrc-1750gs Firmware, Elecom Wrc-1750gsv Firmware and 8 more.

How do I fix CVE-2021-20859?

No fix has been published for CVE-2021-20859 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2021-20859 being exploited?

There is no known exploitation of CVE-2021-20859 in the wild and no public exploit code.

Sources

Also known as GHSA-j5x3-56mj-r5cf.