Vulnerability Database

393,557

Total vulnerabilities in the database

CVE-2015-6279 — cisco / ios

Improper Input Validation

The IPv6 snooping functionality in the first-hop security subsystem in Cisco IOS 12.2, 15.0, 15.1, 15.2, 15.3, 15.4, and 15.5 and IOS XE 3.2SE, 3.3SE, 3.3XO, 3.4SG, 3.5E, and 3.6E before 3.6.3E; 3.7E before 3.7.2E; 3.9S and 3.10S before 3.10.6S; 3.11S before 3.11.4S; 3.12S and 3.13S before 3.13.3S; and 3.14S before 3.14.2S allows remote attackers to cause a denial of service (device reload) via a malformed ND packet with the Cryptographically Generated Address (CGA) option, aka Bug ID CSCuo04400.

  • Published: Sep 28, 2015
  • Updated: Oct 4, 2026
  • CVE: CVE-2015-6279
  • 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 = 12.2(50)sy
cisco / ios = 12.2(50)sy1
cisco / ios = 12.2(50)sy2
cisco / ios = 12.2(50)sy3
cisco / ios = 12.2(50)sy4
cisco / ios = 15.0(1)ex
cisco / ios = 15.0(1)sy
cisco / ios = 15.0(1)sy1
cisco / ios = 15.0(1)sy2
cisco / ios = 15.0(1)sy3
cisco / ios = 15.0(1)sy4
cisco / ios = 15.0(1)sy5
cisco / ios = 15.0(1)sy6
cisco / ios = 15.0(1)sy7
cisco / ios = 15.0(1)sy7a
cisco / ios = 15.0(1)sy8
cisco / ios = 15.0(2)ea2
cisco / ios = 15.0(2)ej
cisco / ios = 15.0(2)ej1
cisco / ios = 15.0(2)ez
cisco / ios = 15.0(2)se
cisco / ios = 15.0(2)se1
cisco / ios = 15.0(2)se2
cisco / ios = 15.0(2)se3
cisco / ios = 15.0(2)se4
cisco / ios = 15.0(2)se5
cisco / ios = 15.0(2)se6
cisco / ios = 15.0(2)se7
cisco / ios = 15.0(2a)ex5
cisco / ios = 15.1(1)sy
cisco / ios = 15.1(1)sy1
cisco / ios = 15.1(1)sy2
cisco / ios = 15.1(1)sy3
cisco / ios = 15.1(1)sy4
cisco / ios = 15.1(1)sy5
cisco / ios = 15.1(2)sg
cisco / ios = 15.1(2)sg1
cisco / ios = 15.1(2)sg2
cisco / ios = 15.1(2)sg3
cisco / ios = 15.1(2)sg4
cisco / ios = 15.1(2)sg5
cisco / ios = 15.1(2)sy
cisco / ios = 15.1(2)sy1
cisco / ios = 15.1(2)sy2
cisco / ios = 15.1(2)sy3
cisco / ios = 15.1(2)sy4
cisco / ios = 15.1(2)sy4a
cisco / ios = 15.2(1)e
cisco / ios = 15.2(1)e1
cisco / ios = 15.2(1)e2
cisco / ios = 15.2(1)e3
cisco / ios = 15.2(1)sy
cisco / ios = 15.2(1)sy0a
cisco / ios = 15.2(2)e
cisco / ios = 15.2(2)e1
cisco / ios = 15.2(2)e2
cisco / ios = 15.2(2)ea1
cisco / ios = 15.2(2a)e1
cisco / ios = 15.2(3)e
cisco / ios = 15.2(3a)e
cisco / ios = 15.2(4)s
cisco / ios = 15.2(4)s1
cisco / ios = 15.2(4)s2
cisco / ios = 15.2(4)s3
cisco / ios = 15.2(4)s3a
cisco / ios = 15.2(4)s4
cisco / ios = 15.2(4)s4a
cisco / ios = 15.2(4)s5
cisco / ios = 15.2(4)s6
cisco / ios = 15.2(4)s7
cisco / ios = 15.3(1)s
cisco / ios = 15.3(1)s2
cisco / ios = 15.3(2)s
cisco / ios = 15.3(2)s0a
cisco / ios = 15.3(2)s1
cisco / ios = 15.3(2)s2
cisco / ios = 15.3(3)s
cisco / ios = 15.3(3)s1
cisco / ios = 15.3(3)s2
cisco / ios = 15.3(3)s3
cisco / ios = 15.3(3)s4
cisco / ios = 15.4(1)s
cisco / ios = 15.4(1)s1
cisco / ios = 15.4(1)s2
cisco / ios = 15.4(1)s3
cisco / ios = 15.4(2)s
cisco / ios = 15.4(2)s1
cisco / ios = 15.4(2)s2
cisco / ios = 15.4(2)s3
cisco / ios = 15.4(3)s
cisco / ios = 15.4(3)s1
cisco / ios = 15.4(3)s2
cisco / ios_xe = 3.2se.0
cisco / ios_xe = 3.2se.1
cisco / ios_xe = 3.2se.2
cisco / ios_xe = 3.2se.3
cisco / ios_xe = 3.3se.0
cisco / ios_xe = 3.3se.1
cisco / ios_xe = 3.3se.2
cisco / ios_xe = 3.3se.3
cisco / ios_xe = 3.3se.4
cisco / ios_xe = 3.3se.5
cisco / ios_xe = 3.3xo.0
cisco / ios_xe = 3.3xo.1
cisco / ios_xe = 3.3xo.2
cisco / ios_xe = 3.4sg.0
cisco / ios_xe = 3.4sg.1
cisco / ios_xe = 3.4sg.2
cisco / ios_xe = 3.4sg.3
cisco / ios_xe = 3.4sg.4
cisco / ios_xe = 3.4sg.5
cisco / ios_xe = 3.4sg.6
cisco / ios_xe = 3.5e.0
cisco / ios_xe = 3.5e.1
cisco / ios_xe = 3.5e.2
cisco / ios_xe = 3.5e.3
cisco / ios_xe = 3.6e.0
cisco / ios_xe = 3.6e.0a
cisco / ios_xe = 3.6e.0b
cisco / ios_xe = 3.6e.1
cisco / ios_xe = 3.6e.2
cisco / ios_xe = 3.6e.2a
cisco / ios_xe = 3.7e.0
cisco / ios_xe = 3.7e.1
cisco / ios_xe = 3.7e.2
cisco / ios_xe = 3.10s.0
cisco / ios_xe = 3.10s.0a
cisco / ios_xe = 3.10s.01
cisco / ios_xe = 3.10s.1
cisco / ios_xe = 3.10s.2
cisco / ios_xe = 3.10s.3
cisco / ios_xe = 3.10s.4
cisco / ios_xe = 3.11s.0
cisco / ios_xe = 3.11s.1
cisco / ios_xe = 3.11s.2
cisco / ios_xe = 3.11s.3
cisco / ios_xe = 3.12s.0
cisco / ios_xe = 3.12s.1
cisco / ios_xe = 3.12s.2

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.