Cisco SD-WAN Solution Software Denial of Service Vulnerability
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-399 and the CVSS impact.
Summary
A vulnerability in Cisco SD-WAN Solution Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to improper validation of fields in Cisco SD-WAN peering messages that are encapsulated in UDP packets. An attacker could exploit this vulnerability by sending crafted UDP messages to the targeted system. A successful exploit could allow the attacker to cause services on the device to fail, resulting in a DoS condition that could impact the targeted device and other devices that depend on it.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco SD-WAN Solution | all versions | — | No fix listed | CNA |
- Cisco SD-WAN Solution VendorCisco Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:sd-wan_firmware:*:*:*:*:*:*:*:* | before 17.2.7; 17.2.8 to before 18.3.0 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:vedge_100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:vedge_1000:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:vedge_100b:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:vedge_100m:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:vedge_100wm:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:vedge_2000:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:h:cisco:vedge_5000:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:a:cisco:vedge_cloud_router:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Cisco |
| cpe:2.3:a:cisco:vsmart_controller:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Cisco |
- cpe:2.3:o:cisco:sd-wan_firmware:*:*:*:*:*:*:*:* Versions before 17.2.7; 17.2.8 to before 18.3.0 Vulnerable ·Cisco
- cpe:2.3:h:cisco:vedge_100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:vedge_1000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:vedge_100b:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:vedge_100m:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:vedge_100wm:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:vedge_2000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:h:cisco:vedge_5000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:a:cisco:vedge_cloud_router:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Cisco
- cpe:2.3:a:cisco:vsmart_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-3351
- 2026-10-03 Alias added: GHSA-6j89-cjff-693q
References
More Cisco Sd-wan Firmware vulnerabilities
- TI-2019-12050 Cisco SD-WAN Solution vManage SQL Injection Vulnerability CVSS 3.1HIGH 8.1
- TI-2020-02938 Cisco SD-WAN vManage Software Remote Code Execution Vulnerability CVSS 3.1HIGH 8.8
- TI-2021-01028 Cisco SD-WAN Buffer Overflow Vulnerabilities CVSS 3.1CRITICAL 9.8
- TI-2021-01027 Cisco SD-WAN Buffer Overflow Vulnerabilities CVSS 3.1CRITICAL 9.8
- TI-2021-01005 Cisco SD-WAN Denial of Service Vulnerabilities CVSS 3.1HIGH 8.6
- TI-2021-01001 Cisco SD-WAN Denial of Service Vulnerabilities CVSS 3.1HIGH 8.6
Sources
- CVE-2020-3351 · CVE Program
- CVE-2020-3351 · NVD
- FIRST EPSS
- GHSA-6j89-cjff-693q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences