CVE-2018-0173

Cisco IOS and IOS XE Software: Improper Input Validation

As of , CVE-2018-0173 in Cisco IOS and 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
0.08Higher than 94% 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 Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets can allow for denial-of-service (DoS).

CISA's description

A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a Relay Reply denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device, which the device would then forward to a DHCPv4 server. When the affected software processes the option 82 information that is encapsulated in the response from the server, an error could occur. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvg62754.

The CVE record's description, from cisco

CVE published
28 March 2018
Assigned by
cisco
CVSS
8.6 High (CVSS 3.1, from CISA-ADP)
CWE-20
Improper Input Validation
CISA SSVC, exploitation
active
CISA SSVC, automatable
no
CISA SSVC, technical impact
total

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 and IOS XE Software: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2017-6736SNMP Remote Code ExecutionCisco IOS and IOS XE SoftwarePatch this weekEPSS 0.700.70
CVE-2017-6737SNMP Remote Code ExecutionCisco IOS and IOS XE SoftwarePatch soon0.45
CVE-2017-6742SNMP Remote Code ExecutionCisco IOS and IOS XE SoftwarePatch soon0.21
CVE-2017-12240DHCP Remote Code ExecutionCisco IOS and IOS XE SoftwarePatch soon0.14
CVE-2018-0151IOS Software and Cisco IOS XE Software Quality of Service Remote Code ExecutionCisco IOS and IOS XE SoftwarePatch soon0.14
CVE-2017-6738SNMP Remote Code ExecutionCisco IOS and IOS XE SoftwarePatch soon0.11
CVE-2017-6739SNMP Remote Code ExecutionCisco IOS and IOS XE SoftwarePatch soon0.11
CVE-2017-6740SNMP Remote Code ExecutionCisco IOS and IOS XE SoftwarePatch soon0.11
CVE-2017-6743SNMP Remote Code ExecutionCisco IOS and IOS XE SoftwarePatch soon0.11
CVE-2017-12237Internet Key Exchange Denial-of-ServiceCisco IOS and IOS XE SoftwarePatch soon0.07

All 14 entries for IOS and IOS XE Software

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