Vulnerability Database

346,508

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: Nov 9, 2025
  • CVE: CVE-2006-0340
  • Severity: High
  • Exploit:

CVSS v2:

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

CWEs:

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