How severe is CVE-2025-34489?

CVE-2025-34489 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-34489 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-34489?

CVE-2025-34489 affects Gfi Mailessentials. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-34489?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-34489 have an EU (EUVD) identifier?

Yes. CVE-2025-34489 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14685.

When was CVE-2025-34489 published?

CVE-2025-34489 was published on 2025-04-28 and last updated on 2026-06-17.

CVE-2025-34489

CVE-2025-34489 is a high-severity vulnerability in Gfi Mailessentials with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-14685
Weakness: CWE-502
Affected product: Gfi Mailessentials
Published: 2025-04-28
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-34489?: 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.
How severe is CVE-2025-34489?: CVE-2025-34489 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-34489 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-34489?: CVE-2025-34489 affects Gfi Mailessentials. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-34489?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-34489 have an EU (EUVD) identifier?: Yes. CVE-2025-34489 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14685.
When was CVE-2025-34489 published?: CVE-2025-34489 was published on 2025-04-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:gfi:mailessentials:*:*:*:*:*:*:*:*

More vulnerabilities in Gfi Mailessentials

CVE-2004-1312 — Critical (CVSS 10.0): A bug in the HTML parser in a certain Microsoft HTML library, as used in various third party products, may allow remote…
CVE-2025-34491 — High (CVSS 8.8): GFI MailEssentials prior to version 21.8 is vulnerable to a .NET deserialization issue. A remote and authenticated…
CVE-2025-34490 — Medium (CVSS 6.5): GFI MailEssentials prior to version 21.8 is vulnerable to an XML External Entity (XXE) issue. An authenticated and…
CVE-2026-23619 — Medium (CVSS 5.4): GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Local Domains…
CVE-2026-23618 — Medium (CVSS 5.4): GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Spam Keyword…
CVE-2026-23617 — Medium (CVSS 5.4): GFI MailEssentials AI versions prior to 22.4 contain a stored cross-site scripting vulnerability in the Spam Keyword…

All CVEs affecting Gfi Mailessentials →

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities

CVE-2026-41104 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Planetary Computer Pro allows an unauthorized attacker to disclose…
CVE-2026-43633 — Critical (CVSS 10.0): HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a…
CVE-2026-33819 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
CVE-2026-20131 — Critical (CVSS 10.0): A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could…
CVE-2026-25632 — Critical (CVSS 10.0): EPyT-Flow is a Python package designed for the easy generation of hydraulic and water quality scenario data of water…
CVE-2025-14931 — Critical (CVSS 10.0): Hugging Face smolagents Remote Python Executor Deserialization of Untrusted Data Remote Code Execution Vulnerability.…

Browse all CWE-502 (Deserialization of Untrusted Data) vulnerabilities →