CVE-2018-0172A 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…
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It affects cisco ios and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Mar 3, 2022; federal agencies had to remediate by Mar 17, 2022. Treat that date as your deadline.
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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 a heap overflow condition on the affected device, which will cause the device to reload and result in a DoS condition. Cisco Bug IDs: CSCvg62730.
- CVSS
- 8.6 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Weakness (CWE)
- CWE-20
- Known exploited
- Added to CISA KEV Mar 3, 2022; federal remediation due Mar 17, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 7.82% (percentile 95)
- Assigned by
- cisco
- NVD analysis
- Analyzed
- Record last updated
- Jan 12, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
cisco ios cisco:ios | all versions; all versions | NVD |
cisco ios_xe cisco:ios_xe | all versions; all versions | NVD |
References
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04x-refsource-misc, third-party-advisory, us-government-resource
- https://www.tenable.com/security/research/tra-2018-06x-refsource-misc, third-party-advisory
- http://www.securitytracker.com/id/1040591vdb-entry, x-refsource-sectrack, third-party-advisory
- http://www.securityfocus.com/bid/103552vdb-entry, x-refsource-bid, third-party-advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr1x-refsource-confirm, vendor-advisory
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05x-refsource-misc, third-party-advisory, us-government-resource
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0172us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.