Vulnerability Database

383,371

Total vulnerabilities in the database

CVE-2003-1109 — cisco / ios

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: Sep 13, 2026
  • CVE: CVE-2003-1109
  • Severity: High
  • Exploit:
  • CISA KEV:

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 Affected versions
cisco / ios = 12.2(1)xa
cisco / ios = 12.2(1)xd
cisco / ios = 12.2(1)xd1
cisco / ios = 12.2(1)xd3
cisco / ios = 12.2(1)xd4
cisco / ios = 12.2(1)xe
cisco / ios = 12.2(1)xe2
cisco / ios = 12.2(1)xe3
cisco / ios = 12.2(1)xh
cisco / ios = 12.2(1)xq
cisco / ios = 12.2(1)xs
cisco / ios = 12.2(1)xs1
cisco / ios = 12.2(2)t4
cisco / ios = 12.2(2)xa
cisco / ios = 12.2(2)xa1
cisco / ios = 12.2(2)xa5
cisco / ios = 12.2(2)xb
cisco / ios = 12.2(2)xb3
cisco / ios = 12.2(2)xb4
cisco / ios = 12.2(2)xf
cisco / ios = 12.2(2)xg
cisco / ios = 12.2(2)xh
cisco / ios = 12.2(2)xh2
cisco / ios = 12.2(2)xh3
cisco / ios = 12.2(2)xi
cisco / ios = 12.2(2)xi1
cisco / ios = 12.2(2)xi2
cisco / ios = 12.2(2)xj
cisco / ios = 12.2(2)xj1
cisco / ios = 12.2(2)xk
cisco / ios = 12.2(2)xk2
cisco / ios = 12.2(2)xn
cisco / ios = 12.2(2)xt
cisco / ios = 12.2(2)xt3
cisco / ios = 12.2(2)xu
cisco / ios = 12.2(2)xu2
cisco / ios = 12.2(11)t
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 = 12.2xs
cisco / ios = 12.2xt
cisco / ios = 12.2xw
cisco / pix_firewall_software = 5.2(1)
cisco / pix_firewall_software = 5.2(2)
cisco / pix_firewall_software = 5.2(3.210)
cisco / pix_firewall_software = 5.2(5)
cisco / pix_firewall_software = 5.2(6)
cisco / pix_firewall_software = 5.2(7)
cisco / pix_firewall_software = 5.3
cisco / pix_firewall_software = 5.3(1)
cisco / pix_firewall_software = 5.3(1.200)
cisco / pix_firewall_software = 5.3(2)
cisco / pix_firewall_software = 5.3(3)
cisco / pix_firewall_software = 6.0
cisco / pix_firewall_software = 6.0(1)
cisco / pix_firewall_software = 6.0(2)
cisco / pix_firewall_software = 6.1(2)
cisco / pix_firewall_software = 6.2(1)

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.