Cisco warns of flaws that could disrupt voice calls

Problems in its unified communications software could allow a denial of service attack.

Cisco has warned customers about faults in its unified communications software, which could allow for a denial of service (DoS) attack and the disruption of voice services.

A security alert said that there were faults in Cisco's unified communications manager, a call processing system that extends "enterprise telephony features" to network devices such as IP phones.

Two DoS vulnerabilities are around the processing of SIP packets. The vulnerabilities can be triggered by a malformed SIP message and cause a 'critical" process to fail, disrupting voice services.

Other DoS vulnerabilities include an issue with the tracking of network connections, and two others involving the processing of SIP and SCCP packets.

Cisco said it was not yet aware of any attacks trying to take advantage of flaws found in the advisory.

The alert was published a day after Cisco warned about problems with its Wireless LAN devices, which leave it open to a DoS attack.

Featured Resources

The definitive guide to warehouse efficiency

Get your free guide to creating efficiencies in the warehouse

Free download

The total economic impact™ of Datto

Cost savings and business benefits of using Datto Integrated Solutions

Download now

Three-step guide to modern customer experience

Support the critical role CX plays in your business

Free download

Ransomware report

The global state of the channel

Download now

Recommended

The IT Pro Podcast: Can 5G close the digital divide?
5G

The IT Pro Podcast: Can 5G close the digital divide?

6 Aug 2021
Cisco launches Webex for Defense for the Pentagon
Software

Cisco launches Webex for Defense for the Pentagon

7 Jul 2021
Cisco flaw under attack after researchers publish exploit PoC
exploits

Cisco flaw under attack after researchers publish exploit PoC

28 Jun 2021
Cisco bolsters Webex for the hybrid workforce
video conferencing

Cisco bolsters Webex for the hybrid workforce

9 Jun 2021

Most Popular

How to find RAM speed, size and type
Laptops

How to find RAM speed, size and type

17 Sep 2021
What are the pros and cons of AI?
machine learning

What are the pros and cons of AI?

8 Sep 2021
The technology powering the future of shopping
Technology

The technology powering the future of shopping

16 Sep 2021