# CVE-2018-0167: Cisco IOS, XR, and XE Software Buffer Overflow

> Unauthenticated adjacent attackers can trigger buffer overflows in LLDP to execute arbitrary code or cause denial of service on Cisco IOS devices.

- **Severity:** High 8.8 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 3 Mar 2022 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Mar 2018
- **Updated:** 12 Jan 2026
- **Also known as:** GHSA-h85m-74j9-4r6m

## What is CVE-2018-0167?

CVE-2018-0167 is a high-severity memory corruption vulnerability in Cisco Ios, published on 28 Mar 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2018-0167?

It affects 3 products.


Products: Cisco Ios, Cisco Ios Xe, Cisco Ios Xr.

## How do I fix CVE-2018-0167?

No fix has been published for CVE-2018-0167 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Mar 2022.

## Is CVE-2018-0167 being exploited?

Yes. Attackers have exploited CVE-2018-0167 in the wild since at least 3 Mar 2022.

## Other vulnerabilities in Cisco Ios

- [CVE-2017-12240](https://insights.sbomify.com/CVE-2017-12240/): Cisco IOS and IOS XE Software DHCP Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2017-3881](https://insights.sbomify.com/CVE-2017-3881/): Cisco IOS and IOS XE Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2017-6736](https://insights.sbomify.com/CVE-2017-6736/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2017-6737](https://insights.sbomify.com/CVE-2017-6737/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2017-6738](https://insights.sbomify.com/CVE-2017-6738/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-0167 and fix it if it is affected.

What it is: CVE-2018-0167 is a high-severity memory corruption vulnerability in Cisco Ios, published on 28 Mar 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2018-0167 in the wild since at least 3 Mar 2022.

Affected product: Cisco Ios. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2018-0167/ (Markdown: https://insights.sbomify.com/CVE-2018-0167/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-0167
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-0167
- OSV: https://osv.dev/vulnerability/CVE-2018-0167

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-0167/
Summaries are generated and may contain mistakes; the official description above is the record.