Vulnerability Database

346,508

Total vulnerabilities in the database

CVE-2019-1752 — cisco / ios_xe

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: Nov 9, 2025
  • CVE: CVE-2019-1752
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/PR:N/UI:N/S:U/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 From Fixed in
cisco / ios_xe 3.13.2s 3.13.2s.x
cisco / ios_xe 3.10.6s 3.10.6s.x
cisco / ios_xe 3.13.6s 3.13.6s.x
cisco / ios 15.5(1)t1 15.5(1)t1.x
cisco / ios 15.0(1)xa 15.0(1)xa.x
cisco / ios_xe 3.14.4s 3.14.4s.x
cisco / ios_xe 3.15.1cs 3.15.1cs.x
cisco / ios 15.6(2)t3 15.6(2)t3.x
cisco / ios 15.6(1)t2 15.6(1)t2.x
cisco / ios_xe 3.13.4s 3.13.4s.x
cisco / ios 15.2(2)gc 15.2(2)gc.x
cisco / ios 15.2(4)m7 15.2(4)m7.x
cisco / ios 15.1(4)gc 15.1(4)gc.x
cisco / ios 15.0(1)xa2 15.0(1)xa2.x
cisco / ios 15.5(3)m4a 15.5(3)m4a.x
cisco / ios_xe 16.2.1 16.2.1.x
cisco / ios 15.1(3)t2 15.1(3)t2.x
cisco / ios 15.5(1)t3 15.5(1)t3.x
cisco / ios 15.1(2)t0a 15.1(2)t0a.x
cisco / ios 15.1(1)t 15.1(1)t.x
cisco / ios_xe 3.13.0s 3.13.0s.x
cisco / ios 15.1(1)t4 15.1(1)t4.x
cisco / ios 15.1(1)t5 15.1(1)t5.x
cisco / ios 15.3(2)t2 15.3(2)t2.x
cisco / ios 15.3(1)t4 15.3(1)t4.x
cisco / ios 15.3(2)t 15.3(2)t.x
cisco / ios 15.6(2)t1 15.6(2)t1.x
cisco / ios 15.0(1)m8 15.0(1)m8.x
cisco / ios_xe 3.8.0s 3.8.0s.x
cisco / ios_xe 3.17.3s 3.17.3s.x
cisco / ios_xe 3.16.0s 3.16.0s.x
cisco / ios_xe 3.8.1s 3.8.1s.x
cisco / ios_xe 3.14.1s 3.14.1s.x
cisco / ios 15.4(3)m2 15.4(3)m2.x
cisco / ios_xe 3.12.2s 3.12.2s.x
cisco / ios 15.1(4)m8 15.1(4)m8.x
cisco / ios 15.6(3)m1 15.6(3)m1.x
cisco / ios 15.4(2)t1 15.4(2)t1.x
cisco / ios 15.0(1)m6 15.0(1)m6.x
cisco / ios 15.4(1)t2 15.4(1)t2.x
cisco / ios 15.6(3)m3 15.6(3)m3.x
cisco / ios_xe 3.10.5s 3.10.5s.x
cisco / ios_xe 3.10.8s 3.10.8s.x
cisco / ios_xe 3.9.0as 3.9.0as.x
cisco / ios 15.1(2)gc2 15.1(2)gc2.x
cisco / ios_xe 3.9.1as 3.9.1as.x
cisco / ios 15.5(2)t 15.5(2)t.x
cisco / ios_xe 3.10.1s 3.10.1s.x
cisco / ios 15.0(1)xa3 15.0(1)xa3.x
cisco / ios 15.1(4)gc2 15.1(4)gc2.x
cisco / ios_xe 3.9.0s 3.9.0s.x
cisco / ios 15.0(1)m4 15.0(1)m4.x
cisco / ios 15.1(2)gc 15.1(2)gc.x
cisco / ios_xe 3.17.1as 3.17.1as.x
cisco / ios_xe 3.10.2s 3.10.2s.x
cisco / ios 15.2(4)m4 15.2(4)m4.x
cisco / ios 15.2(4)m2 15.2(4)m2.x
cisco / ios 15.2(4)gc1 15.2(4)gc1.x
cisco / ios_xe 3.18.2asp 3.18.2asp.x
cisco / ios 15.4(2)t2 15.4(2)t2.x
cisco / ios 15.3(3)m5 15.3(3)m5.x
cisco / ios 15.3(3)m8 15.3(3)m8.x
cisco / ios 15.5(3)m3 15.5(3)m3.x
cisco / ios_xe 3.18.0as 3.18.0as.x
cisco / ios 15.7(3)m 15.7(3)m.x
cisco / ios 15.5(3)m2 15.5(3)m2.x
cisco / ios 15.6(3)m2a 15.6(3)m2a.x
cisco / ios 15.5(2)t3 15.5(2)t3.x
cisco / ios_xe 3.16.2s 3.16.2s.x
cisco / ios 15.0(1)m7 15.0(1)m7.x
cisco / ios_xe 3.9.2s 3.9.2s.x
cisco / ios_xe 3.16.0cs 3.16.0cs.x
cisco / ios 15.1(1)xb 15.1(1)xb.x
cisco / ios_xe 3.13.5s 3.13.5s.x
cisco / ios 15.1(4)m5 15.1(4)m5.x
cisco / ios 15.0(1)m 15.0(1)m.x
cisco / ios 15.1(3)t4 15.1(3)t4.x
cisco / ios 15.1(4)m2 15.1(4)m2.x
cisco / ios 15.4(3)m3 15.4(3)m3.x
cisco / ios_xe 3.11.2s 3.11.2s.x
cisco / ios_xe 3.15.0s 3.15.0s.x
cisco / ios_xe 3.13.5as 3.13.5as.x
cisco / ios 15.2(4)m5 15.2(4)m5.x
cisco / ios_xe 3.14.3s 3.14.3s.x
cisco / ios 15.0(1)m2 15.0(1)m2.x
cisco / ios 15.4(2)t3 15.4(2)t3.x
cisco / ios_xe 3.18.3sp 3.18.3sp.x
cisco / ios 15.5(3)m 15.5(3)m.x
cisco / ios_xe 16.6.1 16.6.1.x
cisco / ios_xe 3.18.1sp 3.18.1sp.x
cisco / ios 15.1(1)t2 15.1(1)t2.x
cisco / ios 15.2(4)gc 15.2(4)gc.x
cisco / ios_xe 3.17.4s 3.17.4s.x
cisco / ios 15.3(1)t 15.3(1)t.x
cisco / ios 15.2(4)gc3 15.2(4)gc3.x
cisco / ios 15.6(2)t2 15.6(2)t2.x
cisco / ios 15.2(4)m8 15.2(4)m8.x
cisco / ios_xe 3.11.3s 3.11.3s.x
cisco / ios_xe 3.15.3s 3.15.3s.x
cisco / ios 15.3(3)m8a 15.3(3)m8a.x
cisco / ios 15.4(1)t3 15.4(1)t3.x
cisco / ios_xe 3.10.2ts 3.10.2ts.x
cisco / ios_xe 3.10.3s 3.10.3s.x
cisco / ios 15.3(3)m 15.3(3)m.x
cisco / ios_xe 3.16.6s 3.16.6s.x
cisco / ios_xe 3.14.0s 3.14.0s.x
cisco / ios 15.3(3)m9 15.3(3)m9.x
cisco / ios 15.3(3)m2 15.3(3)m2.x
cisco / ios 15.5(3)m1 15.5(3)m1.x
cisco / ios_xe 3.16.5s 3.16.5s.x
cisco / ios 15.4(2)cg 15.4(2)cg.x
cisco / ios_xe 3.10.7s 3.10.7s.x
cisco / ios_xe 3.16.1s 3.16.1s.x
cisco / ios_xe 3.13.7as 3.13.7as.x
cisco / ios 15.2(1)gc1 15.2(1)gc1.x
cisco / ios 15.0(1)xa1 15.0(1)xa1.x
cisco / ios 15.1(4)m3a 15.1(4)m3a.x
cisco / ios 15.1(1)t1 15.1(1)t1.x
cisco / ios_xe 3.11.0s 3.11.0s.x
cisco / ios_xe 3.12.0as 3.12.0as.x
cisco / ios_xe 3.9.1s 3.9.1s.x
cisco / ios 15.3(3)m3 15.3(3)m3.x
cisco / ios 15.1(2)t5 15.1(2)t5.x
cisco / ios 15.5(1)t4 15.5(1)t4.x
cisco / ios 15.2(4)m1 15.2(4)m1.x
cisco / ios 15.2(4)m6a 15.2(4)m6a.x
cisco / ios 15.4(1)t 15.4(1)t.x
cisco / ios 15.1(4)m7 15.1(4)m7.x
cisco / ios 15.0(1)m1 15.0(1)m1.x
cisco / ios 15.4(2)t 15.4(2)t.x
cisco / ios 15.2(4)m10 15.2(4)m10.x
cisco / ios 15.5(2)t2 15.5(2)t2.x
cisco / ios 15.1(2)gc1 15.1(2)gc1.x
cisco / ios_xe 3.15.1s 3.15.1s.x
cisco / ios 15.5(1)t 15.5(1)t.x
cisco / ios 15.0(1)xa5 15.0(1)xa5.x
cisco / ios 15.4(1)t1 15.4(1)t1.x
cisco / ios 15.1(3)t1 15.1(3)t1.x
cisco / ios 15.2(3)gc1 15.2(3)gc1.x
cisco / ios 15.6(1)t1 15.6(1)t1.x
cisco / ios 15.1(4)m4 15.1(4)m4.x
cisco / ios 15.6(3)m1b 15.6(3)m1b.x
cisco / ios 15.1(2)t2 15.1(2)t2.x
cisco / ios 15.1(2)t2a 15.1(2)t2a.x
cisco / ios 15.3(3)m7 15.3(3)m7.x
cisco / ios 15.1(3)t 15.1(3)t.x
cisco / ios 15.1(4)m1 15.1(4)m1.x
cisco / ios 15.1(4)gc1 15.1(4)gc1.x
cisco / ios 15.3(1)t3 15.3(1)t3.x
cisco / ios 15.6(3)m 15.6(3)m.x
cisco / ios 15.2(4)m 15.2(4)m.x
cisco / ios 15.4(3)m5 15.4(3)m5.x
cisco / ios_xe 3.10.0s 3.10.0s.x
cisco / ios 15.4(3)m4 15.4(3)m4.x
cisco / ios 15.4(1)cg 15.4(1)cg.x
cisco / ios_xe 3.8.2s 3.8.2s.x
cisco / ios_xe 3.17.0s 3.17.0s.x
cisco / ios_xe 3.16.4ds 3.16.4ds.x
cisco / ios 15.6(2)t 15.6(2)t.x
cisco / ios 15.6(3)m0a 15.6(3)m0a.x
cisco / ios 15.3(3)m6 15.3(3)m6.x
cisco / ios 15.1(2)t1 15.1(2)t1.x
cisco / ios 15.5(2)t4 15.5(2)t4.x
cisco / ios 15.1(3)t3 15.1(3)t3.x
cisco / ios 15.0(1)m9 15.0(1)m9.x
cisco / ios 15.6(1)t0a 15.6(1)t0a.x
cisco / ios 15.0(1)m10 15.0(1)m10.x
cisco / ios_xe 3.16.3s 3.16.3s.x
cisco / ios 15.1(2)t 15.1(2)t.x
cisco / ios 15.3(1)t1 15.3(1)t1.x
cisco / ios 15.3(3)m4 15.3(3)m4.x
cisco / ios_xe 3.17.1s 3.17.1s.x
cisco / ios 15.2(1)gc 15.2(1)gc.x
cisco / ios_xe 3.15.2s 3.15.2s.x
cisco / ios_xe 3.10.8as 3.10.8as.x
cisco / ios_xe 16.4.1 16.4.1.x
cisco / ios_xe 3.14.2s 3.14.2s.x
cisco / ios_xe 3.15.4s 3.15.4s.x
cisco / ios 15.1(2)t3 15.1(2)t3.x
cisco / ios 15.3(3)m1 15.3(3)m1.x
cisco / ios 15.5(1)t2 15.5(1)t2.x
cisco / ios_xe 3.16.2bs 3.16.2bs.x
cisco / ios_xe 3.16.1as 3.16.1as.x
cisco / ios_xe 3.18.1s 3.18.1s.x
cisco / ios 15.0(1)m5 15.0(1)m5.x
cisco / ios_xe 3.12.0s 3.12.0s.x
cisco / ios 15.1(1)xb1 15.1(1)xb1.x
cisco / ios_xe 3.12.1s 3.12.1s.x
cisco / ios 15.5(2)t1 15.5(2)t1.x
cisco / ios_xe 3.12.4s 3.12.4s.x
cisco / ios_xe 16.2.2 16.2.2.x
cisco / ios 15.6(3)m2 15.6(3)m2.x
cisco / ios 15.3(2)t4 15.3(2)t4.x
cisco / ios_xe 3.18.0sp 3.18.0sp.x
cisco / ios 15.5(3)m4 15.5(3)m4.x
cisco / ios 15.1(1)t3 15.1(1)t3.x
cisco / ios_xe 3.16.4as 3.16.4as.x
cisco / ios 15.3(1)t2 15.3(1)t2.x
cisco / ios_xe 3.13.3s 3.13.3s.x
cisco / ios 15.2(4)m11 15.2(4)m11.x
cisco / ios 15.1(4)m12a 15.1(4)m12a.x
cisco / ios 15.0(1)m3 15.0(1)m3.x
cisco / ios 15.2(4)m6 15.2(4)m6.x
cisco / ios_xe 3.13.6as 3.13.6as.x
cisco / ios 15.5(3)m5 15.5(3)m5.x
cisco / ios_xe 3.16.4bs 3.16.4bs.x
cisco / ios_xe 3.13.2as 3.13.2as.x
cisco / ios 15.2(4)m3 15.2(4)m3.x
cisco / ios 15.4(3)m1 15.4(3)m1.x
cisco / ios 15.4(1)t4 15.4(1)t4.x
cisco / ios 15.3(2)t3 15.3(2)t3.x
cisco / ios 15.1(4)m 15.1(4)m.x
cisco / ios 15.1(2)t4 15.1(2)t4.x
cisco / ios_xe 3.11.4s 3.11.4s.x
cisco / ios 15.4(3)m6a 15.4(3)m6a.x
cisco / ios 15.1(4)m9 15.1(4)m9.x
cisco / ios 15.2(4)gc2 15.2(4)gc2.x
cisco / ios_xe 3.12.3s 3.12.3s.x
cisco / ios_xe 16.3.1 16.3.1.x
cisco / ios 15.1(4)m6 15.1(4)m6.x
cisco / ios 15.4(1)cg1 15.4(1)cg1.x
cisco / ios 15.2(4)m9 15.2(4)m9.x
cisco / ios 15.4(2)s3 15.4(2)s3.x
cisco / ios 15.2(3)gc 15.2(3)gc.x
cisco / ios_xe 3.13.1s 3.13.1s.x
cisco / ios 15.4(3)m6 15.4(3)m6.x
cisco / ios_xe 3.10.4s 3.10.4s.x
cisco / ios 15.1(4)m3 15.1(4)m3.x
cisco / ios 15.4(3)m 15.4(3)m.x
cisco / ios 15.4(3)m7 15.4(3)m7.x
cisco / ios 15.1(4)m10 15.1(4)m10.x
cisco / ios_xe 3.18.1asp 3.18.1asp.x
cisco / ios 15.0(1)xa4 15.0(1)xa4.x
cisco / ios_xe 3.11.1s 3.11.1s.x
cisco / ios 15.3(2)t1 15.3(2)t1.x
cisco / ios 15.2(1)gc2 15.2(1)gc2.x
cisco / ios_xe 3.13.8s 3.13.8s.x
cisco / ios 15.4(2)t4 15.4(2)t4.x
cisco / ios 15.6(1)t 15.6(1)t.x
cisco / ios_xe 16.3.1a 16.3.1a.x
cisco / ios_xe 16.3.2 16.3.2.x
cisco / ios_xe 16.3.3 16.3.3.x
cisco / ios 15.6(1)t3 15.6(1)t3.x
cisco / ios_xe 3.16.6bs 3.16.6bs.x
cisco / ios_xe 16.5.1 16.5.1.x
cisco / ios_xe 3.13.7s 3.13.7s.x
cisco / ios_xe 3.10.9s 3.10.9s.x
cisco / ios_xe 16.3.4 16.3.4.x
cisco / ios_xe 16.5.1b 16.5.1b.x
cisco / ios_xe 16.4.2 16.4.2.x
cisco / ios_xe 3.13.9s 3.13.9s.x
cisco / ios_xe 16.3.6 16.3.6.x
cisco / ios_xe 16.6.3 16.6.3.x
cisco / ios 15.4(3)m7a 15.4(3)m7a.x
cisco / ios 15.4(3)m8 15.4(3)m8.x
cisco / ios 15.5(3)m4b 15.5(3)m4b.x
cisco / ios 15.5(3)m4c 15.5(3)m4c.x
cisco / ios 15.5(3)m5a 15.5(3)m5a.x
cisco / ios 15.6(3)m1a 15.6(3)m1a.x
cisco / ios 15.6(3)m3a 15.6(3)m3a.x
cisco / ios 15.7(3)m0a 15.7(3)m0a.x
cisco / ios 15.7(3)m1 15.7(3)m1.x
cisco / ios 15.7(3)m2 15.7(3)m2.x
cisco / ios_xe 16.8.1 16.8.1.x
cisco / ios_xe 16.7.1 16.7.1.x
cisco / ios_xe 16.6.2 16.6.2.x
cisco / ios_xe 3.16.4gs 3.16.4gs.x
cisco / ios_xe 3.16.4cs 3.16.4cs.x
cisco / ios_xe 3.16.5bs 3.16.5bs.x
cisco / ios_xe 3.16.4es 3.16.4es.x
cisco / ios_xe 16.3.5 16.3.5.x
cisco / ios_xe 16.5.2 16.5.2.x
cisco / ios_xe 3.16.5as 3.16.5as.x
cisco / ios_xe 3.16.0bs 3.16.0bs.x
cisco / ios 15.1(4)m12c 15.1(4)m12c.x
cisco / ios_xe 16.8.1s 16.8.1s.x
cisco / ios_xe 16.7.2 16.7.2.x
cisco / ios_xe 16.8.1d 16.8.1d.x
cisco / ios_xe 16.7.3 16.7.3.x
cisco / ios_xe 16.7.1a 16.7.1a.x
cisco / ios_xe 16.7.1b 16.7.1b.x
cisco / ios_xe 16.4.3 16.4.3.x
cisco / ios 15.6(3)m4 15.6(3)m4.x
cisco / ios_xe 3.18.3asp 3.18.3asp.x
cisco / ios_xe 3.16.7as 3.16.7as.x
cisco / ios_xe 3.16.7s 3.16.7s.x
cisco / ios_xe 3.18.3bsp 3.18.3bsp.x
cisco / ios_xe 3.16.7bs 3.16.7bs.x
cisco / ios_xe 3.18.4sp 3.18.4sp.x
cisco / ios_xe 16.5.3 16.5.3.x
cisco / ios_xe 16.3.7 16.3.7.x
cisco / ios 15.2(4)m6b 15.2(4)m6b.x
cisco / ios 15.1(1)xb3 15.1(1)xb3.x
cisco / ios 15.4(3)m10 15.4(3)m10.x
cisco / ios_xe 3.13.10s 3.13.10s.x
cisco / ios 15.1(4)xb7 15.1(4)xb7.x
cisco / ios 15.7(3)m3 15.7(3)m3.x
cisco / ios_xe 3.10.2as 3.10.2as.x
cisco / ios_xe 3.13.6bs 3.13.6bs.x
cisco / ios 15.1(1)xb2 15.1(1)xb2.x
cisco / ios_xe 16.6.4s 16.6.4s.x
cisco / ios 15.6(3)m5 15.6(3)m5.x
cisco / ios 15.5(2)xb 15.5(2)xb.x
cisco / ios 15.1(4)xb6 15.1(4)xb6.x
cisco / ios 15.8(3)m0a 15.8(3)m0a.x
cisco / ios 15.3(3)xb12 15.3(3)xb12.x
cisco / ios 15.1(4)xb8a 15.1(4)xb8a.x
cisco / ios 15.1(4)xb8 15.1(4)xb8.x
cisco / ios 15.1(4)xb4 15.1(4)xb4.x
cisco / ios 15.1(4)xb5 15.1(4)xb5.x
cisco / ios 15.4(3)m9 15.4(3)m9.x
cisco / ios_xe 3.10.10s 3.10.10s.x
cisco / ios 15.3(3)m10 15.3(3)m10.x
cisco / ios_xe 16.6.4 16.6.4.x
cisco / ios 15.5(3)m2a 15.5(3)m2a.x
cisco / ios 15.1(4)m0a 15.1(4)m0a.x
cisco / ios_xe 3.18.5sp 3.18.5sp.x
cisco / ios_xe 3.16.8s 3.16.8s.x
cisco / ios 15.0(1)m6a 15.0(1)m6a.x
cisco / ios 15.1(4)m0b 15.1(4)m0b.x
cisco / ios 15.1(4)xb5a 15.1(4)xb5a.x
cisco / ios 15.8(3)m 15.8(3)m.x

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.