November 3, 2021 · Applied Cybernetics Group
CVE-2020-3118 — Cisco IOS XR
Cisco IOS XR Software Discovery Protocol Format String Vulnerability
- Added to KEV
2021-11-03- Federal due date
2022-05-03- Vendor
- Cisco
- Product
- IOS XR
- EPSS
- 42.3th percentile (score 0.002, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2020-3118
CISA short description
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.
Required action
Apply updates per vendor instructions.