CVE-2024-20451

Name: CVE-2024-20451
Creator: NVD / NIST
Published: 2024-08-07T17:15:50.493+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.75%

Last modified Jun 17, 2026

CVE-2024-20451 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.75% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.75%

50.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Cisco	Spa 301 Firmware	All versions
Cisco	Spa 303 Firmware	All versions
Cisco	Spa 501g Firmware	All versions
Cisco	Spa 502g Firmware	All versions
Cisco	Spa 504g Firmware	All versions
Cisco	Spa 508g Firmware	All versions
Cisco	Spa 509g Firmware	All versions
Cisco	Spa 512g Firmware	All versions
Cisco	Spa 514g Firmware	All versions
Cisco	Spa 525g Firmware	All versions
Cisco	Spa 525g2 Firmware	All versions

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-spa-http-vulns-RJZmX2XzVendor Advisory

Timeline

Published: Aug 7, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-20451?

How severe is CVE-2024-20451?

CVE-2024-20451 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.75% probability of exploitation in the next 30 days.

How do I fix CVE-2024-20451?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-20451?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST