CVE entry · CVE-2025-40551
CVE-2025-40551: 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.
- Actively exploited: added to CISA’s KEV catalog on February 3, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: February 6, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes SolarWinds Web Help Desk, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (www.solarwinds.com)
- NVD entry (NIST)
- CISA KEV catalog