CVE-2018-0167

Exp

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.

Published: 2018-03-28 Last update: 2026-01-14 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-0167 is rated Critical Active Threat (88.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.21%). CISA KEV confirms active exploitation (added 2022-03-03) affecting Cisco / IOS, XR, and XE Software. a weakness (CWE-119) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2018-0167

Name: Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability · CISA KEV detail

Exploit added: 2022-03-03

Action due: 2022-03-17

Required action: Apply updates per vendor instructions.

Exploit prediction scoring system (EPSS) score for CVE-2018-0167

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-07 0.89% 1.21% +0.32%
2 2026-03-04 1.15% 0.89% -0.25%
3 2026-02-19 — 1.15% —

Full EPSS history (27 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-0167

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
8.8 3.1 HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0
8.3 2.0 HIGH
AV:A/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 6.5 10.0 [email protected]

Weakness enumeration for CVE-2018-0167

Affected software / configurations for CVE-2018-0167

Vendor Product Version Raw CPE
cisco ios 5.2.0.base cpe:2.3:o:cisco:ios:5.2.0.base:*:*:*:*:*:*:*
cisco ios_xe 5.2.0.base cpe:2.3:o:cisco:ios_xe:5.2.0.base:*:*:*:*:*:*:*
cisco ios_xr >= 4.1, < 5.1.3 cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
cisco ios <= 15.6.3m1 cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
cisco ios_xe <= 15.6.3m1 cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
cisco ios <= 15.2\(6\)e0a cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
cisco ios_xe <= 15.2\(6\)e0a cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
cisco ios <= 15.2\(4a\)ea5 cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
cisco ios_xe <= 15.2\(4a\)ea5 cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*

References for CVE-2018-0167

cvelogic Threat Intelligence