CVE-2026-20311

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 vulnerability is due to insufficient error handling in the web-based management interface. An attacker could exploit this vulnerability by authenticating with a malformed certificate. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

CVSS v3 6.3 MEDIUM

6.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-webui-dos-PtAODAWW

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-05 17:16

Updated : 2026-08-06 15:44

NVD link : CVE-2026-20311

Mitre link : CVE-2026-20311

CVE.ORG link : CVE-2026-20311

JSON object : View

Products Affected

No product.

CWE

CWE-126

Buffer Over-read

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{"status": "affected", "version": "17.12.1z3"}, {"status": "affected", "version": "17.9.5f"}, {"status": "affected", "version": "17.12.4b"}, {"status": "affected", "version": "17.12.5a"}, {"status": "affected", "version": "17.18.1"}, {"status": "affected", "version": "17.12.6"}, {"status": "affected", "version": "17.12.1z4"}, {"status": "affected", "version": "17.9.8"}, {"status": "affected", "version": "17.9.7a"}, {"status": "affected", "version": "17.15.3a"}, {"status": "affected", "version": "17.15.4"}, {"status": "affected", "version": "17.12.5b"}, {"status": "affected", "version": "17.15.3b"}, {"status": "affected", "version": "17.18.1z"}, {"status": "affected", "version": "17.9.7b"}, {"status": "affected", "version": "17.12.5c"}, {"status": "affected", "version": "26.1.1"}, {"status": "affected", "version": "17.18.1a"}, {"status": "affected", "version": "17.15.4a"}, {"status": "affected", "version": "17.18.2"}, {"status": "affected", "version": "17.18.1w"}, {"status": "affected", "version": "17.15.4b"}, {"status": "affected", "version": "17.12.6a"}, {"status": "affected", "version": "17.12.7"}, {"status": "affected", "version": "17.15.4c"}, {"status": "affected", "version": "17.9.9"}, {"status": "affected", "version": "17.12.5d"}, {"status": "affected", "version": "17.15.4s1"}, {"status": "affected", "version": "17.15.5"}, {"status": "affected", "version": "17.12.1z5"}, {"status": "affected", "version": "17.18.1x"}, {"status": "affected", "version": "17.12.1z6"}, {"status": "affected", "version": "17.15.4d"}, {"status": "affected", "version": "17.12.6b"}, {"status": "affected", "version": "17.4.1c"}, {"status": "affected", "version": "17.15.5a"}, {"status": "affected", "version": "17.18.1y"}, {"status": "affected", "version": "17.12.7a"}, {"status": "affected", "version": "17.18.3"}, {"status": "affected", "version": "17.12.7b"}, {"status": "affected", "version": "17.18.3a"}, {"status": "affected", "version": "26.1.1a"}, {"status": "affected", "version": "26.2.1ea"}], "defaultStatus": "unknown"}]}], "published": "2026-08-05T17:16:51.893", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-webui-dos-PtAODAWW", "source": "psirt@cisco.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-126"}]}], "descriptions": [{"lang": "en", "value": "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.\r\n\r\nThis vulnerability is due to insufficient error handling in the web-based management interface. An attacker could exploit this vulnerability by authenticating with a malformed certificate. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition."}], "lastModified": "2026-08-06T15:44:56.043", "sourceIdentifier": "psirt@cisco.com"}