Vulnerability Database

393,557

Total vulnerabilities in the database

CVE-2015-0638 — cisco / ios

Improper Input Validation

Cisco IOS 12.2, 12.4, 15.0, 15.2, and 15.3, when a VRF interface is configured, allows remote attackers to cause a denial of service (interface queue wedge) via crafted ICMPv4 packets, aka Bug ID CSCsi02145.

  • Published: Mar 26, 2015
  • Updated: Oct 4, 2026
  • CVE: CVE-2015-0638
  • Severity: High
  • Exploit:
  • CISA KEV:

CVSS v2:

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

CWEs:

Software Affected versions
cisco / ios = 12.2(33)ird1
cisco / ios = 12.2(33)ire3
cisco / ios = 12.2(33)sxi4b
cisco / ios = 12.2(44)sq1
cisco / ios = 12.4(25e)jam1
cisco / ios = 12.4(25e)jap1m
cisco / ios = 12.4(25e)jaz1
cisco / ios = 15.0(2)ed1
cisco / ios = 15.2(1)ex
cisco / ios = 15.2(2)gc
cisco / ios = 15.2(2)ja
cisco / ios = 15.2(2)ja1
cisco / ios = 15.2(2)jax
cisco / ios = 15.2(2)jax1
cisco / ios = 15.2(2)jb
cisco / ios = 15.2(2)jb1
cisco / ios = 15.2(2)jb2
cisco / ios = 15.2(2)jb3
cisco / ios = 15.2(2)jb4
cisco / ios = 15.2(2)jn1
cisco / ios = 15.2(2)jn2
cisco / ios = 15.2(2)t
cisco / ios = 15.2(2)t1
cisco / ios = 15.2(2)t2
cisco / ios = 15.2(2)t3
cisco / ios = 15.2(2)t4
cisco / ios = 15.2(3)t
cisco / ios = 15.3(2)s2
cisco / ios = 15.3(3)ja1n
cisco / ios = 15.3(3)jab1
cisco / ios = 15.3(3)jn

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.