Cisco IOS Software and Cisco IOS XE Software Smart Install Denial-of-Service Vulnerability
- Severity
- High7.5CVSS 3.1, High
- Known exploited
- Known exploitedFederal remediation due date: 17 Mar 2022
- Exploit prediction
- 9%
- Published
- 28 Mar 2018Updated 17 Jun 2026 · Last verified 29 Sept 2026
Description
Title, description and vendor guidance are quoted from the source records.
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.
Weakness: CWE-399, CWE-20
Known exploited
Added to CISA KEV on 3 Mar 2022
Federal remediation due date: 17 Mar 2022
Required action: Apply updates per vendor instructions.
Exploit prediction
9% probability of exploitation in the next 30 days (percentile 95%).
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Patcharo shows this vulnerability for information but does not match versions for this product yet.
- n/a Cisco IOS and IOS XE · Cisco IOS and IOS XE
References
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04(opens in a new tab)
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-smi(opens in a new tab)
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05(opens in a new tab)
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0156(opens in a new tab)
Provenance
Every fact on this page comes from the sources below. Nothing is written by an AI.
- Cisco (CVE record)
- Cisco (CVE record) · 29 Sept 2026 at 18:17 UTC · Parser patcharo-cve5/1.1.0
- CISA Known Exploited Vulnerabilities
- CISA Known Exploited Vulnerabilities · 29 Sept 2026 at 18:17 UTC · Parser patcharo-kev/1.0.0
- NVD
- NVD · 27 Sept 2026 at 23:44 UTC · Parser patcharo-nvd/1.0.0
- FIRST EPSS
- FIRST EPSS · 30 Sept 2026 at 00:17 UTC · Parser patcharo-epss/1.0.0
Last verified: 29 Sept 2026 at 18:17 UTC