01 Record

CVE-2018-0172

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,

HighKEVPUBLISHEDCNA: cisco

CNA base score8.6 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

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02 Description

03 Exploitation and scoring

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2022-03-03. Federal remediation due 2022-03-17.

SSVC decision

ExploitationactiveCISA reports credible evidence of active exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

7.82% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 94.2% of scored records. A rank, not a probability.

NVD base score

8.6 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2018-03-28 22:00Z8 YR AGO

Last updated

2026-01-12 21:59Z9 MO AGO

Reserved

2017-11-27

Assigning CNA

cisco

Record state

PUBLISHED

Severity

High (CVSS 8.6)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Weaknesses

CWE-20Improper Input ValidationClass
CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

96d87487e13b67f5bc920b551758a12bb5725541f55ba9cfae1dcafe1470da8b

05 Affected products

VendorProductVersionsPlatforms

n/aCisco IOS and IOS XECisco IOS and IOS XE—

06 References

ics-cert.us-cert.govhttps://ics-cert.us-cert.gov/advisories/ICSA-18-107-04x_refsource_MISC
www.tenable.comhttps://www.tenable.com/security/research/tra-2018-06x_refsource_MISC
www.securitytracker.com1040591http://www.securitytracker.com/id/1040591vdb-entryx_refsource_SECTRACK
www.securityfocus.com103552http://www.securityfocus.com/bid/103552vdb-entryx_refsource_BID
tools.cisco.comhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr1x_refsource_CONFIRM
ics-cert.us-cert.govhttps://ics-cert.us-cert.gov/advisories/ICSA-18-107-05x_refsource_MISC
www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0172government-resource