Vulnerability Database

393,392

Total vulnerabilities in the database

CVE-2006-0340 — cisco / ios

Improper Input Validation

Unspecified vulnerability in Stack Group Bidding Protocol (SGBP) support in Cisco IOS 12.0 through 12.4 running on various Cisco products, when SGBP is enabled, allows remote attackers on the local network to cause a denial of service (device hang and network traffic loss) via a crafted UDP packet to port 9900.

  • Published: Jan 21, 2006
  • Updated: Oct 3, 2026
  • CVE: CVE-2006-0340
  • Severity: High
  • Exploit:
  • CISA KEV:

CVSS v2:

  • Severity: High
  • Score: 7.1
  • AV:N/AC:M/Au:N/C:N/I:N/A:C

CWEs:

Software Affected versions
cisco / ios = 12.0
cisco / ios = 12.0s
cisco / ios = 12.0sc
cisco / ios = 12.0t
cisco / ios = 12.0xa
cisco / ios = 12.0xc
cisco / ios = 12.0xd
cisco / ios = 12.0xe
cisco / ios = 12.0xg
cisco / ios = 12.0xh
cisco / ios = 12.0xi
cisco / ios = 12.0xj
cisco / ios = 12.0xk
cisco / ios = 12.0xl
cisco / ios = 12.0xn
cisco / ios = 12.0xr
cisco / ios = 12.1
cisco / ios = 12.1aa
cisco / ios = 12.1e
cisco / ios = 12.1ec
cisco / ios = 12.1ex
cisco / ios = 12.1ez
cisco / ios = 12.1ga
cisco / ios = 12.1gb
cisco / ios = 12.1t
cisco / ios = 12.1xa
cisco / ios = 12.1xd
cisco / ios = 12.1xh
cisco / ios = 12.1xi
cisco / ios = 12.1xl
cisco / ios = 12.1xm
cisco / ios = 12.1xq
cisco / ios = 12.1xs
cisco / ios = 12.1xu
cisco / ios = 12.1xw
cisco / ios = 12.1xx
cisco / ios = 12.1xy
cisco / ios = 12.1xz
cisco / ios = 12.1ya
cisco / ios = 12.1yb
cisco / ios = 12.1yd
cisco / ios = 12.2
cisco / ios = 12.2b
cisco / ios = 12.2bc
cisco / ios = 12.2bw
cisco / ios = 12.2by
cisco / ios = 12.2cx
cisco / ios = 12.2dd
cisco / ios = 12.2dx
cisco / ios = 12.2mc
cisco / ios = 12.2s
cisco / ios = 12.2su
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 = 12.2xf
cisco / ios = 12.2xg
cisco / ios = 12.2xk
cisco / ios = 12.2xl
cisco / ios = 12.2xs
cisco / ios = 12.2xt
cisco / ios = 12.2xv
cisco / ios = 12.2yd
cisco / ios = 12.2ye
cisco / ios = 12.2yn
cisco / ios = 12.2yt
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 = 12.2zd
cisco / ios = 12.2ze
cisco / ios = 12.2zj
cisco / ios = 12.2zn
cisco / ios = 12.3
cisco / ios = 12.3b
cisco / ios = 12.3bc
cisco / ios = 12.3bw
cisco / ios = 12.3t
cisco / ios = 12.3xb
cisco / ios = 12.3xd
cisco / ios = 12.3xf
cisco / ios = 12.3xh
cisco / ios = 12.3xi
cisco / ios = 12.3xj
cisco / ios = 12.3xm
cisco / ios = 12.3xq
cisco / ios = 12.3xu
cisco / ios = 12.3xw
cisco / ios = 12.3yf
cisco / ios = 12.3yg
cisco / ios = 12.3yj
cisco / ios = 12.3yk
cisco / ios = 12.3ym
cisco / ios = 12.3yq
cisco / ios = 12.3yt
cisco / ios = 12.3yu
cisco / ios = 12.3yx
cisco / ios = 12.4
cisco / ios = 12.4mr
cisco / ios = 12.4t
cisco / ios = 12.4xa
cisco / ios = 12.4xb

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.