Vulnerability Database

326,214

Total vulnerabilities in the database

CVE-2003-1109

The Session Initiation Protocol (SIP) implementation in multiple Cisco products including IP Phone models 7940 and 7960, IOS versions in the 12.2 train, and Secure PIX 5.2.9 to 6.2.2 allows remote attackers to cause a denial of service and possibly execute arbitrary code via crafted INVITE messages, as demonstrated by the OUSPG PROTOS c07-sip test suite.

  • Published: Dec 31, 2003
  • Updated: Nov 9, 2025
  • CVE: CVE-2003-1109
  • 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 12.2(1)xs 12.2(1)xs.x
cisco / ios 12.2(1)xd1 12.2(1)xd1.x
cisco / ios 12.2xr 12.2xr.x
cisco / ios 12.2(1)xq 12.2(1)xq.x
cisco / ios 12.2(1)xd3 12.2(1)xd3.x
cisco / ios 12.2xe 12.2xe.x
cisco / ios 12.2(1)xs1 12.2(1)xs1.x
cisco / ios 12.2(2)xk 12.2(2)xk.x
cisco / ios 12.2xj 12.2xj.x
cisco / ios 12.2(2)xb4 12.2(2)xb4.x
cisco / ios 12.2(2)xu 12.2(2)xu.x
cisco / ios 12.2xg 12.2xg.x
cisco / ios 12.2xn 12.2xn.x
cisco / ios 12.2(1)xa 12.2(1)xa.x
cisco / ios 12.2(2)xh3 12.2(2)xh3.x
cisco / ios 12.2(2)xi 12.2(2)xi.x
cisco / ios 12.2xl 12.2xl.x
cisco / ios 12.2(1)xe2 12.2(1)xe2.x
cisco / ios 12.2(2)xh 12.2(2)xh.x
cisco / ios 12.2(2)xh2 12.2(2)xh2.x
cisco / ios 12.2xb 12.2xb.x
cisco / ios 12.2xw 12.2xw.x
cisco / ios 12.2(1)xd4 12.2(1)xd4.x
cisco / ios 12.2(2)t4 12.2(2)t4.x
cisco / ios 12.2(2)xj1 12.2(2)xj1.x
cisco / ios 12.2t 12.2t.x
cisco / ios 12.2xh 12.2xh.x
cisco / ios 12.2(1)xd 12.2(1)xd.x
cisco / ios 12.2(2)xb3 12.2(2)xb3.x
cisco / ios 12.2(2)xi1 12.2(2)xi1.x
cisco / ios 12.2(2)xi2 12.2(2)xi2.x
cisco / ios 12.2(2)xu2 12.2(2)xu2.x
cisco / ios 12.2xf 12.2xf.x
cisco / ios 12.2xq 12.2xq.x
cisco / ios 12.2(1)xe3 12.2(1)xe3.x
cisco / ios 12.2(1)xh 12.2(1)xh.x
cisco / ios 12.2(2)xa5 12.2(2)xa5.x
cisco / ios 12.2(2)xb 12.2(2)xb.x
cisco / ios 12.2(2)xn 12.2(2)xn.x
cisco / ios 12.2(2)xt 12.2(2)xt.x
cisco / ios 12.2(2)xt3 12.2(2)xt3.x
cisco / ios 12.2xd 12.2xd.x
cisco / ios 12.2xm 12.2xm.x
cisco / ios 12.2(1)xe 12.2(1)xe.x
cisco / ios 12.2(2)xa 12.2(2)xa.x
cisco / ios 12.2(2)xa1 12.2(2)xa1.x
cisco / ios 12.2(2)xk2 12.2(2)xk2.x
cisco / ios 12.2xc 12.2xc.x
cisco / ios 12.2xk 12.2xk.x
cisco / ios 12.2xt 12.2xt.x
cisco / ios 12.2(11)t 12.2(11)t.x
cisco / ios 12.2(2)xf 12.2(2)xf.x
cisco / ios 12.2(2)xg 12.2(2)xg.x
cisco / ios 12.2(2)xj 12.2(2)xj.x
cisco / ios 12.2xa 12.2xa.x
cisco / ios 12.2xi 12.2xi.x
cisco / ios 12.2xs 12.2xs.x
cisco / ip_phone_7960 - -
cisco / ip_phone_7940 - -
cisco / pix_firewall_software 5.3 5.3.x
cisco / pix_firewall_software 5.3(1) 5.3(1).x
cisco / pix_firewall_software 5.3(1.200) 5.3(1.200).x
cisco / pix_firewall_software 6.0(1) 6.0(1).x
cisco / pix_firewall_software 6.0(2) 6.0(2).x
cisco / pix_firewall_software 5.2(1) 5.2(1).x
cisco / pix_firewall_software 5.2(2) 5.2(2).x
cisco / pix_firewall_software 5.3(2) 5.3(2).x
cisco / pix_firewall_software 6.1(2) 6.1(2).x
cisco / pix_firewall_software 6.2(1) 6.2(1).x
cisco / pix_firewall_software 5.2(6) 5.2(6).x
cisco / pix_firewall_software 5.2(7) 5.2(7).x
cisco / pix_firewall_software 5.2(3.210) 5.2(3.210).x
cisco / pix_firewall_software 5.2(5) 5.2(5).x
cisco / pix_firewall_software 5.3(3) 5.3(3).x
cisco / pix_firewall_software 6.0 6.0.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.