8.6

CVE-2026-20301

Cisco IOS Software and IOS XE Software Extensible Messaging Client Protocol Denial of Service Vulnerability

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Cisco ≫ Ios Version 15.2(2)e10c
Cisco ≫ Ios Version 15.2(7)e13
Cisco ≫ Ios Version 15.2(7)e14
Cisco ≫ Ios Version 15.2(8)e8
Cisco ≫ Ios Version 15.5(1)sy16
Cisco ≫ Ios Version 15.5(1)sy17
Cisco ≫ Ios Version 15.7(3)m10
Cisco ≫ Ios Version 15.7(3)m10a
Cisco ≫ Ios Version 15.7(3)m10b
Cisco ≫ Ios Version 15.9(3)m8a
Cisco ≫ Ios Version 15.9(3)m9a
Cisco ≫ Ios Version 15.9(3)m12
Cisco ≫ Ios Version 15.9(3)m13
Cisco ≫ Ios Xe Version 3.8.10ce
Cisco ≫ Ios Xe Version 3.8.10de
Cisco ≫ Ios Xe Version 3.11.3ae
Cisco ≫ Ios Xe Version 3.11.3e
Cisco ≫ Ios Xe Version 3.11.4e
Cisco ≫ Ios Xe Version 3.11.5e
Cisco ≫ Ios Xe Version 3.11.6e
Cisco ≫ Ios Xe Version 3.11.7e
Cisco ≫ Ios Xe Version 3.11.8e
Cisco ≫ Ios Xe Version 3.11.9e
Cisco ≫ Ios Xe Version 3.11.10e
Cisco ≫ Ios Xe Version 3.11.11e
Cisco ≫ Ios Xe Version 3.11.12e
Cisco ≫ Ios Xe Version 3.11.13e
Cisco ≫ Ios Xe Version 3.11.14e
Cisco ≫ Ios Xe Version 3.16.10as
Cisco ≫ Ios Xe Version 3.16.10bs
Cisco ≫ Ios Xe Version 3.18.8asp
Cisco ≫ Ios Xe Version 3.18.9sp
Cisco ≫ Ios Xe Version 16.6.2
Cisco ≫ Ios Xe Version 16.6.3
Cisco ≫ Ios Xe Version 16.6.4
Cisco ≫ Ios Xe Version 16.6.4a
Cisco ≫ Ios Xe Version 16.6.4s
Cisco ≫ Ios Xe Version 16.6.5
Cisco ≫ Ios Xe Version 16.6.5a
Cisco ≫ Ios Xe Version 16.6.5b
Cisco ≫ Ios Xe Version 16.6.6
Cisco ≫ Ios Xe Version 16.6.7
Cisco ≫ Ios Xe Version 16.6.7a
Cisco ≫ Ios Xe Version 16.6.8
Cisco ≫ Ios Xe Version 16.6.9
Cisco ≫ Ios Xe Version 16.6.10
Cisco ≫ Ios Xe Version 16.7.1
Cisco ≫ Ios Xe Version 16.7.1a
Cisco ≫ Ios Xe Version 16.7.1b
Cisco ≫ Ios Xe Version 16.7.2
Cisco ≫ Ios Xe Version 16.7.3
Cisco ≫ Ios Xe Version 16.7.4
Cisco ≫ Ios Xe Version 16.8.1
Cisco ≫ Ios Xe Version 16.8.1a
Cisco ≫ Ios Xe Version 16.8.1b
Cisco ≫ Ios Xe Version 16.8.1c
Cisco ≫ Ios Xe Version 16.8.1d
Cisco ≫ Ios Xe Version 16.8.1e
Cisco ≫ Ios Xe Version 16.8.1s
Cisco ≫ Ios Xe Version 16.8.2
Cisco ≫ Ios Xe Version 16.8.3
Cisco ≫ Ios Xe Version 16.9.1
Cisco ≫ Ios Xe Version 16.9.1a
Cisco ≫ Ios Xe Version 16.9.1b
Cisco ≫ Ios Xe Version 16.9.1c
Cisco ≫ Ios Xe Version 16.9.1d
Cisco ≫ Ios Xe Version 16.9.1s
Cisco ≫ Ios Xe Version 16.9.2
Cisco ≫ Ios Xe Version 16.9.2a
Cisco ≫ Ios Xe Version 16.9.2s
Cisco ≫ Ios Xe Version 16.9.3
Cisco ≫ Ios Xe Version 16.9.3a
Cisco ≫ Ios Xe Version 16.9.3h
Cisco ≫ Ios Xe Version 16.9.3s
Cisco ≫ Ios Xe Version 16.9.4
Cisco ≫ Ios Xe Version 16.9.4c
Cisco ≫ Ios Xe Version 16.9.5
Cisco ≫ Ios Xe Version 16.9.5f
Cisco ≫ Ios Xe Version 16.9.6
Cisco ≫ Ios Xe Version 16.9.7
Cisco ≫ Ios Xe Version 16.9.8
Cisco ≫ Ios Xe Version 16.9.8a
Cisco ≫ Ios Xe Version 16.9.8b
Cisco ≫ Ios Xe Version 16.10.1
Cisco ≫ Ios Xe Version 16.10.1a
Cisco ≫ Ios Xe Version 16.10.1b
Cisco ≫ Ios Xe Version 16.10.1c
Cisco ≫ Ios Xe Version 16.10.1d
Cisco ≫ Ios Xe Version 16.10.1e
Cisco ≫ Ios Xe Version 16.10.1f
Cisco ≫ Ios Xe Version 16.10.1g
Cisco ≫ Ios Xe Version 16.10.1s
Cisco ≫ Ios Xe Version 16.10.2
Cisco ≫ Ios Xe Version 16.10.3
Cisco ≫ Ios Xe Version 16.11.1
Cisco ≫ Ios Xe Version 16.11.1a
Cisco ≫ Ios Xe Version 16.11.1b
Cisco ≫ Ios Xe Version 16.11.1c
Cisco ≫ Ios Xe Version 16.11.1s
Cisco ≫ Ios Xe Version 16.11.2
Cisco ≫ Ios Xe Version 16.12.1
Cisco ≫ Ios Xe Version 16.12.1a
Cisco ≫ Ios Xe Version 16.12.1c
Cisco ≫ Ios Xe Version 16.12.1s
Cisco ≫ Ios Xe Version 16.12.1t
Cisco ≫ Ios Xe Version 16.12.1w
Cisco ≫ Ios Xe Version 16.12.1x
Cisco ≫ Ios Xe Version 16.12.1y
Cisco ≫ Ios Xe Version 16.12.1z
Cisco ≫ Ios Xe Version 16.12.1z1
Cisco ≫ Ios Xe Version 16.12.1z2
Cisco ≫ Ios Xe Version 16.12.2
Cisco ≫ Ios Xe Version 16.12.2a
Cisco ≫ Ios Xe Version 16.12.2s
Cisco ≫ Ios Xe Version 16.12.2t
Cisco ≫ Ios Xe Version 16.12.3
Cisco ≫ Ios Xe Version 16.12.3a
Cisco ≫ Ios Xe Version 16.12.3s
Cisco ≫ Ios Xe Version 16.12.4
Cisco ≫ Ios Xe Version 16.12.4a
Cisco ≫ Ios Xe Version 16.12.5
Cisco ≫ Ios Xe Version 16.12.5a
Cisco ≫ Ios Xe Version 16.12.5b
Cisco ≫ Ios Xe Version 16.12.6
Cisco ≫ Ios Xe Version 16.12.6a
Cisco ≫ Ios Xe Version 16.12.7
Cisco ≫ Ios Xe Version 16.12.8
Cisco ≫ Ios Xe Version 16.12.9
Cisco ≫ Ios Xe Version 16.12.10
Cisco ≫ Ios Xe Version 16.12.10a
Cisco ≫ Ios Xe Version 16.12.11
Cisco ≫ Ios Xe Version 16.12.12
Cisco ≫ Ios Xe Version 16.12.13
Cisco ≫ Ios Xe Version 16.12.14
Cisco ≫ Ios Xe Version 16.12.15
Cisco ≫ Ios Xe Version 16.12.16
Cisco ≫ Ios Xe Version 17.1.1
Cisco ≫ Ios Xe Version 17.1.1a
Cisco ≫ Ios Xe Version 17.1.1s
Cisco ≫ Ios Xe Version 17.1.1t
Cisco ≫ Ios Xe Version 17.1.2
Cisco ≫ Ios Xe Version 17.1.3
Cisco ≫ Ios Xe Version 17.2.1
Cisco ≫ Ios Xe Version 17.2.1a
Cisco ≫ Ios Xe Version 17.2.1r
Cisco ≫ Ios Xe Version 17.2.1v
Cisco ≫ Ios Xe Version 17.2.2
Cisco ≫ Ios Xe Version 17.2.3
Cisco ≫ Ios Xe Version 17.3.1
Cisco ≫ Ios Xe Version 17.3.1a
Cisco ≫ Ios Xe Version 17.3.1w
Cisco ≫ Ios Xe Version 17.3.1x
Cisco ≫ Ios Xe Version 17.3.1z
Cisco ≫ Ios Xe Version 17.3.2
Cisco ≫ Ios Xe Version 17.3.2a
Cisco ≫ Ios Xe Version 17.3.3
Cisco ≫ Ios Xe Version 17.3.3a
Cisco ≫ Ios Xe Version 17.3.4
Cisco ≫ Ios Xe Version 17.3.4a
Cisco ≫ Ios Xe Version 17.3.4b
Cisco ≫ Ios Xe Version 17.3.4c
Cisco ≫ Ios Xe Version 17.3.5
Cisco ≫ Ios Xe Version 17.3.5a
Cisco ≫ Ios Xe Version 17.3.5b
Cisco ≫ Ios Xe Version 17.3.6
Cisco ≫ Ios Xe Version 17.3.7
Cisco ≫ Ios Xe Version 17.3.8
Cisco ≫ Ios Xe Version 17.3.8a
Cisco ≫ Ios Xe Version 17.4.1
Cisco ≫ Ios Xe Version 17.4.1a
Cisco ≫ Ios Xe Version 17.4.1b
Cisco ≫ Ios Xe Version 17.4.1c
Cisco ≫ Ios Xe Version 17.4.2
Cisco ≫ Ios Xe Version 17.4.2a
Cisco ≫ Ios Xe Version 17.5.1
Cisco ≫ Ios Xe Version 17.5.1a
Cisco ≫ Ios Xe Version 17.6.1
Cisco ≫ Ios Xe Version 17.6.1a
Cisco ≫ Ios Xe Version 17.6.1x
Cisco ≫ Ios Xe Version 17.6.1z
Cisco ≫ Ios Xe Version 17.6.1z1
Cisco ≫ Ios Xe Version 17.6.2
Cisco ≫ Ios Xe Version 17.6.3
Cisco ≫ Ios Xe Version 17.6.3a
Cisco ≫ Ios Xe Version 17.6.4
Cisco ≫ Ios Xe Version 17.6.5
Cisco ≫ Ios Xe Version 17.6.5a
Cisco ≫ Ios Xe Version 17.6.6
Cisco ≫ Ios Xe Version 17.6.6a
Cisco ≫ Ios Xe Version 17.6.7
Cisco ≫ Ios Xe Version 17.6.8
Cisco ≫ Ios Xe Version 17.6.8a
Cisco ≫ Ios Xe Version 17.7.1
Cisco ≫ Ios Xe Version 17.7.1a
Cisco ≫ Ios Xe Version 17.7.1b
Cisco ≫ Ios Xe Version 17.7.2
Cisco ≫ Ios Xe Version 17.8.1
Cisco ≫ Ios Xe Version 17.8.1a
Cisco ≫ Ios Xe Version 17.9.1
Cisco ≫ Ios Xe Version 17.9.1a
Cisco ≫ Ios Xe Version 17.9.1w
Cisco ≫ Ios Xe Version 17.9.1x
Cisco ≫ Ios Xe Version 17.9.1x1
Cisco ≫ Ios Xe Version 17.9.1y
Cisco ≫ Ios Xe Version 17.9.1y1
Cisco ≫ Ios Xe Version 17.9.2
Cisco ≫ Ios Xe Version 17.9.2a
Cisco ≫ Ios Xe Version 17.9.3
Cisco ≫ Ios Xe Version 17.9.3a
Cisco ≫ Ios Xe Version 17.9.4
Cisco ≫ Ios Xe Version 17.9.4a
Cisco ≫ Ios Xe Version 17.9.5
Cisco ≫ Ios Xe Version 17.9.5a
Cisco ≫ Ios Xe Version 17.9.5b
Cisco ≫ Ios Xe Version 17.9.5c
Cisco ≫ Ios Xe Version 17.9.5d
Cisco ≫ Ios Xe Version 17.9.5e
Cisco ≫ Ios Xe Version 17.9.5f
Cisco ≫ Ios Xe Version 17.9.6
Cisco ≫ Ios Xe Version 17.9.6a
Cisco ≫ Ios Xe Version 17.9.7
Cisco ≫ Ios Xe Version 17.9.7a
Cisco ≫ Ios Xe Version 17.9.7b
Cisco ≫ Ios Xe Version 17.9.8
Cisco ≫ Ios Xe Version 17.9.9
Cisco ≫ Ios Xe Version 17.10.1
Cisco ≫ Ios Xe Version 17.10.1a
Cisco ≫ Ios Xe Version 17.10.1b
Cisco ≫ Ios Xe Version 17.11.1
Cisco ≫ Ios Xe Version 17.11.1a
Cisco ≫ Ios Xe Version 17.12.1
Cisco ≫ Ios Xe Version 17.12.1a
Cisco ≫ Ios Xe Version 17.12.1w
Cisco ≫ Ios Xe Version 17.12.1x
Cisco ≫ Ios Xe Version 17.12.1y
Cisco ≫ Ios Xe Version 17.12.1z
Cisco ≫ Ios Xe Version 17.12.1z1
Cisco ≫ Ios Xe Version 17.12.1z2
Cisco ≫ Ios Xe Version 17.12.1z3
Cisco ≫ Ios Xe Version 17.12.1z4
Cisco ≫ Ios Xe Version 17.12.1z5
Cisco ≫ Ios Xe Version 17.12.1z6
Cisco ≫ Ios Xe Version 17.12.2
Cisco ≫ Ios Xe Version 17.12.2a
Cisco ≫ Ios Xe Version 17.12.3
Cisco ≫ Ios Xe Version 17.12.3a
Cisco ≫ Ios Xe Version 17.12.4
Cisco ≫ Ios Xe Version 17.12.4a
Cisco ≫ Ios Xe Version 17.12.4b
Cisco ≫ Ios Xe Version 17.12.5
Cisco ≫ Ios Xe Version 17.12.5a
Cisco ≫ Ios Xe Version 17.12.5b
Cisco ≫ Ios Xe Version 17.12.5c
Cisco ≫ Ios Xe Version 17.12.5d
Cisco ≫ Ios Xe Version 17.12.6
Cisco ≫ Ios Xe Version 17.12.6a
Cisco ≫ Ios Xe Version 17.12.6b
Cisco ≫ Ios Xe Version 17.12.7
Cisco ≫ Ios Xe Version 17.12.7a
Cisco ≫ Ios Xe Version 17.12.7b
Cisco ≫ Ios Xe Version 17.13.1
Cisco ≫ Ios Xe Version 17.13.1a
Cisco ≫ Ios Xe Version 17.14.1
Cisco ≫ Ios Xe Version 17.14.1a
Cisco ≫ Ios Xe Version 17.15.1
Cisco ≫ Ios Xe Version 17.15.1a
Cisco ≫ Ios Xe Version 17.15.1b
Cisco ≫ Ios Xe Version 17.15.1w
Cisco ≫ Ios Xe Version 17.15.1x
Cisco ≫ Ios Xe Version 17.15.1y
Cisco ≫ Ios Xe Version 17.15.2
Cisco ≫ Ios Xe Version 17.15.2a
Cisco ≫ Ios Xe Version 17.15.2b
Cisco ≫ Ios Xe Version 17.15.2c
Cisco ≫ Ios Xe Version 17.15.3
Cisco ≫ Ios Xe Version 17.15.3a
Cisco ≫ Ios Xe Version 17.15.3b
Cisco ≫ Ios Xe Version 17.15.4
Cisco ≫ Ios Xe Version 17.15.4a
Cisco ≫ Ios Xe Version 17.15.4b
Cisco ≫ Ios Xe Version 17.15.4c
Cisco ≫ Ios Xe Version 17.15.4d
Cisco ≫ Ios Xe Version 17.15.4s1
Cisco ≫ Ios Xe Version 17.15.5
Cisco ≫ Ios Xe Version 17.15.5a
Cisco ≫ Ios Xe Version 17.16.1
Cisco ≫ Ios Xe Version 17.16.1a
Cisco ≫ Ios Xe Version 17.17.1
Cisco ≫ Ios Xe Version 17.18.1
Cisco ≫ Ios Xe Version 17.18.1a
Cisco ≫ Ios Xe Version 17.18.1w
Cisco ≫ Ios Xe Version 17.18.1x
Cisco ≫ Ios Xe Version 17.18.1y
Cisco ≫ Ios Xe Version 17.18.1z
Cisco ≫ Ios Xe Version 17.18.2
Cisco ≫ Ios Xe Version 17.18.3
Cisco ≫ Ios Xe Version 17.18.3a
Cisco ≫ Ios Xe Version 26.1.1
Cisco ≫ Ios Xe Version 26.1.1a
Cisco ≫ Ios Xe Version 26.2.1ea
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.33% 0.252
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Cisco PSIRT 8.6 3.9 4
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-606 Unchecked Input for Loop Condition

The product does not properly check inputs that are used for loop conditions, potentially leading to a denial of service or other consequences because of excessive looping.

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t
Vendor Advisory
Mitigation