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Home > Cybersecurity > Critical unpatched bugs in Cisco small business routers

Critical unpatched bugs in Cisco small business routers

A critical security vulnerability in Cisco Small Business Routers has been discovered. There will be no patch or workaround will be coming for the bug, as they reached end-of-life back in 2019.


Seda Nur Cinar Seda Nur Cinar
August 20, 2021
2 min read
Critical unpatched bugs in Cisco small business routers

A critical security vulnerability in Cisco Small Business Routers (RV110W, RV130, RV130W, and RV215W models) allows remote code execution (RCE) and denial of service (DoS). This vulnerability, ranked as CVE-2021-34730, is due to improper validation of incoming UPnP traffic. There will be no patch or workaround will be coming for the bug, as they reached end-of-life back in 2019.

Determine and disable UPnP

The company released an advisory for its users. Cisco recommends some ways to determine the UPnP Configuration, saying,

“To determine whether the UPnP feature is enabled on the LAN interface of a device, open the web-based management interface and navigate to Basic Settings > UPnP. If the Disable check box is unchecked, UPnP is enabled on the device.”

To disable UPnP on the LAN interface of a device, there are two steps:

  • Open the web-based management interface and choose Basic Settings > UPnP.
  • Check the Disable check box.

Migration to the Cisco Small Business RV132W, RV160, or RV160W Routers is also recommended.

The other critical flaw is a critical BadAlloc flaw impacting BlackBerry QNX Real-Time Operating System. This bug ranked as CVE-2021-22156 allows threat actors to take over or launch DoS attacks on devices and critical infrastructure. While disclosing the bug this week, Cisco is still investigating its product line to determine which vulnerability may change products and services.

See more Cybersecurity News


Tags: Cisco Systems
Seda Nur Cinar

Seda Nur Cinar

Seda Nur Cinar is the news editor of the Cloud7 News. With more than 8 years of Linux and cloud experience, Seda is a Linux and opensource enthusiast, security researcher and a web application developer.

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