Vulnerability

CVE-2018-0172

High· 8.6KEVCVSS8.6EPSS8%

.rules3/5

Cisco IOS and 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 for denial-of-service (DoS).

Threat signal

97/100

Severe

Severity

high

CVSS

8.6

EPSS

Active

KEV

CISA KEV — actively exploited

1552d overdue

AffectedCisco — IOS and IOS XE Software

Added to KEV

2022-03-03

Federal patch due (BOD 22-01)

2022-03-17

Required action (CISA verbatim)

Apply updates per vendor instructions.

Vendor advisory + references

https://nvd.nist.gov/vuln/detail/CVE-2018-0172

CISA description: “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).”

CVSS

v3.1Open in FIRST calculator →

8.6/ 10HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionNoneFully automated — no victim action needed.
ScopeChangedImpact extends beyond the vulnerable component (e.g. sandbox escape).
Confidentiality ImpactNoneNo confidentiality impact.
Integrity ImpactNoneNo integrity impact.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

7.82%

probability of exploitation in next 30 days

p94

higher than 94% of all CVEs

6-day trend↑ 1.6pp

Mid-pack — moderate exploitation likelihood.

Vendor VEX

No VEX statements published for CVE-2018-0172. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAct

Active exploitation with total impact on essential/support systems

exploitation: active
automatable: yes
impact: total
mission: support

Lifecycle

2022-03-03Added to CISA KEVransomware: Unknown
2022-03-03Published
2022-03-17Federal patch due (BOD 22-01)
2026-06-15Last modified1 source

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.