Vulnerability Database

327,594

Total vulnerabilities in the database

CVE-2005-2105

Cisco IOS 12.2T through 12.4 allows remote attackers to bypass Authentication, Authorization, and Accounting (AAA) RADIUS authentication, if the fallback method is set to none, via a long username.

  • Published: Jul 5, 2005
  • Updated: Nov 9, 2025
  • CVE: CVE-2005-2105
  • Severity: High
  • Exploit:

CVSS v2:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/Au:N/C:P/I:P/A:P

No CWE or OWASP classifications available.

Software From Fixed in
cisco / ios 12.3yq 12.3yq.x
cisco / ios 12.3xr 12.3xr.x
cisco / ios 12.3bc 12.3bc.x
cisco / ios 12.2xr 12.2xr.x
cisco / ios 12.3ya 12.3ya.x
cisco / ios 12.3yl 12.3yl.x
cisco / ios 12.2zn 12.2zn.x
cisco / ios 12.2xe 12.2xe.x
cisco / ios 12.3xs 12.3xs.x
cisco / ios 12.3xg 12.3xg.x
cisco / ios 12.3yr 12.3yr.x
cisco / ios 12.2zp 12.2zp.x
cisco / ios 12.3bw 12.3bw.x
cisco / ios 12.3xd 12.3xd.x
cisco / ios 12.3xm 12.3xm.x
cisco / ios 12.3xw 12.3xw.x
cisco / ios 12.2xj 12.2xj.x
cisco / ios 12.2xh 12.2xh.x
cisco / ios 12.2xg 12.2xg.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 12.2yf 12.2yf.x
cisco / ios 12.2xl 12.2xl.x
cisco / ios 12.2ym 12.2ym.x
cisco / ios 12.3xt 12.3xt.x
cisco / ios 12.2yw 12.2yw.x
cisco / ios 12.2yd 12.2yd.x
cisco / ios 12.3xj 12.3xj.x
cisco / ios 12.3t 12.3t.x
cisco / ios 12.2yb 12.2yb.x
cisco / ios 12.2zh 12.2zh.x
cisco / ios 12.2yv 12.2yv.x
cisco / ios 12.2xw 12.2xw.x
cisco / ios 12.2t 12.2t.x
cisco / ios 12.2zc 12.2zc.x
cisco / ios 12.2yt 12.2yt.x
cisco / ios 12.2yl 12.2yl.x
cisco / ios 12.3yd 12.3yd.x
cisco / ios 12.2zb 12.2zb.x
cisco / ios 12.2yg 12.2yg.x
cisco / ios 12.3xf 12.3xf.x
cisco / ios 12.3xl 12.3xl.x
cisco / ios 12.2yr 12.2yr.x
cisco / ios 12.3yk 12.3yk.x
cisco / ios 12.3yb 12.3yb.x
cisco / ios 12.3yf 12.3yf.x
cisco / ios 12.2zo 12.2zo.x
cisco / ios 12.2(4)xr 12.2(4)xr.x
cisco / ios 12.2xm 12.2xm.x
cisco / ios 12.2xk 12.2xk.x
cisco / ios 12.3xb 12.3xb.x
cisco / ios 12.2zj 12.2zj.x
cisco / ios 12.3yg 12.3yg.x
cisco / ios 12.3xu 12.3xu.x
cisco / ios 12.2zd 12.2zd.x
cisco / ios 12.3xy 12.3xy.x
cisco / ios 12.3xc 12.3xc.x
cisco / ios 12.4 12.4.x
cisco / ios 12.2xc 12.2xc.x
cisco / ios 12.3xe 12.3xe.x
cisco / ios 12.2yc 12.2yc.x
cisco / ios 12.2ze 12.2ze.x
cisco / ios 12.3ja 12.3ja.x
cisco / ios 12.2yp 12.2yp.x
cisco / ios 12.2yy 12.2yy.x
cisco / ios 12.2xi 12.2xi.x
cisco / ios 12.2(2)xr 12.2(2)xr.x
cisco / ios 12.2yu 12.2yu.x
cisco / ios 12.2xd 12.2xd.x
cisco / ios 12.3xq 12.3xq.x
cisco / ios 12.2zl 12.2zl.x
cisco / ios 12.2yq 12.2yq.x
cisco / ios 12.3xh 12.3xh.x
cisco / ios 12.2xf 12.2xf.x
cisco / ios 12.2xq 12.2xq.x
cisco / ios 12.3ys 12.3ys.x
cisco / ios 12.2zf 12.2zf.x
cisco / ios 12.3b 12.3b.x
cisco / ios 12.3yh 12.3yh.x
cisco / ios 12.2ya 12.2ya.x
cisco / ios 12.2zg 12.2zg.x
cisco / ios 12.3xx 12.3xx.x
cisco / ios 12.3xa 12.3xa.x
cisco / ios 12.3yi 12.3yi.x
cisco / ios 12.3xk 12.3xk.x
cisco / ios 12.2yj 12.2yj.x
cisco / ios 12.3yn 12.3yn.x
cisco / ios 12.3xn 12.3xn.x
cisco / ios 12.2yh 12.2yh.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.