Vulnerability Database

389,860

Total vulnerabilities in the database

CVE-2005-2451 — cisco / ios

Cisco IOS 12.0 through 12.4 and IOS XR before 3.2, with IPv6 enabled, allows remote attackers on a local network segment to cause a denial of service (device reload) and possibly execute arbitrary code via a crafted IPv6 packet.

  • Published: Aug 3, 2005
  • Updated: Sep 25, 2026
  • CVE: CVE-2005-2451
  • Severity: Low
  • Exploit:
  • CISA KEV:

CVSS v2:

  • Severity: Low
  • Score: 2.1
  • AV:L/AC:L/Au:N/C:N/I:N/A:P

No CWE or OWASP classifications available.

Software Affected versions
cisco / ios = 12.0s
cisco / ios = 12.0sl
cisco / ios = 12.0st
cisco / ios = 12.0sy
cisco / ios = 12.1xu
cisco / ios = 12.1xv
cisco / ios = 12.1yb
cisco / ios = 12.1yc
cisco / ios = 12.1yd
cisco / ios = 12.1ye
cisco / ios = 12.1yf
cisco / ios = 12.1yh
cisco / ios = 12.1yi
cisco / ios = 12.2b
cisco / ios = 12.2bc
cisco / ios = 12.2bw
cisco / ios = 12.2bx
cisco / ios = 12.2by
cisco / ios = 12.2bz
cisco / ios = 12.2cx
cisco / ios = 12.2cy
cisco / ios = 12.2dd
cisco / ios = 12.2dx
cisco / ios = 12.2eu
cisco / ios = 12.2ew
cisco / ios = 12.2ewa
cisco / ios = 12.2ez
cisco / ios = 12.2ja
cisco / ios = 12.2jk
cisco / ios = 12.2mb
cisco / ios = 12.2mc
cisco / ios = 12.2mx
cisco / ios = 12.2s
cisco / ios = 12.2seb
cisco / ios = 12.2sec
cisco / ios = 12.2so
cisco / ios = 12.2su
cisco / ios = 12.2sv
cisco / ios = 12.2sw
cisco / ios = 12.2sx
cisco / ios = 12.2sxa
cisco / ios = 12.2sxb
cisco / ios = 12.2sxd
cisco / ios = 12.2sxe
cisco / ios = 12.2sy
cisco / ios = 12.2sz
cisco / ios = 12.2t
cisco / ios = 12.2xa
cisco / ios = 12.2xb
cisco / ios = 12.2xc
cisco / ios = 12.2xd
cisco / ios = 12.2xe
cisco / ios = 12.2xf
cisco / ios = 12.2xg
cisco / ios = 12.2xh
cisco / ios = 12.2xi
cisco / ios = 12.2xj
cisco / ios = 12.2xk
cisco / ios = 12.2xl
cisco / ios = 12.2xm
cisco / ios = 12.2xn
cisco / ios = 12.2xq
cisco / ios = 12.2xr
cisco / ios = 12.2xt
cisco / ios = 12.2xu
cisco / ios = 12.2xw
cisco / ios = 12.2xz
cisco / ios = 12.2ya
cisco / ios = 12.2yb
cisco / ios = 12.2yc
cisco / ios = 12.2yd
cisco / ios = 12.2ye
cisco / ios = 12.2yf
cisco / ios = 12.2yg
cisco / ios = 12.2yh
cisco / ios = 12.2yj
cisco / ios = 12.2yk
cisco / ios = 12.2yl
cisco / ios = 12.2ym
cisco / ios = 12.2yn
cisco / ios = 12.2yo
cisco / ios = 12.2yp
cisco / ios = 12.2yq
cisco / ios = 12.2yr
cisco / ios = 12.2yt
cisco / ios = 12.2yu
cisco / ios = 12.2yv
cisco / ios = 12.2yw
cisco / ios = 12.2yx
cisco / ios = 12.2yy
cisco / ios = 12.2yz
cisco / ios = 12.2za
cisco / ios = 12.2zb
cisco / ios = 12.2zc
cisco / ios = 12.2zd
cisco / ios = 12.2ze
cisco / ios = 12.2zf
cisco / ios = 12.2zg
cisco / ios = 12.2zh
cisco / ios = 12.2zj
cisco / ios = 12.2zl
cisco / ios = 12.2zn
cisco / ios = 12.2zo
cisco / ios = 12.2zp
cisco / ios = 12.3
cisco / ios = 12.3b
cisco / ios = 12.3bc
cisco / ios = 12.3bw
cisco / ios = 12.3ja
cisco / ios = 12.3t
cisco / ios = 12.3xa
cisco / ios = 12.3xb
cisco / ios = 12.3xc
cisco / ios = 12.3xd
cisco / ios = 12.3xe
cisco / ios = 12.3xf
cisco / ios = 12.3xg
cisco / ios = 12.3xh
cisco / ios = 12.3xi
cisco / ios = 12.3xj
cisco / ios = 12.3xk
cisco / ios = 12.3xl
cisco / ios = 12.3xm
cisco / ios = 12.3xq
cisco / ios = 12.3xr
cisco / ios = 12.3xs
cisco / ios = 12.3xt
cisco / ios = 12.3xu
cisco / ios = 12.3xw
cisco / ios = 12.3xx
cisco / ios = 12.3xy
cisco / ios = 12.3ya
cisco / ios = 12.3yd
cisco / ios = 12.3yf
cisco / ios = 12.3yg
cisco / ios = 12.3yh
cisco / ios = 12.3yi
cisco / ios = 12.3yj
cisco / ios = 12.3yk
cisco / ios = 12.3yq
cisco / ios = 12.3ys
cisco / ios = 12.3yt
cisco / ios = 12.3yu
cisco / ios = 12.4
cisco / ios = 12.4mr
cisco / ios = 12.4t
cisco / ios_xr = 3.0.1
cisco / ios_xr = 3.1.0

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.