Vulnerability Database

393,392

Total vulnerabilities in the database

CVE-2019-1752 — cisco / ios

Improper Input Validation

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.

  • Published: Mar 28, 2019
  • Updated: Oct 3, 2026
  • CVE: CVE-2019-1752
  • Severity: High
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: High
  • Score: 8.6
  • AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS v2:

  • Severity: High
  • Score: 7.8
  • AV:N/AC:L/Au:N/C:N/I:N/A:C

CWEs:

Software Affected versions
cisco / ios = 15.0(1)m
cisco / ios = 15.0(1)m1
cisco / ios = 15.0(1)m2
cisco / ios = 15.0(1)m3
cisco / ios = 15.0(1)m4
cisco / ios = 15.0(1)m5
cisco / ios = 15.0(1)m6
cisco / ios = 15.0(1)m6a
cisco / ios = 15.0(1)m7
cisco / ios = 15.0(1)m8
cisco / ios = 15.0(1)m9
cisco / ios = 15.0(1)m10
cisco / ios = 15.0(1)xa
cisco / ios = 15.0(1)xa1
cisco / ios = 15.0(1)xa2
cisco / ios = 15.0(1)xa3
cisco / ios = 15.0(1)xa4
cisco / ios = 15.0(1)xa5
cisco / ios = 15.1(1)t
cisco / ios = 15.1(1)t1
cisco / ios = 15.1(1)t2
cisco / ios = 15.1(1)t3
cisco / ios = 15.1(1)t4
cisco / ios = 15.1(1)t5
cisco / ios = 15.1(1)xb
cisco / ios = 15.1(1)xb1
cisco / ios = 15.1(1)xb2
cisco / ios = 15.1(1)xb3
cisco / ios = 15.1(2)gc
cisco / ios = 15.1(2)gc1
cisco / ios = 15.1(2)gc2
cisco / ios = 15.1(2)t
cisco / ios = 15.1(2)t0a
cisco / ios = 15.1(2)t1
cisco / ios = 15.1(2)t2
cisco / ios = 15.1(2)t2a
cisco / ios = 15.1(2)t3
cisco / ios = 15.1(2)t4
cisco / ios = 15.1(2)t5
cisco / ios = 15.1(3)t
cisco / ios = 15.1(3)t1
cisco / ios = 15.1(3)t2
cisco / ios = 15.1(3)t3
cisco / ios = 15.1(3)t4
cisco / ios = 15.1(4)gc
cisco / ios = 15.1(4)gc1
cisco / ios = 15.1(4)gc2
cisco / ios = 15.1(4)m
cisco / ios = 15.1(4)m0a
cisco / ios = 15.1(4)m0b
cisco / ios = 15.1(4)m1
cisco / ios = 15.1(4)m2
cisco / ios = 15.1(4)m3
cisco / ios = 15.1(4)m3a
cisco / ios = 15.1(4)m4
cisco / ios = 15.1(4)m5
cisco / ios = 15.1(4)m6
cisco / ios = 15.1(4)m7
cisco / ios = 15.1(4)m8
cisco / ios = 15.1(4)m9
cisco / ios = 15.1(4)m10
cisco / ios = 15.1(4)m12a
cisco / ios = 15.1(4)m12c
cisco / ios = 15.1(4)xb4
cisco / ios = 15.1(4)xb5
cisco / ios = 15.1(4)xb5a
cisco / ios = 15.1(4)xb6
cisco / ios = 15.1(4)xb7
cisco / ios = 15.1(4)xb8
cisco / ios = 15.1(4)xb8a
cisco / ios = 15.2(1)gc
cisco / ios = 15.2(1)gc1
cisco / ios = 15.2(1)gc2
cisco / ios = 15.2(2)gc
cisco / ios = 15.2(3)gc
cisco / ios = 15.2(3)gc1
cisco / ios = 15.2(4)gc
cisco / ios = 15.2(4)gc1
cisco / ios = 15.2(4)gc2
cisco / ios = 15.2(4)gc3
cisco / ios = 15.2(4)m
cisco / ios = 15.2(4)m1
cisco / ios = 15.2(4)m2
cisco / ios = 15.2(4)m3
cisco / ios = 15.2(4)m4
cisco / ios = 15.2(4)m5
cisco / ios = 15.2(4)m6
cisco / ios = 15.2(4)m6a
cisco / ios = 15.2(4)m6b
cisco / ios = 15.2(4)m7
cisco / ios = 15.2(4)m8
cisco / ios = 15.2(4)m9
cisco / ios = 15.2(4)m10
cisco / ios = 15.2(4)m11
cisco / ios = 15.3(1)t
cisco / ios = 15.3(1)t1
cisco / ios = 15.3(1)t2
cisco / ios = 15.3(1)t3
cisco / ios = 15.3(1)t4
cisco / ios = 15.3(2)t
cisco / ios = 15.3(2)t1
cisco / ios = 15.3(2)t2
cisco / ios = 15.3(2)t3
cisco / ios = 15.3(2)t4
cisco / ios = 15.3(3)m
cisco / ios = 15.3(3)m1
cisco / ios = 15.3(3)m2
cisco / ios = 15.3(3)m3
cisco / ios = 15.3(3)m4
cisco / ios = 15.3(3)m5
cisco / ios = 15.3(3)m6
cisco / ios = 15.3(3)m7
cisco / ios = 15.3(3)m8
cisco / ios = 15.3(3)m8a
cisco / ios = 15.3(3)m9
cisco / ios = 15.3(3)m10
cisco / ios = 15.3(3)xb12
cisco / ios = 15.4(1)cg
cisco / ios = 15.4(1)cg1
cisco / ios = 15.4(1)t
cisco / ios = 15.4(1)t1
cisco / ios = 15.4(1)t2
cisco / ios = 15.4(1)t3
cisco / ios = 15.4(1)t4
cisco / ios = 15.4(2)cg
cisco / ios = 15.4(2)s3
cisco / ios = 15.4(2)t
cisco / ios = 15.4(2)t1
cisco / ios = 15.4(2)t2
cisco / ios = 15.4(2)t3
cisco / ios = 15.4(2)t4
cisco / ios = 15.4(3)m
cisco / ios = 15.4(3)m1
cisco / ios = 15.4(3)m2
cisco / ios = 15.4(3)m3
cisco / ios = 15.4(3)m4
cisco / ios = 15.4(3)m5
cisco / ios = 15.4(3)m6
cisco / ios = 15.4(3)m6a
cisco / ios = 15.4(3)m7
cisco / ios = 15.4(3)m7a
cisco / ios = 15.4(3)m8
cisco / ios = 15.4(3)m9
cisco / ios = 15.4(3)m10
cisco / ios = 15.5(1)t
cisco / ios = 15.5(1)t1
cisco / ios = 15.5(1)t2
cisco / ios = 15.5(1)t3
cisco / ios = 15.5(1)t4
cisco / ios = 15.5(2)t
cisco / ios = 15.5(2)t1
cisco / ios = 15.5(2)t2
cisco / ios = 15.5(2)t3
cisco / ios = 15.5(2)t4
cisco / ios = 15.5(2)xb
cisco / ios = 15.5(3)m
cisco / ios = 15.5(3)m1
cisco / ios = 15.5(3)m2
cisco / ios = 15.5(3)m2a
cisco / ios = 15.5(3)m3
cisco / ios = 15.5(3)m4
cisco / ios = 15.5(3)m4a
cisco / ios = 15.5(3)m4b
cisco / ios = 15.5(3)m4c
cisco / ios = 15.5(3)m5
cisco / ios = 15.5(3)m5a
cisco / ios = 15.6(1)t
cisco / ios = 15.6(1)t0a
cisco / ios = 15.6(1)t1
cisco / ios = 15.6(1)t2
cisco / ios = 15.6(1)t3
cisco / ios = 15.6(2)t
cisco / ios = 15.6(2)t1
cisco / ios = 15.6(2)t2
cisco / ios = 15.6(2)t3
cisco / ios = 15.6(3)m
cisco / ios = 15.6(3)m0a
cisco / ios = 15.6(3)m1
cisco / ios = 15.6(3)m1a
cisco / ios = 15.6(3)m1b
cisco / ios = 15.6(3)m2
cisco / ios = 15.6(3)m2a
cisco / ios = 15.6(3)m3
cisco / ios = 15.6(3)m3a
cisco / ios = 15.6(3)m4
cisco / ios = 15.6(3)m5
cisco / ios = 15.7(3)m
cisco / ios = 15.7(3)m0a
cisco / ios = 15.7(3)m1
cisco / ios = 15.7(3)m2
cisco / ios = 15.7(3)m3
cisco / ios = 15.8(3)m
cisco / ios = 15.8(3)m0a
cisco / ios_xe = 3.8.0s
cisco / ios_xe = 3.8.1s
cisco / ios_xe = 3.8.2s
cisco / ios_xe = 3.9.0as
cisco / ios_xe = 3.9.0s
cisco / ios_xe = 3.9.1as
cisco / ios_xe = 3.9.1s
cisco / ios_xe = 3.9.2s
cisco / ios_xe = 3.10.0s
cisco / ios_xe = 3.10.1s
cisco / ios_xe = 3.10.2as
cisco / ios_xe = 3.10.2s
cisco / ios_xe = 3.10.2ts
cisco / ios_xe = 3.10.3s
cisco / ios_xe = 3.10.4s
cisco / ios_xe = 3.10.5s
cisco / ios_xe = 3.10.6s
cisco / ios_xe = 3.10.7s
cisco / ios_xe = 3.10.8as
cisco / ios_xe = 3.10.8s
cisco / ios_xe = 3.10.9s
cisco / ios_xe = 3.10.10s
cisco / ios_xe = 3.11.0s
cisco / ios_xe = 3.11.1s
cisco / ios_xe = 3.11.2s
cisco / ios_xe = 3.11.3s
cisco / ios_xe = 3.11.4s
cisco / ios_xe = 3.12.0as
cisco / ios_xe = 3.12.0s
cisco / ios_xe = 3.12.1s
cisco / ios_xe = 3.12.2s
cisco / ios_xe = 3.12.3s
cisco / ios_xe = 3.12.4s
cisco / ios_xe = 3.13.0s
cisco / ios_xe = 3.13.1s
cisco / ios_xe = 3.13.2as
cisco / ios_xe = 3.13.2s
cisco / ios_xe = 3.13.3s
cisco / ios_xe = 3.13.4s
cisco / ios_xe = 3.13.5as
cisco / ios_xe = 3.13.5s
cisco / ios_xe = 3.13.6as
cisco / ios_xe = 3.13.6bs
cisco / ios_xe = 3.13.6s
cisco / ios_xe = 3.13.7as
cisco / ios_xe = 3.13.7s
cisco / ios_xe = 3.13.8s
cisco / ios_xe = 3.13.9s
cisco / ios_xe = 3.13.10s
cisco / ios_xe = 3.14.0s
cisco / ios_xe = 3.14.1s
cisco / ios_xe = 3.14.2s
cisco / ios_xe = 3.14.3s
cisco / ios_xe = 3.14.4s
cisco / ios_xe = 3.15.0s
cisco / ios_xe = 3.15.1cs
cisco / ios_xe = 3.15.1s
cisco / ios_xe = 3.15.2s
cisco / ios_xe = 3.15.3s
cisco / ios_xe = 3.15.4s
cisco / ios_xe = 3.16.0bs
cisco / ios_xe = 3.16.0cs
cisco / ios_xe = 3.16.0s
cisco / ios_xe = 3.16.1as
cisco / ios_xe = 3.16.1s
cisco / ios_xe = 3.16.2bs
cisco / ios_xe = 3.16.2s
cisco / ios_xe = 3.16.3s
cisco / ios_xe = 3.16.4as
cisco / ios_xe = 3.16.4bs
cisco / ios_xe = 3.16.4cs
cisco / ios_xe = 3.16.4ds
cisco / ios_xe = 3.16.4es
cisco / ios_xe = 3.16.4gs
cisco / ios_xe = 3.16.5as
cisco / ios_xe = 3.16.5bs
cisco / ios_xe = 3.16.5s
cisco / ios_xe = 3.16.6bs
cisco / ios_xe = 3.16.6s
cisco / ios_xe = 3.16.7as
cisco / ios_xe = 3.16.7bs
cisco / ios_xe = 3.16.7s
cisco / ios_xe = 3.16.8s
cisco / ios_xe = 3.17.0s
cisco / ios_xe = 3.17.1as
cisco / ios_xe = 3.17.1s
cisco / ios_xe = 3.17.3s
cisco / ios_xe = 3.17.4s
cisco / ios_xe = 3.18.0as
cisco / ios_xe = 3.18.0sp
cisco / ios_xe = 3.18.1asp
cisco / ios_xe = 3.18.1s
cisco / ios_xe = 3.18.1sp
cisco / ios_xe = 3.18.2asp
cisco / ios_xe = 3.18.3asp
cisco / ios_xe = 3.18.3bsp
cisco / ios_xe = 3.18.3sp
cisco / ios_xe = 3.18.4sp
cisco / ios_xe = 3.18.5sp
cisco / ios_xe = 16.2.1
cisco / ios_xe = 16.2.2
cisco / ios_xe = 16.3.1
cisco / ios_xe = 16.3.1a
cisco / ios_xe = 16.3.2
cisco / ios_xe = 16.3.3
cisco / ios_xe = 16.3.4
cisco / ios_xe = 16.3.5
cisco / ios_xe = 16.3.6
cisco / ios_xe = 16.3.7
cisco / ios_xe = 16.4.1
cisco / ios_xe = 16.4.2
cisco / ios_xe = 16.4.3
cisco / ios_xe = 16.5.1
cisco / ios_xe = 16.5.1b
cisco / ios_xe = 16.5.2
cisco / ios_xe = 16.5.3
cisco / ios_xe = 16.6.1
cisco / ios_xe = 16.6.2
cisco / ios_xe = 16.6.3
cisco / ios_xe = 16.6.4
cisco / ios_xe = 16.6.4s
cisco / ios_xe = 16.7.1
cisco / ios_xe = 16.7.1a
cisco / ios_xe = 16.7.1b
cisco / ios_xe = 16.7.2
cisco / ios_xe = 16.7.3
cisco / ios_xe = 16.8.1
cisco / ios_xe = 16.8.1d
cisco / ios_xe = 16.8.1s

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.