CVE-2018-0156: Cisco IOS Software and Cisco IOS XE Software Smart Install Denial-of-Service Vulnerability

CVE-2018-0156 · Severity: critical · CVSS 7.5 · Exploited in the wild · Published 2022-03-03

A vulnerability in the Smart Install feature of Cisco IOS and IOS XE Software allows an unauthenticated, remote attacker to cause a denial-of-service (DoS) condition. The flaw is due to improper validation of packet data sent to TCP port 4786, which can trigger a reload of affected client switches.

Technologies: Cisco IOS, Cisco Ios Software, Cisco IOS XE, Cisco IOS XE Software. Vendors: Cisco.

Quick answers

Is CVE-2018-0156 exploited in the wild?
Yes. CVE-2018-0156 is known to be exploited in the wild, first recorded on 3 March 2022. Treat it as urgent.
How severe is CVE-2018-0156?
Critical severity, with a CVSS score of 7.5, published 3 March 2022.
Which products and versions are affected?
Cisco IOS Software; Cisco IOS XE Software.
Is there a fix for CVE-2018-0156?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2018-0156 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2018-0156?
Check whether you run Cisco IOS, Cisco Ios Software, Cisco IOS XE or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Cisco IOS Software
  • Cisco IOS XE Software

Timeline

  • 2018-03-28: disclosed: Initial Cisco advisory publication date
  • 2022-03-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog

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