How to fix CVE-2025-40553?

Within 24 hours: Identify all SolarWinds Web Help Desk instances in production and isolate affected systems from untrusted networks. Implement network segmentation and restrict access to administrative interfaces. Within 7 days: Deploy network-based mitigations (WAF rules blocking deserialization payloads), disable remote access features if not business-critical, and enable enhanced logging and monitoring. Within 30 days: Evaluate alternative help desk solutions, prepare for vendor patch deployment, and conduct security assessment of affected systems for signs of compromise.

Is Deserialization affected by CVE-2025-40553?

A critical remote code execution vulnerability in SolarWinds Web Help Desk allows unauthenticated attackers to execute arbitrary commands on affected systems. Organizations using this product face immediate risk of system compromise, data theft, and operational disruption.

CVE-2025-40553

CRITICAL

2026-01-28 [email protected]

9.8

CVSS 3.1

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 28, 2026 - 08:16 nvd

CRITICAL 9.8

Description

SolarWinds Web Help Desk was found to be susceptible to an untrusted data deserialization vulnerability that could lead to remote code execution, which would allow an attacker to run commands on the host machine. This could be exploited without authentication.

Analysis

SolarWinds Web Help Desk has a second deserialization vulnerability (EPSS 11.9%) providing another unauthenticated RCE path alongside CVE-2025-40551.

Technical Context

A separate CWE-502 deserialization vulnerability in SolarWinds WHD, distinct from CVE-2025-40551 but with the same impact: unauthenticated remote code execution through crafted serialized objects.

Affected Products

['SolarWinds Web Help Desk']

Remediation

Apply patches for all four WHD vulnerabilities.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +11.9

CVSS: +49

POC: 0

CVE-2025-40553 vulnerability details – vuln.today

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CVE-2025-40553

CVSS Vector

Lifecycle Timeline

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Description

Analysis

Technical Context

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CVE-2025-40553

CVSS Vector

Lifecycle Timeline

Tags

Description

Analysis

Technical Context

Affected Products

Remediation

Priority Score

Share

External POC / Exploit Code