Out-of-bounds write in Cisco IP Phones with Multiplatform Firmware
Priority MEDIUM 41CWE-787Published · Updated
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 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
A vulnerability in the web-based management interface of Cisco IP Phone firmware could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a DoS condition. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the affected device to reload.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00881 59th 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 | 11.3.1 MSR2-6; 11.3.1 MSR3-3; 11.3.2; 11.3.3; 11.3.1 MSR4-1; 11.3.4; 11.3.5; 11.3.3 MSR2; 11.3.3 MSR1; 11.3.6; 11-3-1MPPSR4UPG; 11.3.7; 11-3-1MSR2UPG; 11.3.6SR1; 11.3.7SR1; 11.3.7SR2; 11.0.0; 11.0.1; 11.0.1 MSR1-1; 11.0.2; 11.1.1; 11.1.1 MSR1-1; 11.1.1 MSR2-1; 11.1.2; 11.1.2 MSR1-1; 11.1.2 MSR3-1; 11.2.1; 11.2.2; 11.2.3; 11.2.3 MSR1-1; 11.2.4; 11.3.1; 11.3.1 MSR1-3; 4.5; 4.6 MSR1; 4.7.1; 4.8.1; 4.8.1 SR1; 5.0.1; 12.0.1; 12.0.2; 12.0.3; 12.0.3SR1; 12.0.4; 5.1.1; 5.1.2; 5.1(2)SR1 | — | No fix listed | CNA |
| Cisco | Cisco PhoneOS | 1.0.1; 2.1.1; 2.0.1; 2.3.1 | — | No fix listed | CNA |
- Cisco IP Phones with Multiplatform Firmware VendorCisco Affected 11.3.1 MSR2-6; 11.3.1 MSR3-3; 11.3.2; 11.3.3; 11.3.1 MSR4-1; 11.3.4; 11.3.5; 11.3.3 MSR2; 11.3.3 MSR1; 11.3.6; 11-3-1MPPSR4UPG; 11.3.7; 11-3-1MSR2UPG; 11.3.6SR1; 11.3.7SR1; 11.3.7SR2; 11.0.0; 11.0.1; 11.0.1 MSR1-1; 11.0.2; 11.1.1; 11.1.1 MSR1-1; 11.1.1 MSR2-1; 11.1.2; 11.1.2 MSR1-1; 11.1.2 MSR3-1; 11.2.1; 11.2.2; 11.2.3; 11.2.3 MSR1-1; 11.2.4; 11.3.1; 11.3.1 MSR1-3; 4.5; 4.6 MSR1; 4.7.1; 4.8.1; 4.8.1 SR1; 5.0.1; 12.0.1; 12.0.2; 12.0.3; 12.0.3SR1; 12.0.4; 5.1.1; 5.1.2; 5.1(2)SR1 Fixed in — No fix listed CNA
- Cisco PhoneOS VendorCisco Affected 1.0.1; 2.1.1; 2.0.1; 2.3.1 Fixed in — No fix listed CNA
CPE configurations NVD · 36
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:video_phone_8875_firmware:*:*:*:*:*:*:*:* | before 2.3.1.0101 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:video_phone_8875:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_6821_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_6821:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_6841_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_6841:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_6851_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_6851:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_6861_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_6861:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:video_phone_8875_firmware:*:*:*:*:*:*:*:* Versions before 2.3.1.0101 Vulnerable ·Cisco
- cpe:2.3:h:cisco:video_phone_8875:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_6821_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_6821:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_6841_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_6841:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_6851_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_6851:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_6861_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_6861:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 26 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:ip_phone_6871_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_6871:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_7811_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_7811:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_7821_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_7821:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_7832_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_7832:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_7841_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_7841:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_7861_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_7861:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8811_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8811:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8832_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8832:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8841_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8841:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8845_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8845:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8851_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8851:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8861_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8861:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:ip_phone_8865_with_multiplatform_firmware:*:*:*:*:*:*:*:* | up to 12.0.4 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:ip_phone_8865:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:ip_phone_6871_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_6871:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_7811_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_7811:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_7821_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_7821:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_7832_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_7832:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_7841_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_7841:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_7861_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_7861:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8811_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 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_8832_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8832:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8841_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 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_8845_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8845:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8851_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8851:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8861_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8861:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:ip_phone_8865_with_multiplatform_firmware:*:*:*:*:*:*:*:* Versions up to 12.0.4 Vulnerable ·Cisco
- cpe:2.3:h:cisco:ip_phone_8865:-:*:*:*:*:*:*:* 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-2024-20376
- 2026-10-03 Alias added: GHSA-fvx9-q8pv-wxv9
References
Advisory 1
More Cisco Ip Phone 6821 With Multiplatform Firmware vulnerabilities
- TI-2024-13311 Authentication bypass in Cisco IP Phones with Multiplatform Firmware CVSS 3.1HIGH 7.5
- TI-2024-13290 Out-of-bounds write in Cisco IP Phones with Multiplatform Firmware CVSS 3.1MEDIUM 5.9
- TI-2023-06927 Cross-site request forgery in Cisco IP Phones with Multiplatform Firmware CVSS 3.1MEDIUM 6.5
- TI-2021-01106 Buffer overflow in Cisco IP Phones with Multiplatform Firmware CVSS 3.1MEDIUM 6.5
- TI-2024-13458 Cisco IP Phone 6800, 7800, 8800, and 9800 Series with Multiplatform Firmware Stored Cross-Site Scripting Vulnerability CVSS 3.1MEDIUM 4.8
- TI-2024-13457 Cisco IP Phone 6800, 7800, 8800, and 9800 Series with Multiplatform Firmware Stored Cross-Site Scripting Vulnerabilities CVSS 3.1MEDIUM 4.8
Sources
- CVE-2024-20376 · CVE Program
- CVE-2024-20376 · NVD
- FIRST EPSS
- GHSA-fvx9-q8pv-wxv9 · 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