What’s Vulnerable › Vulnerabilities

CVE-2019-1752: Cisco IOS and IOS XE Software ISDN Interface Denial of Service Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-03-28 · updated 2026-06-17
• Weakness: CWE-20

Description

A vulnerability in the ISDN functions of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload. The vulnerability is due to incorrect processing of specific values in the Q.931 information elements. An attacker could exploit this vulnerability by calling the affected device with specific Q.931 information elements being present. An exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device.

Affected products

• Cisco IOS: 15.0(1)m, 15.0(1)m1, 15.0(1)m2, 15.0(1)m3, 15.0(1)m4, 15.0(1)m5 (+187)
• Cisco IOS XE: 3.8.0s, 3.8.1s, 3.8.2s, 3.9.0as, 3.9.0s, 3.9.1as (+123)

References

• http://www.securityfocus.com/bid/107589
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-isdn
• http://www.securityfocus.com/bid/107589
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-isdn

Get alerted when CVE-2019-1752 or the next vulnerability affects your stack