What is the CVSS score of CVE-2018-0167?

CVE-2018-0167 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 3.4%.

Is CVE-2018-0167 being actively exploited?

Yes, CVE-2018-0167 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active in-the-wild exploitation. Immediate patching is required.

iOS CVE-2018-0167

HIGH

Buffer Overflow (CWE-119)

2018-03-28 psirt@cisco.com

RCE Buffer Overflow Denial Of Service Apple iOS Cisco Ios Xe Ios Xr

8.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-119 ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 8.8 (HIGH). Attack characteristics: adjacent network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to corrupt memory to execute arbitrary code or crash the application. No authentication is required to exploit this vulnerability.

This Week Schedule remediation this week. Why: Active threat signals + CRITICAL/HIGH severity.

Exploited in the wild (CISA KEV) No patch listed yet 3.4% exploitation probability (EPSS)

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AnalysisAI

Multiple Buffer Overflow vulnerabilities in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated,. Rated high severity (CVSS 8.8), this vulnerability is no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Use memory-safe languages or bounds-checking. Enable ASLR, DEP/NX, stack canaries. Use safe string functions.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Buffer Overflow (CWE-119), which allows attackers to corrupt memory to execute arbitrary code or crash the application. Multiple Buffer Overflow vulnerabilities in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition or execute arbitrary code with elevated privileges on an affected device. Cisco Bug IDs: CSCuo17183, CSCvd73487. Affected products include: Cisco Ios, Cisco Ios Xe, Cisco Ios Xr.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH

AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Mar 28, 2018 - 22:29 nvd

HIGH 8.8

DescriptionNVD

Multiple Buffer Overflow vulnerabilities in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition or execute arbitrary code with elevated privileges on an affected device. Cisco Bug IDs: CSCuo17183, CSCvd73487.

Threat Intelligence Overview

EPSS Score

3.4%

Top 12% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

CISA KEV

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV Yes

Public POC No

EPSS 3.4%

Patch available No

Active threat Yes

Deciding rule

Active threat signals + CRITICAL/HIGH severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Active

System Exposure· derived

Controlled

Automatable· derived

Human Impact· derived

High

Priority Score

Low Medium High Critical

KEV: +50

EPSS: +3

CVSS: +44

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

cpe:2.3:o:cisco:ios:5.2.0.base:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ios_xe:5.2.0.base:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*

cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*

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References

Advisories & patches

ADVISORY https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-lldp REF http://www.securityfocus.com/bid/103564 REF http://www.securitytracker.com/id/1040586 REF https://ics-cert.us-cert.gov/advisories/ICSA-18-107-03 REF https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04 REF https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05 REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0167

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