# CVE-2017-12704: Memory corruption in Advantech WebAccess

> Heap-based buffer overflow in Advantech WebAccess allows attackers to execute arbitrary code via improper validation of user-supplied data length.

- **Severity:** High 8.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 30 Aug 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-h9cj-757c-fm2v

## What is CVE-2017-12704?

CVE-2017-12704 is a high-severity memory corruption vulnerability in Advantech Webaccess, published on 30 Aug 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A heap-based buffer overflow issue was discovered in Advantech WebAccess versions prior to V8.2_20170817. Researchers have identified multiple vulnerabilities where there is a lack of proper validation of the length of user-supplied data prior to copying it to the heap-based buffer, which could allow an attacker to execute arbitrary code under the context of the process.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2017-12704?

It affects 1 product.


Products: Advantech Webaccess.

## How do I fix CVE-2017-12704?

No fix has been published for CVE-2017-12704 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-12704 being exploited?

There is no known exploitation of CVE-2017-12704 in the wild and no public exploit code.

## Other vulnerabilities in Advantech Webaccess

- [CVE-2014-9208](https://insights.sbomify.com/CVE-2014-9208/): Multiple stack-based buffer overflows in unspecified DLL files in Advantech WebAccess before 8.0.1 allow remote attackers to execute arbitra (critical 10.0)
- [CVE-2021-33023](https://insights.sbomify.com/CVE-2021-33023/): Advantech WebAccess (critical 9.8)
- [CVE-2021-38389](https://insights.sbomify.com/CVE-2021-38389/): Advantech WebAccess (critical 9.8)
- [CVE-2021-38408](https://insights.sbomify.com/CVE-2021-38408/): Memory corruption in Advantech WebAccess (critical 9.8)
- [CVE-2020-12019](https://insights.sbomify.com/CVE-2020-12019/): Memory corruption in WebAccess Node (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-12704 and fix it if it is affected.

What it is: CVE-2017-12704 is a high-severity memory corruption vulnerability in Advantech Webaccess, published on 30 Aug 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2017-12704 in the wild and no public exploit code.

Affected product: Advantech Webaccess. 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-2017-12704/ (Markdown: https://insights.sbomify.com/CVE-2017-12704/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-12704
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-12704
- OSV: https://osv.dev/vulnerability/CVE-2017-12704

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-12704/
Summaries are generated and may contain mistakes; the official description above is the record.