CVE-2026-20110 Details
Description
A vulnerability in the CLI of Cisco IOS XE Software could allow an authenticated, local attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because incorrect privileges are associated with the start maintenance command. An attacker could exploit this vulnerability by accessing the management CLI of the affected device as a low-privileged user and using the start maintenance command. A successful exploit could allow the attacker to put the device in maintenance mode, which shuts down interfaces, resulting in a denial of service (DoS) condition. In case of exploitation, a device administrator can connect to the CLI and use the stop maintenance command to restore operations.
A denial-of-service vulnerability has been identified in the CLI of Cisco IOS XE Software. This issue allows an authenticated, local attacker to cause a DoS condition on the affected device. The vulnerability arises from incorrect privilege assignments related to the 'start maintenance' command. An attacker with low privileges can access the management CLI and use this command to put the device into maintenance mode, shutting down interfaces and disrupting service. Although the device can be restored by using the 'stop maintenance' command, the vulnerability could still be exploited again.
Cisco has released software updates to address this vulnerability. Instructions for upgrading to the fixed software can be found on the Cisco Security Advisories page. Additionally, a temporary workaround is available by manually setting the privilege level of the 'start maintenance' command to level 15.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 27, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-mntc-dos-LZweQcyq | [email protected] |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-266 | Incorrect Privilege Assignment | [email protected] |
Affected Products
No affected product data is available for this CVE.
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 25, 2026 | New CVE Received | [email protected] |