Cisco IOS XE Software vulnerabilities
12 known CVE vulnerabilities in Cisco IOS XE Software, translated and rated.
- CVE-2026-20272Critical
As part of an internal security review in Cisco IOS XE Software, multiple vulnerabilities related to improper neutralization of special elements (CWE-74) were discovered. Hardened software releases addressing these issues have been issued.
- CVE-2026-20267Critical
As part of an internal security review in Cisco IOS XE Software, multiple vulnerabilities related to improper access control (CWE-284) were discovered. Hardened software releases addressing these issues have been issued.
- CVE-2017-12229Critical
A vulnerability in the web-based user interface (web UI) of Cisco IOS XE 3.1 through 16.5 allows an unauthenticated remote attacker to bypass authentication to the REST API. The issue is due to insufficient input validation for the REST API.
- CVE-2026-20311Medium
A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to cause a denial of service (DoS) condition on an affected device. This is due to insufficient error handling in the web-based management interface. An attacker could exploit this by authenticating with a malformed certificate, potentially causing the device to reload.
- CVE-2026-20308Medium
A vulnerability in the web-based management interface of Cisco IOS XE Software allows an authenticated remote attacker with low privileges to perform a DoS attack. The issue is due to insufficient input validation, and exploitation can make the interface unresponsive.
- CVE-2026-20273High
A vulnerability in Cisco IOS XE Software related to improper input validation (CWE-20), discovered during an internal security review. It is addressed in a software hardening release.
- CVE-2026-20271High
A vulnerability in Cisco IOS XE Software related to insufficient control flow management (CWE-691), discovered during an internal security review. It is addressed in software hardening releases.
- CVE-2026-20270High
A vulnerability in Cisco IOS XE Software related to incorrect calculation issues (CWE-682), discovered during an internal security review. It is addressed in software hardening releases.
- CVE-2026-20269High
A vulnerability in Cisco IOS XE Software related to improper control of a resource through its lifetime (CWE-664), discovered during an internal security review. It is addressed in software hardening releases.
- CVE-2026-20268High
A vulnerability in Cisco IOS XE Software related to improper restriction of operations within the bounds of a memory buffer (CWE-119), discovered during an internal security review. It is addressed in software hardening releases.
- CVE-2026-20263High
A vulnerability in the BEEP feature of Cisco IOS XE Software allows an unauthenticated remote attacker to cause a denial of service (DoS) by sending a specific BEEP SOAP request. The issue is due to improper handling during parsing.
- CVE-2026-20124High
A vulnerability in the SNMP subsystem of Cisco IOS XE Software allows an authenticated remote attacker to cause a device reload, resulting in a denial of service (DoS). The issue is due to improper error handling when parsing SNMP requests and affects all SNMP versions (1, 2c, 3).

