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CVE-2018-0174

Cisco — Cisco IOS Software and Cisco IOS XE Software Improper Input Validation Vulnerability

Cisco · CWE-20 — Improper input validation · in CISA KEV since 2022-03-03

KEV since 2022 · listed over a yearCISA KEVActively Exploited
75

EVRS 75 of 100 Urgent

Patch This Cycle

Rank 1,059 of 2,960 tracked

Raised to the floor for a confirmed exploited vulnerability.

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Why it scores 75

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.076.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

ios: update to a version newer than 15.2\(4a\)ea5 | ios xe: update to a version newer than 15.2\(4a\)ea5 | ios: update to a version newer than 15.2\(6\)e0a | ios xe: update to a version newer than 15.2\(6\)e0a

Affected versions

  • ios12.2\(33\)sre7a<= 15.2\(4a\)ea5<= 15.2\(6\)e0a
  • ios xe12.2\(33\)sre7a<= 15.2\(4a\)ea5<= 15.2\(6\)e0a
  • 7600 series route switch processor 720
  • 7600 series supervisor engine 32
  • 7600 series supervisor engine 720
  • allen-bradley stratix 8300
  • allen-bradley armorstratix 5700
  • allen-bradley stratix 5400

+3 more affected products; see the full list at NVD.

Remediation

Apply updates per vendor instructions.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 8.6 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.076 (94.5th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2022-03-17 · KEV since 2022 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 8.6 (v3.1), assigned by cisco. Listed ENISA EUVD

Description

NVD

A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCuh91645.

What CISA says to do