SB2026080632 - Multiple vulnerabilities in Cisco IOS XE

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Main Vulnerability Database SB2026080632

SB2026080632 - Multiple vulnerabilities in Cisco IOS XE

Published: August 6, 2026 Updated: August 6, 2026

Security Bulletin ID SB2026080632
CSH Severity
High
Patch available
YES
Number of vulnerabilities 7
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 14% Medium 86%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 7 vulnerabilities.


1) Improper access control (CVE-ID: CVE-2026-20267)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 6.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H]


The vulnerability allows a remote user to bypass access controls.

The vulnerability exists due to improper access control in Cisco IOS XE Software when handling requests. A remote authenticated user can send a specially crafted request to bypass access controls.

The issue affects Cisco IOS XE Software running in autonomous or controller mode.


2) Buffer overflow (CVE-ID: CVE-2026-20268)

CWE-ID: CWE-119 - Memory corruption

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to memory corruption in Cisco IOS XE Software when handling requests. A remote attacker can send a specially crafted request to the system and perform a denial of service attack.

The issue affects Cisco IOS XE Software running in autonomous or controller mode.


3) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-20269)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper control of a resource through its lifetime in Cisco IOS XE Software when handling requests. A remote attacker can send a specially crafted request to cause a denial of service.

The issue affects Cisco IOS XE Software running in autonomous or controller mode.


4) Incorrect calculation (CVE-ID: CVE-2026-20270)

CWE-ID: CWE-682 - Incorrect Calculation

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to incorrect calculation in Cisco IOS XE Software when handling requests. A remote attacker can send a specially crafted request to cause a denial of service.

The issue affects Cisco IOS XE Software running in autonomous or controller mode.


5) Insufficient Control Flow Management (CVE-ID: CVE-2026-20271)

CWE-ID: CWE-691 - Insufficient Control Flow Management

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to insufficient control flow management in Cisco IOS XE Software when handling requests. A remote attacker can send a specially crafted request to cause a denial of service.

The issue affects Cisco IOS XE Software running in autonomous or controller mode.


6) Improper Neutralization of Special Elements in Output Used by a Downstream Component (CVE-ID: CVE-2026-20272)

CWE-ID: CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to execute arbitrary commands.

The vulnerability exists due to improper neutralization of special elements in Cisco IOS XE Software when processing input. A remote attacker can send specially crafted input to execute arbitrary commands.

The issue affects Cisco IOS XE Software running in autonomous or controller mode.


7) Input validation error (CVE-ID: CVE-2026-20273)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to improper input validation in Cisco IOS XE Software when processing input. A remote attacker can send specially crafted input and perform a denial of service attack.


Remediation

Install update from vendor's website.

References