# CVE-2025-34489: GFI MailEssentials < 21.8 Local Privilege Escalation

> A local attacker can escalate privileges to SYSTEM by sending a crafted serialized payload to the .NET Remoting Service in GFI MailEssentials.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Apr 2025
- **Updated:** 19 Nov 2025
- **Also known as:** GHSA-6h6j-8576-v4xg

## What is CVE-2025-34489?

CVE-2025-34489 is a high-severity unsafe deserialization vulnerability in GFI MailEssentials, published on 28 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

GFI MailEssentials prior to version 21.8 is vulnerable to a local privilege escalation issue. A local attacker can escalate to NT Authority/SYSTEM by sending a crafted serialized payload to a .NET Remoting Service.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2025-34489?

It affects 1 product.


Products: Gfi Mailessentials.

## How do I fix CVE-2025-34489?

No fix has been published for CVE-2025-34489 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-34489 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34489 exists.

## Other vulnerabilities in GFI MailEssentials

- [CVE-2004-1312](https://insights.sbomify.com/CVE-2004-1312/): Denial of service in n/a (critical 10.0)
- [CVE-2025-34491](https://insights.sbomify.com/CVE-2025-34491/): GFI MailEssentials < 21.8 MultiNode Insecure Deserialization (high 8.8)
- [CVE-2025-34490](https://insights.sbomify.com/CVE-2025-34490/): GFI MailEssentials < 21.8 XXE Arbitrary File Read (medium 6.5)
- [CVE-2026-23620](https://insights.sbomify.com/CVE-2026-23620/): GFI MailEssentials AI < 22.4 ListServer.IsDBExist() Absolute Directory Traversal to File Enumeration (medium 5.3)
- [CVE-2026-23621](https://insights.sbomify.com/CVE-2026-23621/): GFI MailEssentials AI < 22.4 ListServer.IsPathExist() Absolute Directory Traversal to File Enumeration (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-34489 and fix it if it is affected.

What it is: CVE-2025-34489 is a high-severity unsafe deserialization vulnerability in GFI MailEssentials, published on 28 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34489 exists.

Affected product: GFI MailEssentials. 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-2025-34489/ (Markdown: https://insights.sbomify.com/CVE-2025-34489/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-34489
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-34489
- OSV: https://osv.dev/vulnerability/CVE-2025-34489

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-34489/
Summaries are generated and may contain mistakes; the official description above is the record.