Cisco IOS Software and Cisco 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).
- Vendor
- Cisco
- Product
- IOS XE Software
- CVSS
- 8.6
- EPSS (exploit probability)
- 7.6%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2018-0174 being exploited?
Yes. CISA added CVE-2018-0174 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 7.6% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-11-13. Full cross-catalog view: /kev-comparison
CVE-2018-0174 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (14 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Cisco IOS XE CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2023-20273 Cisco IOS XE Web UI Command Injection Vulnerability | [ HIGH ] | 7.2 | 92.9% | |
| CVE-2023-20198 Cisco IOS XE Web UI Privilege Escalation Zero-Daywrite-up | [ CRITICAL ] | 10.0 | 99.8% | |
| CVE-2017-12319 Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial-of-Service Vulnerability | [ MEDIUM ] | 5.9 | 5.2% |