CVE-2018-0156

Cisco IOS Software and Cisco IOS XE Software: Smart Install Denial-of-Service

As of , CVE-2018-0156 in Cisco IOS Software and Cisco IOS XE Software is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.

Exploited
Yes: CISA listed it on 3 March 2022
US federal deadline
17 March 202214 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
EPSS score
0.09Higher than 95% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
0.01 on 3 March 2022EPSS on the day CISA listed it.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
No vendor link in CISA's entry

What CISA says to do

Apply updates per vendor instructions.

CISA's required action

What the flaw is

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.

CISA's 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.

The CVE record's description, from cisco

CVE published
28 March 2018
Assigned by
cisco
CVSS
7.5 High (CVSS 3.1, from CISA-ADP)
CWE-399
Resource Management Errors
CISA SSVC, exploitation
active
CISA SSVC, automatable
yes
CISA SSVC, technical impact
partial

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.

IOS Software and Cisco IOS XE Software: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2018-0158IOS and XE Software Internet Key Exchange Memory LeakCisco IOS Software and Cisco IOS XE SoftwarePatch soon0.07
CVE-2018-0159IOS and XE Software Internet Key Exchange Version 1 Denial-of-ServiceCisco IOS Software and Cisco IOS XE SoftwarePatch soon0.07

Read further