How severe is CVE-2025-40551?

CVE-2025-40551 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-40551 being actively exploited?

Yes. CVE-2025-40551 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-02-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2025-40551?

CVE-2025-40551 affects Solarwinds Web Help Desk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-40551?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2025-40551 have an EU (EUVD) identifier?

Yes. CVE-2025-40551 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206426. It is also flagged as exploited in the EUVD (since 2026-02-03).

When was CVE-2025-40551 published?

CVE-2025-40551 was published on 2026-01-28 and last updated on 2026-06-17.

CVE-2025-40551

CVE-2025-40551 is a critical-severity vulnerability in Solarwinds Web Help Desk with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-02-03). The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 84% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-02-03)
EU (EUVD) id: EUVD-2025-206426
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-02-03)
Weakness: CWE-502
Affected product: Solarwinds Web Help Desk
Published: 2026-01-28
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-40551?: 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.
How severe is CVE-2025-40551?: CVE-2025-40551 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-40551 being actively exploited?: Yes. CVE-2025-40551 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-02-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2025-40551?: CVE-2025-40551 affects Solarwinds Web Help Desk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-40551?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2025-40551 have an EU (EUVD) identifier?: Yes. CVE-2025-40551 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206426. It is also flagged as exploited in the EUVD (since 2026-02-03).
When was CVE-2025-40551 published?: CVE-2025-40551 was published on 2026-01-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:solarwinds:web_help_desk:*:*:*:*:*:*:*:*

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