Cisco SD-WAN vEdge Routers Denial of Service Vulnerability
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
A vulnerability in the deep packet inspection (DPI) engine of Cisco SD-WAN vEdge Routers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper processing of FTP traffic. An attacker could exploit this vulnerability by sending crafted FTP packets through an affected device. A successful exploit could allow the attacker to make the device reboot continuously, causing a DoS condition.
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 vEdge router | all versions | — | No fix listed | CNA |
- Cisco SD-WAN vEdge router VendorCisco Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:sd-wan_firmware:19.2.0:*:*:*:*:*:*:* | 19.2.0 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:sd-wan_firmware:19.2.1:*:*:*:*:*:*:* | 19.2.1 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:sd-wan_firmware:19.2.097:*:*:*:*:*:*:* | 19.2.097 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:sd-wan_firmware:19.2.098:*:*:*:*:*:*:* | 19.2.098 | Vulnerable | 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:o:cisco:sd-wan_firmware:19.2.0:*:*:*:*:*:*:* Versions 19.2.0 Vulnerable ·Cisco
- cpe:2.3:o:cisco:sd-wan_firmware:19.2.1:*:*:*:*:*:*:* Versions 19.2.1 Vulnerable ·Cisco
- cpe:2.3:o:cisco:sd-wan_firmware:19.2.097:*:*:*:*:*:*:* Versions 19.2.097 Vulnerable ·Cisco
- cpe:2.3:o:cisco:sd-wan_firmware:19.2.098:*:*:*:*:*:*:* Versions 19.2.098 Vulnerable ·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
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-3369
- 2026-10-03 Alias added: GHSA-f3ch-8xx9-vh6w
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-2020-3369 · CVE Program
- CVE-2020-3369 · NVD
- FIRST EPSS
- GHSA-f3ch-8xx9-vh6w · 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