CVE-2026-20301 (GCVE-0-2026-20301)
Vulnerability from cvelistv5
Published
2026-08-05 16:28
Modified
2026-08-05 17:45
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-606 - Unchecked Input for Loop Condition
Summary
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.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco IOS XE Software |
Version: 17.2.1a Version: 16.12.1y Version: 16.12.3s Version: 16.7.1b Version: 16.6.2 Version: 16.6.5 Version: 16.12.1w Version: 16.9.1d Version: 17.3.1 Version: 16.9.4c Version: 16.7.1 Version: 17.2.1 Version: 16.6.8 Version: 16.9.1b Version: 16.9.2s Version: 16.12.4 Version: 16.12.3a Version: 17.1.1s Version: 16.11.1a Version: 16.7.2 Version: 16.11.1b Version: 16.9.1s Version: 16.9.3h Version: 16.9.1c Version: 16.6.5a Version: 16.6.3 Version: 16.10.1f Version: 17.2.1v Version: 16.8.1e Version: 16.9.3a Version: 16.12.1a Version: 16.12.1x Version: 3.16.10aS Version: 16.6.4s Version: 16.10.1c Version: 16.12.3 Version: 16.11.2 Version: 16.6.5b Version: 16.12.2s Version: 16.10.1b Version: 16.7.3 Version: 16.6.7 Version: 16.9.6 Version: 16.9.2 Version: 16.10.1 Version: 16.12.1t Version: 16.9.1 Version: 16.8.1a Version: 3.18.8aSP Version: 16.9.3s Version: 16.6.7a Version: 16.12.2 Version: 16.11.1 Version: 16.9.3 Version: 16.11.1s Version: 16.12.1 Version: 17.1.1 Version: 17.1.2 Version: 16.10.1d Version: 17.1.1t Version: 16.9.4 Version: 16.8.3 Version: 16.12.2t Version: 16.9.5 Version: 16.8.1s Version: 16.10.1e Version: 16.8.2 Version: 16.6.4 Version: 16.8.1b Version: 16.10.1a Version: 16.12.1z Version: 16.8.1c Version: 16.9.1a Version: 16.9.5f Version: 16.6.4a Version: 16.10.1g Version: 16.8.1 Version: 16.6.6 Version: 16.9.2a Version: 16.8.1d Version: 16.10.3 Version: 16.7.1a Version: 16.11.1c Version: 16.10.1s Version: 17.2.1r Version: 17.1.1a Version: 16.10.2 Version: 16.12.2a Version: 16.12.1c Version: 16.12.1s Version: 16.7.4 Version: 3.18.9SP Version: 17.2.2 Version: 3.11.3E Version: 16.9.8 Version: 16.9.7 Version: 17.1.3 Version: 17.3.1a Version: 3.11.4E Version: 17.3.2a Version: 16.12.5 Version: 17.3.1w Version: 17.3.2 Version: 3.11.3aE Version: 17.4.1 Version: 16.12.4a Version: 17.4.1a Version: 3.16.10bS Version: 17.3.1x Version: 17.3.3 Version: 16.6.9 Version: 17.2.3 Version: 17.5.1 Version: 16.12.1z1 Version: 16.12.5a Version: 17.4.1b Version: 17.3.1z Version: 16.12.5b Version: 17.4.2 Version: 17.3.3a Version: 3.11.5E Version: 17.3.5 Version: 17.3.4 Version: 17.5.1a Version: 16.12.6 Version: 17.6.1 Version: 16.12.1z2 Version: 16.6.10 Version: 17.3.4a Version: 17.6.1a Version: 3.8.10cE Version: 17.7.1 Version: 17.6.1x Version: 17.6.2 Version: 16.12.6a Version: 17.3.4c Version: 17.4.2a Version: 17.3.4b Version: 17.7.1a Version: 16.12.7 Version: 17.8.1a Version: 17.6.3a Version: 17.6.3 Version: 17.7.2 Version: 17.7.1b Version: 17.9.1w Version: 17.3.5a Version: 17.6.1z Version: 3.8.10dE Version: 16.12.8 Version: 17.8.1 Version: 17.9.1 Version: 3.11.6E Version: 17.6.4 Version: 3.11.7E Version: 17.3.5b Version: 17.9.1a Version: 17.3.6 Version: 17.10.1 Version: 3.11.8E Version: 16.9.8a Version: 17.6.1z1 Version: 17.10.1a Version: 17.9.2 Version: 17.6.5 Version: 17.9.1x Version: 17.9.1y Version: 16.9.8b Version: 17.3.7 Version: 17.9.2a Version: 17.9.3 Version: 16.12.9 Version: 17.11.1 Version: 17.10.1b Version: 17.6.6 Version: 17.9.1x1 Version: 17.11.1a Version: 17.9.3a Version: 17.12.1 Version: 17.3.8 Version: 17.9.4 Version: 16.12.10 Version: 17.12.1w Version: 17.9.1y1 Version: 17.12.1a Version: 3.11.9E Version: 17.9.5 Version: 17.13.1 Version: 17.12.1x Version: 17.12.2 Version: 17.14.1 Version: 17.9.4a Version: 17.3.8a Version: 17.6.6a Version: 17.6.5a Version: 17.6.7 Version: 16.12.10a Version: 17.15.1 Version: 17.13.1a Version: 17.12.2a Version: 16.12.11 Version: 17.12.3 Version: 17.12.1y Version: 3.11.10E Version: 17.12.1z Version: 17.9.5a Version: 17.14.1a Version: 17.9.5b Version: 17.6.8 Version: 16.12.12 Version: 17.12.4 Version: 17.9.6 Version: 17.17.1 Version: 17.16.1 Version: 17.15.1w Version: 17.12.3a Version: 3.11.11E Version: 17.9.5c Version: 17.15.1a Version: 17.12.1z1 Version: 17.15.2 Version: 17.15.1b Version: 17.9.5d Version: 17.15.1x Version: 17.9.6a Version: 17.12.1z2 Version: 17.6.8a Version: 17.16.1a Version: 16.12.13 Version: 17.15.3 Version: 17.9.7 Version: 17.12.5 Version: 17.15.1y Version: 17.9.5e Version: 17.12.4a Version: 17.15.2a Version: 17.15.2c Version: 17.15.2b Version: 17.12.1z3 Version: 17.9.5f Version: 17.12.4b Version: 3.11.12E Version: 17.12.5a Version: 17.18.1 Version: 17.12.6 Version: 17.12.1z4 Version: 17.9.8 Version: 17.9.7a Version: 17.15.3a Version: 17.15.4 Version: 3.11.13E Version: 17.12.5b Version: 17.15.3b Version: 16.12.14 Version: 17.18.1z Version: 17.9.7b Version: 17.12.5c Version: 26.1.1 Version: 17.18.1a Version: 17.15.4a Version: 17.18.2 Version: 17.18.1w Version: 17.15.4b Version: 17.12.6a Version: 17.12.7 Version: 17.15.4c Version: 17.9.9 Version: 17.12.5d Version: 16.12.15 Version: 17.15.4s1 Version: 17.15.5 Version: 17.12.1z5 Version: 17.18.1x Version: 17.12.1z6 Version: 17.15.4d Version: 17.12.6b Version: 17.4.1c Version: 3.11.14E Version: 17.15.5a Version: 17.18.1y Version: 17.12.7a Version: 17.18.3 Version: 17.12.7b Version: 17.18.3a Version: 26.1.1a Version: 26.2.1ea Version: 16.12.16 |
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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.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xmcp-thbAr34t\", \"name\": \"cisco-sa-ios-xmcp-thbAr34t\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.\"}], \"source\": {\"advisory\": \"cisco-sa-ios-xmcp-thbAr34t\", \"discovery\": \"INTERNAL\", \"defects\": [\"CSCwu20827\"]}, \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"Unchecked Input for Loop Condition\", \"type\": \"cwe\", \"cweId\": \"CWE-606\"}]}], \"affected\": [{\"vendor\": \"Cisco\", \"product\": \"Cisco IOS XE Software\", \"versions\": [{\"version\": \"17.2.1a\", \"status\": \"affected\"}, {\"version\": \"16.12.1y\", \"status\": \"affected\"}, {\"version\": 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\"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\", \"status\": \"affected\"}], \"defaultStatus\": \"unknown\"}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-08-05T16:28:37.635Z\"}}, \"adp\": [{\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-20301\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-05T17:35:10.643585Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-08-05T17:39:00.784Z\"}, \"title\": \"CISA ADP Vulnrichment\"}]}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20301\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"cisco\", \"dateReserved\": \"2025-10-08T11:59:15.408Z\", \"datePublished\": \"2026-08-05T16:28:37.635Z\", \"dateUpdated\": \"2026-08-05T16:28:37.635Z\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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