Overview
Cisco IOS XR improperly validates string input from certain fields in Cisco Discovery Protocol messages. Exploitation could allow an unauthenticated, adjacent attacker to execute code with administrative privileges or cause a reload on an affected device.
https://nvd.nist.gov/vuln/detail/CVE-2020-3118
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2020-3118 |
| Vendor / Product | Cisco — IOS XR |
| NVD Published | 2020-02-05 |
| NVD Last Modified | 2025-10-28 |
| CVSS 3.1 Score | 8.8 |
| CVSS 3.1 Vector | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Severity | HIGH |
| CWE | CWE-134 |
| CISA KEV Added | 2021-11-03 |
| CISA KEV Deadline | 2022-05-03 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Required Action
CISA BOD 22-01 Deadline: 2022-05-03.
Apply updates per vendor instructions.
Timeline
| Date | Event |
|---|---|
| 2021-11-03 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2022-05-03 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2020-3118 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |