Medium severity · published Aug 5, 2026
CVE-2026-20308
Cisco IOS XE Software Web-Based Management Interface Vulnerability
4.3
CVSS
0.4%
EPSS
No
On KEV
Description
A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to perform a denial of service (DoS) attack against an affected device.
This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted input to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the web-based management interface to become unresponsive.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CI
Cisco IOS XE Software · Cisco
17.2.1a; 16.12.1y; 16.12.3s; 16.12.1w; 16.9.1d; 17.3.1; +34 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20308
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20308
sec.cloudapps.cisco.com
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-dos-qdc7qx3
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