Buffer overflow in Cisco Small Business IP Phones
Priority MEDIUM 59CWE-120Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.
Summary
Multiple vulnerabilities in the web-based management interface of Cisco Small Business SPA300 Series IP Phones and Cisco Small Business SPA500 Series IP Phones could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system with root privileges. These vulnerabilities exist because incoming HTTP packets are not properly checked for errors, which could result in a buffer overflow. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to overflow an internal buffer and execute arbitrary commands at the root privilege level.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.07225 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
- Total
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 Small Business IP Phones | 7.6.0; 7.6.2; 7.6.2SR3; 7.6.2SR6; 7.6.2SR2; 7.6.2SR4; 7.6.2SR1; 7.6.2SR5; 7.6.2SR7; 7.6.1; 7.3.7; 7.5.5; 7.5.6(XU); 7.5.2; 7.5.2a; 7.5.7; 7.5.3; 7.5.6; 7.5.2b; 7.5.6c; 7.5.6a; 7.5.7s; 7.5.1; 7.5.5a; 7.5.5b; 7.5.4; 7.4.7; 7.4.4; 7.4.8; 7.4.3; 7.4.9; 7.4.6; 1.0.17 | — | No fix listed | CNA |
- Cisco Small Business IP Phones VendorCisco Affected 7.6.0; 7.6.2; 7.6.2SR3; 7.6.2SR6; 7.6.2SR2; 7.6.2SR4; 7.6.2SR1; 7.6.2SR5; 7.6.2SR7; 7.6.1; 7.3.7; 7.5.5; 7.5.6(XU); 7.5.2; 7.5.2a; 7.5.7; 7.5.3; 7.5.6; 7.5.2b; 7.5.6c; 7.5.6a; 7.5.7s; 7.5.1; 7.5.5a; 7.5.5b; 7.5.4; 7.4.7; 7.4.4; 7.4.8; 7.4.3; 7.4.9; 7.4.6; 1.0.17 Fixed in — No fix listed CNA
CPE configurations NVD · 22
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:spa_301_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Cisco |
| cpe:2.3:h:cisco:spa_301_1_line_ip_phone:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:spa_303_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Cisco |
| cpe:2.3:h:cisco:spa_303_3_line_ip_phone:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:spa_501g_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Cisco |
| cpe:2.3:h:cisco:spa_501g_8-line_ip_phone:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:spa_502g_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Cisco |
| cpe:2.3:h:cisco:spa_502g_1-line_ip_phone:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:spa_504g_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Cisco |
| cpe:2.3:h:cisco:spa_504g_4-line_ip_phone:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:spa_301_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco
- cpe:2.3:h:cisco:spa_301_1_line_ip_phone:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:spa_303_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco
- cpe:2.3:h:cisco:spa_303_3_line_ip_phone:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:spa_501g_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco
- cpe:2.3:h:cisco:spa_501g_8-line_ip_phone:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:spa_502g_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco
- cpe:2.3:h:cisco:spa_502g_1-line_ip_phone:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:spa_504g_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco
- cpe:2.3:h:cisco:spa_504g_4-line_ip_phone:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 12 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:spa_508g_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Cisco |
| cpe:2.3:h:cisco:spa_508g_8-line_ip_phone:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:spa_509g_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Cisco |
| cpe:2.3:h:cisco:spa_509g_12-line_ip_phone:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:spa_512g_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Cisco |
| cpe:2.3:h:cisco:spa_512g_1-line_ip_phone:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:spa_514g_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Cisco |
| cpe:2.3:h:cisco:spa_514g_4-line_ip_phone:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:spa_525g_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Cisco |
| cpe:2.3:h:cisco:spa_525g_5-line_ip_phone:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:spa_525g2_firmware:*:*:*:*:*:*:*:* | all versions | Vulnerable | Cisco |
| cpe:2.3:h:cisco:spa_525g2_5-line_ip_phone:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:spa_508g_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco
- cpe:2.3:h:cisco:spa_508g_8-line_ip_phone:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:spa_509g_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco
- cpe:2.3:h:cisco:spa_509g_12-line_ip_phone:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:spa_512g_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco
- cpe:2.3:h:cisco:spa_512g_1-line_ip_phone:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:spa_514g_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco
- cpe:2.3:h:cisco:spa_514g_4-line_ip_phone:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:spa_525g_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco
- cpe:2.3:h:cisco:spa_525g_5-line_ip_phone:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:spa_525g2_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Cisco
- cpe:2.3:h:cisco:spa_525g2_5-line_ip_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-2024-20450
- 2026-10-03 Alias added: GHSA-63v5-86j4-m83w
References
Advisory 1
More Cisco Spa 301 Firmware vulnerabilities
- TI-2024-13379 Buffer overflow in Cisco Small Business IP Phones CVSS 3.1CRITICAL 9.8
- TI-2017-08998 Resource management flaw in Cisco Small Business SPA300, SPA500, and SPA51x Series IP… CVSS 3.0HIGH 7.5
- TI-2024-13378 Buffer overflow in Cisco Small Business IP Phones CVSS 3.1HIGH 7.5
Sources
- CVE-2024-20450 · CVE Program
- CVE-2024-20450 · NVD
- FIRST EPSS
- GHSA-63v5-86j4-m83w · 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