What is CVE-2025-40553?

CVE-2025-40553 is a critical-severity vulnerability in Solarwinds Web Help Desk, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-01-28.

How severe is CVE-2025-40553?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Solarwinds Web Help Desk

CVE-2025-40553

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 wi…

Vulnerability class: Insecure Deserialization

EPSS: 0.174 (95.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Solarwinds Web Help Desk — versions 12.8.8 HF1 and below

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

Frequently asked questions

What is CVE-2025-40553?: CVE-2025-40553 is a critical-severity vulnerability in Solarwinds Web Help Desk, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-01-28.
How severe is CVE-2025-40553?: Critical severity. CVSS v3 base score is 9.8 out of 10.