8.6
HIGH
CVSS 3.1
CVE-2026-20301
Cisco IOS Software and IOS XE Software Extensible Messaging Client Protocol Denial of Service Vulnerability
Overview
Description
A vulnerability in the Extensible Messaging Client Protocol (XMCP), also referred to as the External Client protocol, of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of malformed XMCP packets. An attacker could exploit this vulnerability by sending a malformed XMCP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload unexpectedly, resulting in a DoS condition. The attacker does not need the XMCP client username to exploit this vulnerability.
Details
INFO
Published Date :
Aug. 5, 2026, 5:16 p.m.
Last Modified :
Aug. 5, 2026, 6:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
Apply software updates to affected Cisco devices to fix improper packet handling.
- Update Cisco IOS Software to a fixed version.
- Update Cisco IOS XE Software to a fixed version.
- Apply vendor-provided patches for XMCP vulnerability.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-20301.
| URL | Resource |
|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-20301 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-20301
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-20301 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-20301 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 05, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-20301', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-05T17:35:10.643585Z'} -
New CVE Received by [email protected]
Aug. 05, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Cisco', 'product': 'Cisco IOS XE Software', 'versions': [{'status': 'affected', 'version': '17.2.1a'}, {'status': 'affected', 'version': '16.12.1y'}, {'status': 'affected', 'version': '16.12.3s'}, {'status': 'affected', 'version': '16.7.1b'}, {'status': 'affected', 'version': '16.6.2'}, {'status': 'affected', 'version': '16.6.5'}, {'status': 'affected', 'version': '16.12.1w'}, {'status': 'affected', 'version': '16.9.1d'}, {'status': 'affected', 'version': '17.3.1'}, {'status': 'affected', 'version': '16.9.4c'}, {'status': 'affected', 'version': '16.7.1'}, {'status': 'affected', 'version': '17.2.1'}, {'status': 'affected', 'version': '16.6.8'}, {'status': 'affected', 'version': '16.9.1b'}, {'status': 'affected', 'version': '16.9.2s'}, {'status': 'affected', 'version': '16.12.4'}, {'status': 'affected', 'version': '16.12.3a'}, {'status': 'affected', 'version': '17.1.1s'}, {'status': 'affected', 'version': '16.11.1a'}, {'status': 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'affected', 'version': '15.5(1)SY6'}, {'status': 'affected', 'version': '15.2(7)E3'}, {'status': 'affected', 'version': '15.8(3)M5'}, {'status': 'affected', 'version': '15.7(3)M7'}, {'status': 'affected', 'version': '15.9(3)M2'}, {'status': 'affected', 'version': '15.2(7)E2b'}, {'status': 'affected', 'version': '15.9(3)M2a'}, {'status': 'affected', 'version': '15.2(4)E10a'}, {'status': 'affected', 'version': '15.2(7)E4'}, {'status': 'affected', 'version': '15.5(1)SY7'}, {'status': 'affected', 'version': '15.2(4)E10b'}, {'status': 'affected', 'version': '15.2(7)E3k'}, {'status': 'affected', 'version': '15.2(8)E'}, {'status': 'affected', 'version': '15.9(3)M3'}, {'status': 'affected', 'version': '15.8(3)M6'}, {'status': 'affected', 'version': '15.7(3)M8'}, {'status': 'affected', 'version': '15.8(3)M7'}, {'status': 'affected', 'version': '15.5(1)SY8'}, {'status': 'affected', 'version': '15.2(7)E5'}, {'status': 'affected', 'version': '15.2(8)E1'}, {'status': 'affected', 'version': '15.9(3)M4'}, {'status': 'affected', 'version': '15.2(8)E2'}, {'status': 'affected', 'version': '15.2(4)E10c'}, {'status': 'affected', 'version': '15.7(3)M9'}, {'status': 'affected', 'version': '15.2(2)E10b'}, {'status': 'affected', 'version': '15.2(7)E6'}, {'status': 'affected', 'version': '15.9(3)M4a'}, {'status': 'affected', 'version': '15.5(1)SY9'}, {'status': 'affected', 'version': '15.9(3)M5'}, {'status': 'affected', 'version': '15.8(3)M8'}, {'status': 'affected', 'version': '15.9(3)M6'}, {'status': 'affected', 'version': '15.9(3)M9'}, {'status': 'affected', 'version': '15.5(1)SY13'}, {'status': 'affected', 'version': '15.9(3)M8b'}, {'status': 'affected', 'version': '15.2(7)E9'}, {'status': 'affected', 'version': '15.5(1)SY12'}, {'status': 'affected', 'version': '15.7(3)M10a'}, {'status': 'affected', 'version': '15.9(3)M8'}, {'status': 'affected', 'version': '15.9(3)M8a'}, {'status': 'affected', 'version': '15.2(8)E5'}, {'status': 'affected', 'version': '15.2(7)E10'}, {'status': 'affected', 'version': '15.7(3)M10b'}, {'status': 'affected', 'version': '15.9(3)M3a'}, {'status': 'affected', 'version': '15.8(3)M3a'}, {'status': 'affected', 'version': '15.9(3)M3b'}, {'status': 'affected', 'version': '15.6(2)SP7'}, {'status': 'affected', 'version': '15.6(2)SP5'}, {'status': 'affected', 'version': '15.6(2)SP8'}, {'status': 'affected', 'version': '15.6(2)SP6'}, {'status': 'affected', 'version': '15.6(2)SP4'}, {'status': 'affected', 'version': '15.6(2)SP9'}, {'status': 'affected', 'version': '15.6(2)SP8a'}, {'status': 'affected', 'version': '15.9(3)M9a'}, {'status': 'affected', 'version': '15.2(8)E6'}, {'status': 'affected', 'version': '15.9(3)M10'}, {'status': 'affected', 'version': '15.2(7)E11'}, {'status': 'affected', 'version': '15.5(1)SY14'}, {'status': 'affected', 'version': '15.2(8)E7'}, {'status': 'affected', 'version': '15.2(4)E10e'}, {'status': 'affected', 'version': '15.9(3)M11'}, {'status': 'affected', 'version': '15.2(7)E12'}, {'status': 'affected', 'version': '15.5(1)SY15'}, {'status': 'affected', 'version': '15.2(8)E8'}, {'status': 'affected', 'version': '15.5(1)SY16'}, {'status': 'affected', 'version': '15.2(7)E13'}, {'status': 'affected', 'version': '15.9(3)M12'}, {'status': 'affected', 'version': '15.5(1)SY17'}, {'status': 'affected', 'version': '15.2(7)E14'}, {'status': 'affected', 'version': '15.9(3)M13'}], 'defaultStatus': 'unknown'}] Added Description A vulnerability in the Extensible Messaging Client Protocol (XMCP), also referred to as the External Client protocol, of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of malformed XMCP packets. An attacker could exploit this vulnerability by sending a malformed XMCP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload unexpectedly, resulting in a DoS condition. The attacker does not need the XMCP client username to exploit this vulnerability. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Added CWE CWE-606 Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.