CVE-2018-0421

Name: CVE-2018-0421
Creator: NVD / NIST
Published: 2018-10-05T14:29:00.623+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.48%

Last modified Jun 17, 2026

CVE-2018-0421 is a vulnerability of currently unknown severity. A vulnerability in TCP connection management in Cisco Prime Access Registrar could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition when the application unexpectedly restarts. The vulnerability is due to incorrect handling of incoming TCP SYN packets to specific listening ports. EPSS estimates a 3.48% chance of exploitation in the next 30 days.

Description

A vulnerability in TCP connection management in Cisco Prime Access Registrar could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition when the application unexpectedly restarts. The vulnerability is due to incorrect handling of incoming TCP SYN packets to specific listening ports. The improper handling of the TCP SYN packets could cause a system file description to be allocated and not freed. An attacker could exploit this vulnerability by sending a crafted stream of TCP SYN packets to the application. A successful exploit could allow the attacker to cause the application to eventually restart if a file description cannot be obtained.

Metrics

EPSS Probability

3.48%

87.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Prime Access Registrar	>= 7.3, < 7.3.0.4
Cisco	Prime Access Registrar	>= 8.0, < 8.0.1.1
Cisco	Prime Access Registrar Jumpstart	>= 7.3, < 7.3.0.4
Cisco	Prime Access Registrar Jumpstart	>= 8.0, < 8.0.1.1

References

http://www.securityfocus.com/bid/105282Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041684Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180905-cpar-dosVendor Advisory
http://www.securityfocus.com/bid/105282Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041684Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180905-cpar-dosVendor Advisory

Timeline

Published: Oct 5, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-0421?

How severe is CVE-2018-0421?

Severity scoring for CVE-2018-0421 is pending analysis. The EPSS model estimates a 3.48% probability of exploitation in the next 30 days.

How do I fix CVE-2018-0421?

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-2018-0421?

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

Scan your code now

Source: NVD / NIST