CISA KEV catalog
Confirmed active exploitation.
Listed in CISA's catalog of Known Exploited Vulnerabilities: attackers are using it in real attacks. Patch it with priority.
- Name
- Cisco IOS Software and Cisco IOS XE Software Smart Install Denial-of-Service Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions.
Description
A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of packet data. An attacker could exploit this vulnerability by sending a crafted packet to an affected device on TCP port 4786. Only Smart Install client switches are affected. Cisco devices that are configured as a Smart Install director are not affected by this vulnerability. Cisco Bug IDs: CSCvd40673.
Affected products
cisco: ios; cisco: catalyst 2960-plus 24lc-l; cisco: catalyst 2960-plus 24lc-s; cisco: catalyst 2960-plus 24pc-l; cisco: catalyst 2960-plus 24pc-s; cisco: catalyst 2960-plus 24tc-l; cisco: catalyst 2960-plus 24tc-s; cisco: catalyst 2960-plus 48pst-l; cisco: catalyst 2960-plus 48pst-s; cisco: catalyst 2960-plus 48tc-l; cisco: catalyst 2960-plus 48tc-s; cisco: catalyst 2960c-12pc-l; cisco: catalyst 2960c-8pc-l; cisco: catalyst 2960c-8tc-l; cisco: catalyst 2960c-8tc-s
References10
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/c… Vendor Advisory
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/c… Vendor Advisory
- www.securityfocus.com/bid/103569 Third Party AdvisoryVDB Entry
- www.securitytracker.com/id/1040596 Third Party AdvisoryVDB Entry
- ics-cert.us-cert.gov/advisories/ICSA-18-107-04 Third Party AdvisoryUS Government Resource
- ics-cert.us-cert.gov/advisories/ICSA-18-107-05 Third Party AdvisoryUS Government Resource
- www.securityfocus.com/bid/103569 Third Party AdvisoryVDB Entry
- www.securitytracker.com/id/1040596 Third Party AdvisoryVDB Entry
- ics-cert.us-cert.gov/advisories/ICSA-18-107-04 Third Party AdvisoryUS Government Resource
- ics-cert.us-cert.gov/advisories/ICSA-18-107-05 Third Party AdvisoryUS Government Resource
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 9% percentile: 95 · as of 10 November 2026
- CWE
- CWE-399CWE-20
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.