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Findings

CVE-2018-0159

Cisco IOS and XE Software Internet Key Exchange Version 1 Denial-of-Service Vulnerability

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

A vulnerability in the implementation of Internet Key Exchange Version 1 (IKEv1) functionality in 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 is due to improper validation of specific IKEv1 packets. An attacker could exploit this vulnerability by sending crafted IKEv1 packets to an affected device during an IKE negotiation. A successful exploit could allow the attacker to cause an affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCuj73916.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 28, 2018 · Catalog

    Detected

    A vulnerability in the implementation of Internet Key Exchange Version 1 (IKEv1) functionality in 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 is due to improper validation of specific IKEv1 packets. An attacker could exploit this vulnerability

  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 implementation of Internet Key Exchange Version 1 (IKEv1) functionality in 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 is due to improper validation of specific IKEv1 packets. An attacker could exploit this vulnerability

Required action

Apply updates per vendor instructions.

CISA due date Mar 17, 2022

Affected

  • cpe cisco/ios15.3\(3\)s
  • cpe cisco/ios xe15.3\(3\)s
  • vendor Cisco IOS Software and Cisco IOS XE Softwareversion unspecified

Sources

  • CISA KEVCVE-2018-0159

    A vulnerability in the implementation of Internet Key Exchange Version 1 (IKEv1) functionality in 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.

    cisa.gov
  • CVE.orgCVE-2018-0159

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2018-0159

    30-day exploitation probability 6.9%

    first.org
  • NIST NVDCVE-2018-0159

    A vulnerability in the implementation of Internet Key Exchange Version 1 (IKEv1) functionality in 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.

    nvd.nist.gov

References