Cisco IOS and IOS XE Remote Code Execution Vulnerability
A vulnerability in the Cisco Cluster Management Protocol (CMP) processing code in Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a reload of an affected device or remotely execute code with elevated privileges.
- Vendor
- Cisco
- Product
- IOS and IOS XE
- CVSS
- 9.8
- EPSS (exploit probability)
- 99.0%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2017-3881 being exploited?
Yes. CISA added CVE-2017-3881 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 99.0% (scored November 1, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-11-13. Full cross-catalog view: /kev-comparison
CVE-2017-3881 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 (21 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 and IOS XE CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2025-20352 Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability | [ HIGH ] | 7.7 | 40.6% | |
| CVE-2023-20109 Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability | [ MEDIUM ] | 6.6 | 2.5% | |
| CVE-2017-6742 Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability | [ HIGH ] | 8.8 | 21.3% | |
| CVE-2018-0173 Cisco IOS and IOS XE Software Improper Input Validation Vulnerability | [ HIGH ] | 8.6 | 7.6% | |
| CVE-2018-0172 Cisco IOS and IOS XE Software Improper Input Validation Vulnerability | [ HIGH ] | 8.6 | 7.8% | |
| CVE-2018-0159 Cisco IOS and XE Software Internet Key Exchange Version 1 Denial-of-Service Vulnerability | [ HIGH ] | 7.5 | 6.9% | |
| CVE-2018-0158 Cisco IOS and XE Software Internet Key Exchange Memory Leak Vulnerability | [ HIGH ] | 8.6 | 7.2% | |
| CVE-2018-0156 Cisco IOS Software and Cisco IOS XE Software Smart Install Denial-of-Service Vulnerability | [ HIGH ] | 7.5 | 9.4% |