Vulnerability Database

346,508

Total vulnerabilities in the database

CVE-2003-0100 — cisco / ios

Buffer overflow in Cisco IOS 11.2.x to 12.0.x allows remote attackers to cause a denial of service and possibly execute commands via a large number of OSPF neighbor announcements.

  • Published: Mar 3, 2003
  • Updated: Nov 9, 2025
  • CVE: CVE-2003-0100
  • 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 12.0(16)sc3 12.0(16)sc3.x
cisco / ios 11.2xa 11.2xa.x
cisco / ios 11.3(11b) 11.3(11b).x
cisco / ios 12.0(8)s1 12.0(8)s1.x
cisco / ios 12.0xc 12.0xc.x
cisco / ios 11.3xa 11.3xa.x
cisco / ios 12.0xk 12.0xk.x
cisco / ios 12.0xr 12.0xr.x
cisco / ios 11.2(4)f 11.2(4)f.x
cisco / ios 11.1(36)ca2 11.1(36)ca2.x
cisco / ios 11.1ct 11.1ct.x
cisco / ios 11.2f 11.2f.x
cisco / ios 12.0(16.06)s 12.0(16.06)s.x
cisco / ios 12.0st 12.0st.x
cisco / ios 12.0(5)t1 12.0(5)t1.x
cisco / ios 12.0(9) 12.0(9).x
cisco / ios 12.0xq 12.0xq.x
cisco / ios 12.0(13)wt6(1) 12.0(13)wt6(1).x
cisco / ios 12.0(15)s3 12.0(15)s3.x
cisco / ios 12.0(16a) 12.0(16a).x
cisco / ios 12.0(18)s5 12.0(18)s5.x
cisco / ios 12.0(5)wc3 12.0(5)wc3.x
cisco / ios 11.3ma 11.3ma.x
cisco / ios 12.0(5)yb4 12.0(5)yb4.x
cisco / ios 12.0(7)sc 12.0(7)sc.x
cisco / ios 12.0dc 12.0dc.x
cisco / ios 12.0xe 12.0xe.x
cisco / ios 11.1(15)ca 11.1(15)ca.x
cisco / ios 11.3na 11.3na.x
cisco / ios 12.0(1)xb 12.0(1)xb.x
cisco / ios 11.1(13) 11.1(13).x
cisco / ios 11.1(16)aa 11.1(16)aa.x
cisco / ios 11.2(4)xaf 11.2(4)xaf.x
cisco / ios 11.2bc 11.2bc.x
cisco / ios 12.0(17a) 12.0(17a).x
cisco / ios 12.0(2)xd 12.0(2)xd.x
cisco / ios 12.0(5)xk2 12.0(5)xk2.x
cisco / ios 12.0(5.3)wc1 12.0(5.3)wc1.x
cisco / ios 12.0(7.4)s 12.0(7.4)s.x
cisco / ios 12.0(9)s 12.0(9)s.x
cisco / ios 12.0(9)s8 12.0(9)s8.x
cisco / ios 12.0xj 12.0xj.x
cisco / ios 12.0xs 12.0xs.x
cisco / ios 12.0(16)st1 12.0(16)st1.x
cisco / ios 12.0(2) 12.0(2).x
cisco / ios 11.1ia 11.1ia.x
cisco / ios 11.2(8)p 11.2(8)p.x
cisco / ios 11.2(8)sa3 11.2(8)sa3.x
cisco / ios 11.3da 11.3da.x
cisco / ios 12.0(7)db2 12.0(7)db2.x
cisco / ios 12.0(9a) 12.0(9a).x
cisco / ios 12.0xd 12.0xd.x
cisco / ios 12.0xl 12.0xl.x
cisco / ios 11.1(13)ia 11.1(13)ia.x
cisco / ios 11.1(15)aa 11.1(15)aa.x
cisco / ios 11.1(20)aa4 11.1(20)aa4.x
cisco / ios 12.0(1)w 12.0(1)w.x
cisco / ios 12.0(14)s7 12.0(14)s7.x
cisco / ios 12.0(16)s8 12.0(16)s8.x
cisco / ios 12.0(4)xm 12.0(4)xm.x
cisco / ios 12.0(7)xk 12.0(7)xk.x
cisco / ios 12.0(8.0.2)s 12.0(8.0.2)s.x
cisco / ios 12.0(8.3)sc 12.0(8.3)sc.x
cisco / ios 11.1(15)ia 11.1(15)ia.x
cisco / ios 11.1(24b) 11.1(24b).x
cisco / ios 11.1ca 11.1ca.x
cisco / ios 11.2(19)gs0.2 11.2(19)gs0.2.x
cisco / ios 11.2(4)f1 11.2(4)f1.x
cisco / ios 11.2wa4 11.2wa4.x
cisco / ios 12.0(1)xe 12.0(1)xe.x
cisco / ios 12.0(11)st4 12.0(11)st4.x
cisco / ios 11.1cc 11.1cc.x
cisco / ios 11.3 11.3.x
cisco / ios 11.3(1)ed 11.3(1)ed.x
cisco / ios 11.3(7)db1 11.3(7)db1.x
cisco / ios 12.0(10)s7 12.0(10)s7.x
cisco / ios 12.0(10)w5 12.0(10)w5.x
cisco / ios 12.0(12a) 12.0(12a).x
cisco / ios 12.0(14)w5(20) 12.0(14)w5(20).x
cisco / ios 12.0(14a) 12.0(14a).x
cisco / ios 12.0(16)w5(21) 12.0(16)w5(21).x
cisco / ios 12.0(3d) 12.0(3d).x
cisco / ios 12.0(5.4)wc1 12.0(5.4)wc1.x
cisco / ios 12.0(7a) 12.0(7a).x
cisco / ios 12.0xa 12.0xa.x
cisco / ios 12.0xb 12.0xb.x
cisco / ios 12.0xu 12.0xu.x
cisco / ios 12.0(14)st3 12.0(14)st3.x
cisco / ios 12.0(17)sl2 12.0(17)sl2.x
cisco / ios 12.0(3) 12.0(3).x
cisco / ios 12.0(5)xe 12.0(5)xe.x
cisco / ios 12.0(5.2)xu 12.0(5.2)xu.x
cisco / ios 12.0(7)t 12.0(7)t.x
cisco / ios 12.0(7)t2 12.0(7)t2.x
cisco / ios 12.0(7)xk3 12.0(7)xk3.x
cisco / ios 12.0(7)xv 12.0(7)xv.x
cisco / ios 12.0(8a) 12.0(8a).x
cisco / ios 12.0sc 12.0sc.x
cisco / ios 12.0sl 12.0sl.x
cisco / ios 12.0xh 12.0xh.x
cisco / ios 11.1(13)ca 11.1(13)ca.x
cisco / ios 11.1(17)cc 11.1(17)cc.x
cisco / ios 11.2 11.2.x
cisco / ios 11.2(26a) 11.2(26a).x
cisco / ios 11.2(8)sa1 11.2(8)sa1.x
cisco / ios 11.2p 11.2p.x
cisco / ios 11.3aa 11.3aa.x
cisco / ios 11.3db 11.3db.x
cisco / ios 12.0(1) 12.0(1).x
cisco / ios 12.0(10)w5(18f) 12.0(10)w5(18f).x
cisco / ios 12.0(10)w5(18g) 12.0(10)w5(18g).x
cisco / ios 12.0(13)w5(19c) 12.0(13)w5(19c).x
cisco / ios 12.0(17) 12.0(17).x
cisco / ios 12.0(2)xf 12.0(2)xf.x
cisco / ios 12.0(4)xe 12.0(4)xe.x
cisco / ios 12.0(6b) 12.0(6b).x
cisco / ios 12.0(7)dc1 12.0(7)dc1.x
cisco / ios 12.0(7)xf 12.0(7)xf.x
cisco / ios 12.0db 12.0db.x
cisco / ios 12.0t 12.0t.x
cisco / ios 11.1(7)aa 11.1(7)aa.x
cisco / ios 11.1(7)ca 11.1(7)ca.x
cisco / ios 11.1(9)ia 11.1(9)ia.x
cisco / ios 11.2(26b) 11.2(26b).x
cisco / ios 11.2(4) 11.2(4).x
cisco / ios 11.2sa 11.2sa.x
cisco / ios 11.3(11b)t2 11.3(11b)t2.x
cisco / ios 12.0(10a) 12.0(10a).x
cisco / ios 12.0(15a) 12.0(15a).x
cisco / ios 12.0(18)st1 12.0(18)st1.x
cisco / ios 12.0(2)xg 12.0(2)xg.x
cisco / ios 12.0(4)xe1 12.0(4)xe1.x
cisco / ios 12.0(7)s1 12.0(7)s1.x
cisco / ios 12.0(7)xf1 12.0(7)xf1.x
cisco / ios 12.0w5 12.0w5.x
cisco / ios 11.1(28a)ct 11.1(28a)ct.x
cisco / ios 11.1aa 11.1aa.x
cisco / ios 11.2(17) 11.2(17).x
cisco / ios 11.2(9)p 11.2(9)p.x
cisco / ios 11.2(9)xa 11.2(9)xa.x
cisco / ios 11.3(11c) 11.3(11c).x
cisco / ios 11.3(2)xa 11.3(2)xa.x
cisco / ios 11.3t 11.3t.x
cisco / ios 12.0(11a) 12.0(11a).x
cisco / ios 12.0(14)st 12.0(14)st.x
cisco / ios 11.1 11.1.x
cisco / ios 11.1(16)ia 11.1(16)ia.x
cisco / ios 11.1(28a)ia 11.1(28a)ia.x
cisco / ios 11.2(19a)gs6 11.2(19a)gs6.x
cisco / ios 11.2(23a)bc1 11.2(23a)bc1.x
cisco / ios 11.2(4)xa 11.2(4)xa.x
cisco / ios 11.3(8)db2 11.3(8)db2.x
cisco / ios 11.3wa4 11.3wa4.x
cisco / ios 12.0(12)s3 12.0(12)s3.x
cisco / ios 12.0(13)s6 12.0(13)s6.x
cisco / ios 12.0(17)st5 12.0(17)st5.x
cisco / ios 12.0(2)xc 12.0(2)xc.x
cisco / ios 12.0(4)s 12.0(4)s.x
cisco / ios 12.0(5)wc 12.0(5)wc.x
cisco / ios 12.0(5)wc2 12.0(5)wc2.x
cisco / ios 12.0(5)xn 12.0(5)xn.x
cisco / ios 12.0(7)wx5(15a) 12.0(7)wx5(15a).x
cisco / ios 12.0(7)xe 12.0(7)xe.x
cisco / ios 12.0sp 12.0sp.x
cisco / ios 12.0xi 12.0xi.x
cisco / ios 12.0(17)sl6 12.0(17)sl6.x
cisco / ios 12.0(17)st1 12.0(17)st1.x
cisco / ios 12.0(18b) 12.0(18b).x
cisco / ios 12.0(3)t2 12.0(3)t2.x
cisco / ios 12.0(5)t 12.0(5)t.x
cisco / ios 12.0(5)xk 12.0(5)xk.x
cisco / ios 12.0(5.1)xp 12.0(5.1)xp.x
cisco / ios 12.0wt 12.0wt.x
cisco / ios 12.0wx 12.0wx.x
cisco / ios 12.0xg 12.0xg.x
cisco / ios 11.1(13)aa 11.1(13)aa.x
cisco / ios 11.1(17)ct 11.1(17)ct.x
cisco / ios 11.1(36)cc2 11.1(36)cc2.x
cisco / ios 11.1(36)cc4 11.1(36)cc4.x
cisco / ios 11.2(26)p2 11.2(26)p2.x
cisco / ios 11.2gs 11.2gs.x
cisco / ios 11.3(1)t 11.3(1)t.x
cisco / ios 11.3(11)b 11.3(11)b.x
cisco / ios 12.0 12.0.x
cisco / ios 12.0(15)s6 12.0(15)s6.x
cisco / ios 12.0(18)s 12.0(18)s.x
cisco / ios 12.0(2)xe 12.0(2)xe.x
cisco / ios 12.0(4)t 12.0(4)t.x
cisco / ios 12.0(5)wc2b 12.0(5)wc2b.x
cisco / ios 12.0(5)xn1 12.0(5)xn1.x
cisco / ios 12.0(5)xs 12.0(5)xs.x
cisco / ios 12.0(7)xe2 12.0(7)xe2.x
cisco / ios 12.0(8) 12.0(8).x
cisco / ios 12.0da 12.0da.x
cisco / ios 12.0sx 12.0sx.x
cisco / ios 12.0xm 12.0xm.x
cisco / ios 12.0xv 12.0xv.x
cisco / ios 12.0xw 12.0xw.x
cisco / ios 11.1(24a) 11.1(24a).x
cisco / ios 11.2(10)bc 11.2(10)bc.x
cisco / ios 11.2(11b)t2 11.2(11b)t2.x
cisco / ios 11.2(8)sa5 11.2(8)sa5.x
cisco / ios 11.2(8.9)sa6 11.2(8.9)sa6.x
cisco / ios 11.2wa3 11.2wa3.x
cisco / ios 11.3ha 11.3ha.x
cisco / ios 12.0(1)xa3 12.0(1)xa3.x
cisco / ios 12.0(11)s6 12.0(11)s6.x
cisco / ios 12.0(13a) 12.0(13a).x
cisco / ios 12.0(17)s 12.0(17)s.x
cisco / ios 12.0(17)s4 12.0(17)s4.x
cisco / ios 12.0(18)w5(22b) 12.0(18)w5(22b).x
cisco / ios 12.0(2b) 12.0(2b).x
cisco / ios 12.0(4)xm1 12.0(4)xm1.x
cisco / ios 12.0(5)wc3b 12.0(5)wc3b.x
cisco / ios 12.0(5)wx 12.0(5)wx.x
cisco / ios 12.0(5)xu 12.0(5)xu.x
cisco / ios 12.0s 12.0s.x
cisco / ios 12.0wc 12.0wc.x
cisco / ios 12.0xf 12.0xf.x
cisco / ios 12.0xn 12.0xn.x
cisco / ios 12.0xp 12.0xp.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.