CVE-2025-40551
Published: February 3, 2026
Official Description
SolarWinds Web Help Desk contains a deserialization of untrusted data 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.
CISA KEV Advisory
SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
SolarWinds Web Help Desk contains a deserialization of untrusted data 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.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Risk Analysis
SolarWinds Web Help Desk contains a critical deserialization of untrusted data vulnerability that can lead to remote code execution without authentication. This allows an attacker to run commands on the host machine, posing a severe risk to system integrity. The CVSS score of 9.8 and high EPSS score of 0.78626 indicate a critical and highly likely to be exploited flaw, further confirmed by its presence in CISA's KEV.
This vulnerability is actively exploited in the wild, as confirmed by its presence in CISA's KEV. It is remotely exploitable by an unauthenticated attacker.
Immediately apply all available patches and updates for SolarWinds Web Help Desk. Implement network segmentation and restrict access to the Web Help Desk instance.
Technical Analysis
CVE-2025-40551 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CISA has added CVE-2025-40551 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
CVSS v3.1 Vector Breakdown
Exploit & PoC Resources
All References (2)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-40551 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1