CVE-2024-28986: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

CVE-2024-28986 is a deserialization of untrusted data vulnerability in SolarWinds Web Help Desk. According to CISA, it could allow remote code execution. This matters because Web Help Desk often sits in IT support environments with access to tickets, assets, and internal systems; successful abuse can give an attacker a foothold for further activity. Confirm all version, configuration, and fix details against the vendor advisory.

How it works

The flaw is classified as CWE-502: deserialization of untrusted data. In this class of weakness, an application accepts serialized objects or data from a source it does not fully control and reconstructs them into live objects without adequate validation. When that process is unsafe, an attacker who can supply crafted input may influence what code runs during or after deserialization.

For SolarWinds Web Help Desk, public detail describes the outcome as possible remote code execution. Exact request paths, object types, or exploit mechanics are not provided here; treat any such claims as unverified until you review the vendor advisory and your own testing. In general, deserialization issues are abused by sending specially formed data that the application processes in a privileged context, potentially leading to arbitrary code execution under the service account.

Am I affected? How to find it in your systems

SolarWinds Web Help Desk is typically deployed as an on-premises or self-hosted IT service management / help-desk application used by internal support teams. It may run on Windows servers and is often reachable from the corporate network or, in some cases, from the internet if exposed for remote support.

• Inventory: Search asset management, CMDB, software inventory, and vulnerability scanners for “SolarWinds Web Help Desk” or related package names. Check application servers, virtual machines, and containers that host help-desk or ITSM tooling.
• Version and configuration: Identify the installed release and any hotfixes. Compare them only against the vendor advisory for CVE-2024-28986; do not rely on third-party version lists that may be incomplete.
• Exposure: Note whether the service is internet-facing, reachable from untrusted networks, or protected by authentication and network controls.
• Telemetry signs: Look for unusual process creation, unexpected child processes of the Web Help Desk service, anomalous network connections from the host, or spikes in deserialization-related errors in application logs. These are generic indicators for this weakness class; specific log signatures must be confirmed with the vendor or your own baselining.

How to remediate

Patch first. Apply the mitigations and updates provided by SolarWinds for this vulnerability, following the vendor instructions exactly. CISA’s required action is to apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

• Confirm the fixed package or configuration change against the official advisory before deploying widely.
• After patching, restart services as directed and verify the version or build string matches the remediated release.
• For the broader class: reduce the attack surface by ensuring the application does not accept untrusted serialized input where possible, keep the service account least-privileged, and restrict network access to the management interfaces.

If you can't patch immediately

Until the vendor update can be applied, reduce risk with compensating controls:

• Network segmentation: Limit access to Web Help Desk to only necessary internal subnets and authenticated users; block direct internet exposure if it is not required.
• Virtual patching / WAF: If you have a web application firewall or reverse proxy, apply rules that restrict or inspect traffic to the application’s endpoints. Treat any rule set as temporary and validate it does not break legitimate workflows.
• Feature and account hardening: Disable unused interfaces or remote-access features if the product allows it; enforce strong authentication and review service account privileges.
• Monitoring: Increase logging and alerting on the host and application for process creation, outbound connections, and authentication anomalies. Retain logs so you can investigate later.
• If no effective mitigation exists, plan to discontinue use of the product as stated in the CISA guidance until a fix is available.

If your data may have been exposed

Actively exploited vulnerabilities of this type can lead to unauthorized access and data exposure. Known ransomware use is not documented for this CVE. If you suspect compromise, follow your incident-response process: isolate affected systems, preserve evidence, and assess what data the help-desk application could have accessed. You can also run a free exposure scan of your email addresses against known breach data to check whether credentials or personal information associated with your organization already appear in public breach collections.