Buffer overflow in Cisco Small Business IP Phones
Priority LOW 34CWE-120Published · 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-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 cause an affected device to reload unexpectedly. These vulnerabilities exist because HTTP packets are not properly checked for errors. An attacker could exploit this vulnerability by sending a crafted HTTP packet to the remote interface of an affected device. A successful exploit could allow the attacker to cause a DoS condition on the device.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00753 55th 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
- No
- 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 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-2024-20451
- 2026-10-03 Alias added: GHSA-3gj8-mpqg-gqrv
References
Advisory 1
More Cisco Spa 301 Firmware vulnerabilities
- TI-2024-13377 Buffer overflow in Cisco Small Business IP Phones CVSS 3.1CRITICAL 9.8
- 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
Sources
- CVE-2024-20451 · CVE Program
- CVE-2024-20451 · NVD
- FIRST EPSS
- GHSA-3gj8-mpqg-gqrv · 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