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CVE-2026-20110 is a medium severity vulnerability in Cisco IOS XE Software where incorrect privilege assignment allows a low-privileged authenticated local user to execute the 'start maintenance' command. Exploiting this vulnerability causes the device to enter maintenance mode, shutting down interfaces and resulting in a denial of service (DoS). Recovery requires a device administrator to manually issue the 'stop maintenance' command to restore normal operations.

This vulnerability arises from improper privilege assignment in the CLI of Cisco IOS XE Software, specifically related to the 'start maintenance' command. A low-privileged authenticated user with access to the management CLI can exploit this flaw to put the device into maintenance mode, which disables network interfaces and causes a DoS condition. The issue affects a wide range of Cisco IOS XE versions from 16.6.1 through 17.18.1a. The vulnerability does not impact confidentiality or integrity but results in availability disruption. The CVSS 3.1 base score is 6.5, reflecting local attack vector, low attack complexity, low privileges required, no user interaction, scope change, and high impact on availability.

Detailed information about CVE-2026-20110: Incorrect Privilege Assignment in Cisco Cisco IOS XE Software affecting Cisco Cisco IOS XE Software. Get real-time up

CVE-2026-20110: Incorrect Privilege Assignment in Cisco Cisco IOS XE Software - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-20110: Incorrect Privilege Assignment in Cisco Cisco IOS XE Software

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