Vulnerability Database

393,544

Total vulnerabilities in the database

CVE-2016-6386 — cisco / ios_xe

Resource Management Errors

Cisco IOS XE 3.1 through 3.17 and 16.1 on 64-bit platforms allows remote attackers to cause a denial of service (data-structure corruption and device reload) via fragmented IPv4 packets, aka Bug ID CSCux66005.

  • Published: Oct 5, 2016
  • Updated: Oct 4, 2026
  • CVE: CVE-2016-6386
  • Severity: High
  • Exploit:
  • CISA KEV:

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_xe = 3.1.0s
cisco / ios_xe = 3.1.0sg
cisco / ios_xe = 3.1.1s
cisco / ios_xe = 3.1.1sg
cisco / ios_xe = 3.1.2s
cisco / ios_xe = 3.1.3as
cisco / ios_xe = 3.1.4as
cisco / ios_xe = 3.1.4s
cisco / ios_xe = 3.2.0se
cisco / ios_xe = 3.2.1s
cisco / ios_xe = 3.2.1se
cisco / ios_xe = 3.2.2s
cisco / ios_xe = 3.2.2se
cisco / ios_xe = 3.2.3se
cisco / ios_xe = 3.3.0s
cisco / ios_xe = 3.3.0se
cisco / ios_xe = 3.3.0sq
cisco / ios_xe = 3.3.1s
cisco / ios_xe = 3.3.1se
cisco / ios_xe = 3.3.1sq
cisco / ios_xe = 3.3.2s
cisco / ios_xe = 3.3.2se
cisco / ios_xe = 3.3.3se
cisco / ios_xe = 3.3.4se
cisco / ios_xe = 3.3.5se
cisco / ios_xe = 3.4.0as
cisco / ios_xe = 3.4.0s
cisco / ios_xe = 3.4.0sq
cisco / ios_xe = 3.4.1s
cisco / ios_xe = 3.4.1sq
cisco / ios_xe = 3.4.2s
cisco / ios_xe = 3.4.3s
cisco / ios_xe = 3.4.4s
cisco / ios_xe = 3.4.5s
cisco / ios_xe = 3.4.6s
cisco / ios_xe = 3.5.0e
cisco / ios_xe = 3.5.0s
cisco / ios_xe = 3.5.0sq
cisco / ios_xe = 3.5.1e
cisco / ios_xe = 3.5.1s
cisco / ios_xe = 3.5.1sq
cisco / ios_xe = 3.5.2e
cisco / ios_xe = 3.5.2s
cisco / ios_xe = 3.5.2sq
cisco / ios_xe = 3.5.3e
cisco / ios_xe = 3.5.3sq
cisco / ios_xe = 3.6.0e
cisco / ios_xe = 3.6.0s
cisco / ios_xe = 3.6.1e
cisco / ios_xe = 3.6.1s
cisco / ios_xe = 3.6.2ae
cisco / ios_xe = 3.6.2e
cisco / ios_xe = 3.6.2s
cisco / ios_xe = 3.6.3e
cisco / ios_xe = 3.6.4e
cisco / ios_xe = 3.7.0s
cisco / ios_xe = 3.7.1e
cisco / ios_xe = 3.7.1s
cisco / ios_xe = 3.7.2e
cisco / ios_xe = 3.7.2s
cisco / ios_xe = 3.7.2ts
cisco / ios_xe = 3.7.3e
cisco / ios_xe = 3.7.3s
cisco / ios_xe = 3.7.4as
cisco / ios_xe = 3.7.4s
cisco / ios_xe = 3.7.5s
cisco / ios_xe = 3.7.6s
cisco / ios_xe = 3.8.0e
cisco / ios_xe = 3.8.0ex
cisco / ios_xe = 3.8.0s
cisco / ios_xe = 3.8.1e
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 = 3.10.1xbs
cisco / ios_xe = 3.10.2s
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 = 3.11.0s
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 = 3.13.0as
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 = 3.14.0s
cisco / ios_xe = 3.14.1s
cisco / ios_xe = 3.14.2s
cisco / ios_xe = 3.14.3s
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 = 3.16.0cs
cisco / ios_xe = 3.16.0s
cisco / ios_xe = 3.16.1as
cisco / ios_xe = 3.16.1s
cisco / ios_xe = 3.17.0s
cisco / ios_xe_16.1 = 16.1.2
cisco / ios_xe_3.2ja = 3.2.0ja
cisco / ios_xe_3.3sg = 3.3.0sg
cisco / ios_xe_3.3sg = 3.3.1sg
cisco / ios_xe_3.3sg = 3.3.2sg
cisco / ios_xe_3.3xo = 3.3.0xo
cisco / ios_xe_3.3xo = 3.3.1xo
cisco / ios_xe_3.3xo = 3.3.2xo
cisco / ios_xe_3.4sg = 3.4.0sg
cisco / ios_xe_3.4sg = 3.4.1sg
cisco / ios_xe_3.4sg = 3.4.2sg
cisco / ios_xe_3.4sg = 3.4.3sg
cisco / ios_xe_3.4sg = 3.4.4sg
cisco / ios_xe_3.4sg = 3.4.5sg
cisco / ios_xe_3.4sg = 3.4.6sg
cisco / ios_xe_3.4sg = 3.4.7sg

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.