Actively exploited · Published Mar 28, 2018 · Assigned by cisco
CVE-2018-0156
High 7.5 Exploited
In plain English
A high-severity security flaw in Cisco IOS and IOS XE. Attackers are actively exploiting it in the wild (listed by CISA on March 3, 2022). The chance it is exploited in the next 30 days is estimated at 9.4% (higher than 95% of all known vulnerabilities). Apply updates per vendor instructions.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Mar 17, 2022.
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | Cisco IOS and IOS XE | Cisco IOS and IOS XE |
Weakness: CWE-399 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04 x_refsource_MISC
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-smi x_refsource_CONFIRM
- 1040596 vdb-entry, x_refsource_SECTRACK
- 103569 vdb-entry, x_refsource_BID
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05 x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0156 government-resource