Cisco Releases Patches 3 New Critical Flaws Affecting IOS XE Software

Networking machines maker Cisco Units has rolled out patches to tackle 3 crucial security vulnerabilities in its IOS XE network running procedure that remote attackers could potentially abuse to execute arbitrary code with administrative privileges and cause a denial-of-company (DoS) affliction on vulnerable equipment.

The list of three flaws is as follows –

  • CVE-2021-34770 (CVSS score: 10.) – Cisco IOS XE Software package for Catalyst 9000 Household Wi-fi Controllers CAPWAP Distant Code Execution Vulnerability
  • CVE-2021-34727 (CVSS rating: 9.8) – Cisco IOS XE SD-WAN Software Buffer Overflow Vulnerability
  • CVE-2021-1619 (CVSS score: 9.8) – Cisco IOS XE Program NETCONF and RESTCONF Authentication Bypass Vulnerability

The most critical of the concerns is CVE-2021-34770, which Cisco calls a “logic error” that happens during the processing of CAPWAP (Manage And Provisioning of Wireless Accessibility Factors) packets that allow a central wireless Controller to handle a team of wireless entry factors.

“An attacker could exploit this vulnerability by sending a crafted CAPWAP packet to an afflicted machine,” the organization noted in its advisory. “A thriving exploit could allow for the attacker to execute arbitrary code with administrative privileges or induce the influenced system to crash and reload, ensuing in a DoS situation.”

CVE-2021-34727, on the other hand, problems an inadequate bounds check when accepting incoming community visitors to the gadget, thus letting an attacker to transmit specially-crafted visitors that could consequence in the execution of arbitrary code with root-stage privileges or lead to the device to reload. 1000 Collection Built-in Companies Routers (ISRs), 4000 Collection ISRs, ASR 1000 Sequence Aggregation Services Routers, and Cloud Products and services Router 1000V Sequence that have the SD-WAN attribute enabled are impacted by the flaw.

Last of all, CVE-2021-1619 relates to an “uninitialized variable” in the authentication, authorization, and accounting (AAA) perform of Cisco IOS XE Computer software that could allow an authenticated, distant adversary to “install, manipulate, or delete the configuration of a community device or to corrupt memory on the machine, resulting a DoS.”

Also addressed by Cisco are 15 large-severity vulnerabilities and 15 medium-severity flaws influencing distinct elements of the IOS XE computer software as perfectly as Cisco Entry Points system and Cisco SD-WAN vManage Software program. Customers and administrators are recommended to utilize the necessary updates to mitigate any probable exploitation hazard by destructive actors.

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