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Findings

CVE-2018-0174

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

Published Mar 28, 2018 · updated Jun 16, 2026 · cisco ios

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.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 28, 2018 · Catalog

    Detected

    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

  2. Mar 3, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Mar 17, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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

Required action

Apply updates per vendor instructions.

CISA due date Mar 17, 2022

Affected

  • cpe cisco/iosversion unspecified
  • cpe cisco/ios12.2\(33\)sre7a
  • cpe cisco/ios xeversion unspecified
  • cpe cisco/ios xe12.2\(33\)sre7a
  • vendor Cisco IOS XE Softwareversion unspecified

Sources

  • CISA KEVCVE-2018-0174

    A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow for denial-of-service (DoS).

    cisa.gov
  • CVE.orgCVE-2018-0174

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2018-0174

    30-day exploitation probability 7.6%

    first.org
  • NIST NVDCVE-2018-0174

    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 beca

    nvd.nist.gov

References

CVE-2018-0174 · ZeroDay Findings