Home/CVE/Cisco IOS Software and Cisco IOS XE Software Improper Input Validation Vulnerability
CVE

CVE-2018-0174

Cisco IOS Software and Cisco IOS XE Software Improper Input Validation Vulnerability

A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device.

A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCuh91645.

HIGH · CVSS 8.6 ⚠ CISA KEV EPSS 0.05425
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS percentile: top 10% of all CVEs by exploitation likelihood
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-20Improper Input Validation
CWE-20Improper Input Validation
▤

Affected Products & Versions

6
cisco iosall versions
cisco ios xeall versions
cisco ios<= 15.2\(4a\)ea5
cisco ios xe<= 15.2\(4a\)ea5
cisco ios<= 15.2\(6\)e0a
cisco ios xe<= 15.2\(6\)e0a
▣

Scoring & Timeline

8.6
HIGH · CVSS v3.1 · psirt@cisco.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD28 Mar 2018 · 10:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

3
cisaKEV-CVE-2018-0174
cisco-csafcisco-sa-20180328-dhcpr3
cisa-csafcisa-csaf-csaf_files-OT-white-2018-icsa-18-107-04
🔗

References & Sources

7
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.securityfocus.com/bid/103554Broken LinkThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1040591Broken LinkThird Party AdvisoryVDB Entry
https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04Third Party AdvisoryUS Government Resource
https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05Third Party AdvisoryUS Government Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3Vendor Advisory
https://www.tenable.com/security/research/tra-2018-06Third Party Advisory
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