# CVE-2020-25843: CHANGING Inc. NHIServiSignAdapter Windows Versions - Heap Overflow

> Remote attackers can execute arbitrary code via a heap overflow in NHIServiSignAdapter caused by improper path length verification.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 31 Dec 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-6x24-83hx-xqw8

## What is CVE-2020-25843?

CVE-2020-25843 is a high-severity memory corruption vulnerability in CHANGING Inc. NHIServiSignAdapter, published on 31 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

NHIServiSignAdapter fails to verify the length of digital credential files’ path which leads to a heap overflow loophole. Remote attackers can use the leak to execute code without privilege.

Weakness: CWE-787 (Out-of-bounds Write), CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2020-25843?

It affects 1 product.


Products: Panorama Nhiservisignadapter.

## How do I fix CVE-2020-25843?

No fix has been published for CVE-2020-25843 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-25843 being exploited?

There is no known exploitation of CVE-2020-25843 in the wild and no public exploit code.

## Other vulnerabilities in CHANGING Inc. NHIServiSignAdapter

- [CVE-2020-25844](https://insights.sbomify.com/CVE-2020-25844/): CHANGING Inc. NHIServiSignAdapter Windows Versions - Stack Overflow (high 8.1)
- [CVE-2020-25842](https://insights.sbomify.com/CVE-2020-25842/): CHANGING Inc. NHIServiSignAdapter Windows Versions - Arbitrary File Access (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-25843 and fix it if it is affected.

What it is: CVE-2020-25843 is a high-severity memory corruption vulnerability in CHANGING Inc. NHIServiSignAdapter, published on 31 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-25843 in the wild and no public exploit code.

Affected product: CHANGING Inc. NHIServiSignAdapter. 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-2020-25843/ (Markdown: https://insights.sbomify.com/CVE-2020-25843/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-25843
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-25843
- OSV: https://osv.dev/vulnerability/CVE-2020-25843

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-25843/
Summaries are generated and may contain mistakes; the official description above is the record.