CVE-2018-0167
HighExploitedPublic exploitMultiple 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…
Published Mar 28, 2018 · Updated Jan 14, 2026
Key Facts
Patch immediately- CVE-2018-0167 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting IOS (Cisco), IOS Xe (Cisco), IOS Xr (Cisco) and 1 more product.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 3, 2022. Public exploit code is available.
- EPSS estimates a 3.4% probability of exploitation in the next 30 days.
- Fixed versions are available, including IOS <=15.6.3m1, IOS Xe <=15.6.3m1, IOS Xr 5.1.3.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
3.4%
Higher than 88.5% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2018-0167 brief as a PDF
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Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Mar 3, 2022 | Mar 17, 2022 | Not reported |
| Industry KEV feed | Mar 3, 2022 | Mar 17, 2022 | Not reported |
| CIRCL KEV | Mar 3, 2022 | Mar 17, 2022 | Not reported |
| ENISA EUVD | Mar 3, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| IOSCisco | 5.2.0.base | 15.6.3m1 |
| IOS XeCisco | 5.2.0.base | 15.6.3m1 |
| IOS XrCisco | See advisory | 5.1.3 |
| Cisco IOS, IOS XE, and IOS XR | >= Cisco IOS, IOS XE, and IOS XR | n/a |
Patched Releases
IOS
<=15.6.3m1
IOS Xe
<=15.6.3m1
IOS Xr
5.1.3
Timeline
Publicly disclosed
Mar 28, 2018
Added to CISA KEV
Mar 3, 2022
Added to Industry KEV feed
Mar 3, 2022
Added to CIRCL KEV
Mar 3, 2022
Added to ENISA EUVD
Mar 3, 2022
Last updated
Jan 14, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
- advisoryhttps://ics-cert.us-cert.gov/advisories/ICSA-18-107-03
- advisoryhttps://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
- advisoryhttps://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
- advisoryhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-lldp
- advisory103564
FAQ
Common Questions.
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: IOS (Cisco) versions 5.2.0.base; IOS Xe (Cisco) versions 5.2.0.base; IOS Xr (Cisco), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 3, 2022.
Yes. It was added on Mar 3, 2022 with a federal remediation due date of Mar 17, 2022.
Public exploit code is available.
Fixed versions are available, including IOS <=15.6.3m1, IOS Xe <=15.6.3m1, IOS Xr 5.1.3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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