# CVE-2018-17974: Memory corruption in n/a

> A heap-based buffer over-read in Tcpreplay allows attackers to cause a denial of service via crafted packets.

- **Severity:** Medium 5.5 (`CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 3 Oct 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-17974, GHSA-x28p-fjp4-h4m4, UBUNTU-CVE-2018-17974

## What is CVE-2018-17974?

CVE-2018-17974 is a medium-severity memory corruption vulnerability in Broadcom Tcpreplay, published on 3 Oct 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

An issue was discovered in Tcpreplay 4.3.0 beta1. A heap-based buffer over-read was triggered in the function dlt_en10mb_encode() of the file plugins/dlt_en10mb/en10mb.c, due to inappropriate values in the function memmove(). The length (pktlen + ctx -> l2len) can be larger than source value (packet + ctx->l2len) because the function fails to ensure the length of a packet is valid. This leads to Denial of Service.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2018-17974?

It affects 1 product.


Products: Broadcom Tcpreplay.

## How do I fix CVE-2018-17974?

Upgrade to a fixed version.

## Is CVE-2018-17974 being exploited?

There is no known exploitation of CVE-2018-17974 in the wild and no public exploit code.

## Other vulnerabilities in Broadcom Tcpreplay

- [CVE-2018-18408](https://insights.sbomify.com/CVE-2018-18408/): Use after free in n/a (critical 9.8)
- [CVE-2020-12740](https://insights.sbomify.com/CVE-2020-12740/): Memory corruption in n/a (critical 9.1)
- [CVE-2025-51006](https://insights.sbomify.com/CVE-2025-51006/): Use after free in n/a (high 7.8)
- [CVE-2022-37047](https://insights.sbomify.com/CVE-2022-37047/): Memory corruption in n/a (high 7.8)
- [CVE-2022-37048](https://insights.sbomify.com/CVE-2022-37048/): Memory corruption in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-17974 and fix it if it is affected.

What it is: CVE-2018-17974 is a medium-severity memory corruption vulnerability in Broadcom Tcpreplay, published on 3 Oct 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-17974 in the wild and no public exploit code.

Affected product: Broadcom Tcpreplay. 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-2018-17974/ (Markdown: https://insights.sbomify.com/CVE-2018-17974/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-17974
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-17974
- OSV: https://osv.dev/vulnerability/CVE-2018-17974

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-17974/
Summaries are generated and may contain mistakes; the official description above is the record.