CVE-2026-20308
Received Received - Intake

Denial of Service in Cisco IOS XE Software

Publication date: 2026-08-05

Last updated on: 2026-08-05

Assigner: Cisco Systems, Inc.

Description
A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted input to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the web-based management interface to become unresponsive.

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Meta Information

Published
2026-08-05
Last Modified
2026-08-05
Generated
2026-08-05
AI Q&A
2026-08-05
EPSS Evaluated
N/A
NVD
CVE-2026-20308
EUVD
EUVD-2026-53461

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
cisco ios_xe_software *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-269 The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

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Executive Summary

This vulnerability is in the web-based management interface of Cisco IOS XE Software. It allows an authenticated remote attacker with low privileges to perform a denial of service attack by sending crafted input to the interface. This can make the interface unresponsive due to insufficient input validation.

Detection Guidance

Detecting this vulnerability requires checking for affected Cisco IOS XE Software versions and monitoring the web-based management interface for unresponsiveness. Use Cisco's official tools or commands like 'show version' to verify software versions and 'show processes cpu' to check for abnormal CPU usage in the web interface process.

Impact Analysis

An attacker could exploit this to cause the web-based management interface of an affected Cisco device to become unresponsive, disrupting device management and operations. This may lead to loss of control or visibility over the device.

Compliance Impact

This vulnerability does not directly impact compliance with GDPR or HIPAA as it is a DoS issue affecting Cisco IOS XE Software's web interface. However, if exploited, it could disrupt system availability, potentially violating availability requirements in these standards.

Mitigation Strategies

Immediately update Cisco IOS XE Software to the latest patched version. Disable the web-based management interface if not required, or restrict access using access control lists (ACLs). Monitor network traffic for unusual activity targeting the web interface.

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