Threats / Cisco / CVE-2018-0167
CVE-2018-0167
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Cisco IOS, XR, and XE Software vulnerability
Buffer overflow in LLDP subsystem of Cisco IOS, IOS XE, and IOS XR Software allows unauthenticated adjacent attackers to cause denial of service or execute arbitrary code.
Verdict
Today item — known-exploited.
An unauthenticated attacker on an adjacent network segment can exploit a buffer overflow in the LLDP implementation to crash affected devices or gain code execution, disrupting network operations and potentially compromising device integrity.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
2 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03).
Probability (EPSS)
EPSS 0.03449 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Cisco, IOS, XR, and XE Software. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-119 Memory Buffer Bounds Error — weakness family: Memory safety.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious LLDP packet and send it to an adjacent network segment where the target device resides.
Business
Network availability is disrupted as the device becomes unresponsive or reboots unexpectedly.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I trigger the buffer overflow condition through the LLDP subsystem to execute arbitrary code with device privileges.
Business
Device control is compromised, enabling lateral movement, data exfiltration, or persistent network compromise.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05