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.
Get the ITPro daily newsletter
Sign up today and you will receive a free copy of our Future Focus 2025 report - the leading guidance on AI, cybersecurity and other IT challenges as per 700+ senior executives
-
M&S suspends online sales as 'cyber incident' continues
News Marks & Spencer (M&S) has informed customers that all online and app sales have been suspended as the high street retailer battles a ‘cyber incident’.
By Ross Kelly
-
Manners cost nothing, unless you’re using ChatGPT
Opinion Polite users are costing OpenAI millions of dollars each year – but Ps and Qs are a small dent in what ChatGPT could cost the planet
By Ross Kelly
-
Cisco claims new smart switches provide next-level perimeter defense
News Cisco’s ‘security everywhere’ mantra has just taken on new meaning with the launch of a series of smart network switches.
By Solomon Klappholz
-
Cisco is jailbreaking AI models so you don’t have to worry about it
News Cisco's new AI Defense security solution helps organizations shore up LLM security by identifying potential flaws.
By Solomon Klappholz
-
Cisco dispels Kraken data breach claims, insists stolen data came from old attack
News Cisco has refuted claims it has suffered a data breach after the Kraken threat group posted stolen data online.
By Solomon Klappholz
-
Cisco patches critical flaws in Identity Services Engine
News Cisco has issued patches for a pair of critical vulnerabilities affecting its Identity Service Engine (ISE).
By Nicole Kobie
-
Your office is now absolutely riddled with surveillance equipment
News While workplace monitoring is shown to have a detrimental effect on morale, many firms are still charging ahead
By Nicole Kobie
-
Cisco confirms attackers stole data, shuts down access to compromised DevHub environment
News The tech giant insists that no sensitive customer information has been compromised
By Solomon Klappholz
-
Cisco confirms investigation amid data breach claims
News The networking giant says its probe is ongoing amid claims a threat actors accessed company data
By Nicole Kobie
-
Rubrik partners with Cisco to bolster cyber resilience
News Rubrik now integrates with Cisco XDR and is listed on the connectivity giant’s SolutionsPlus program
By Daniel Todd