Cisco IP Phone TCP Packet Flood Denial of Service Vulnerability
Priority MEDIUM 50CWE-371Published · Updated
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 · CNA. Fix status from CNA.
Summary
A vulnerability in the TCP packet processing functionality of Cisco IP Phones could allow an unauthenticated, remote attacker to cause the phone to stop responding to incoming calls, drop connected calls, or unexpectedly reload. The vulnerability is due to insufficient TCP ingress packet rate limiting. An attacker could exploit this vulnerability by sending a high and sustained rate of crafted TCP traffic to the targeted device. A successful exploit could allow the attacker to impact operations of the phone or cause the phone to reload, leading to a denial of service (DoS) condition.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0803 94th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 IP Phones with Multiplatform Firmware | all versions | — | No fix listed | CNA |
- Cisco IP Phones with Multiplatform Firmware VendorCisco Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 16
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ip_dect_210_firmware:*:*:*:*:*:*:*:* | before 4.8.1 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_dect_210:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_dect_6825_firmware:*:*:*:*:*:*:*:* | before 4.8.1 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_dect_6825:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8811_firmware:*:*:*:*:*:*:*:* | before 11.3.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8811:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8841_firmware:*:*:*:*:*:*:*:* | before 11.3.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8841:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8851_firmware:*:*:*:*:*:*:*:* | before 11.3.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8851:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:ip_dect_210_firmware:*:*:*:*:*:*:*:* Versions before 4.8.1 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_dect_210:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_dect_6825_firmware:*:*:*:*:*:*:*:* Versions before 4.8.1 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_dect_6825:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8811_firmware:*:*:*:*:*:*:*:* Versions before 11.3.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8811:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8841_firmware:*:*:*:*:*:*:*:* Versions before 11.3.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8841:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8851_firmware:*:*:*:*:*:*:*:* Versions before 11.3.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8851:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 6 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ip_phone_8861_firmware:*:*:*:*:*:*:*:* | before 11.3.2 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8861:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:unified_ip_conference_phone_8831_firmware:9.3\(4\):servicerelease3:*:*:*:*:*:* | 9.3(4) servicerelease3 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:unified_ip_conference_phone_8831:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:webex_room_phone_firmware:*:*:*:*:*:*:*:* | before 1.2.0 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:webex_room_phone:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:ip_phone_8861_firmware:*:*:*:*:*:*:*:* Versions before 11.3.2 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8861:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:unified_ip_conference_phone_8831_firmware:9.3\(4\):servicerelease3:*:*:*:*:*:* Versions 9.3(4) servicerelease3 Vulnerable ·Cisco
- cpe:2.3:h:cisco:unified_ip_conference_phone_8831:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:webex_room_phone_firmware:*:*:*:*:*:*:*:* Versions before 1.2.0 Vulnerable ·Cisco
- cpe:2.3:h:cisco:webex_room_phone:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-3574
- 2026-10-03 Alias added: GHSA-gp65-v6f3-j928
More Cisco Ip Dect 210 Firmware vulnerabilities
- TI-2023-06969 Cross-site scripting in Cisco IP Phones with Multiplatform Firmware CVSS 3.1MEDIUM 5.5
Sources
- CVE-2020-3574 · CVE Program
- CVE-2020-3574 · NVD
- FIRST EPSS
- GHSA-gp65-v6f3-j928 · 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