How severe is CVE-2025-40553?

CVE-2025-40553 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-2025-40553 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 60% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-40553?

CVE-2025-40553 affects Solarwinds Web Help Desk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-40553?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-40553 have an EU (EUVD) identifier?

Yes. CVE-2025-40553 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206482.

When was CVE-2025-40553 published?

CVE-2025-40553 was published on 2026-01-28 and last updated on 2026-06-17.

CVE-2025-40553

CVE-2025-40553 is a critical-severity vulnerability in Solarwinds Web Help Desk with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 60% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 60% (99th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-206482
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-2025-40553?: 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 without authentication.
How severe is CVE-2025-40553?: CVE-2025-40553 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-2025-40553 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 60% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-40553?: CVE-2025-40553 affects Solarwinds Web Help Desk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-40553?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-40553 have an EU (EUVD) identifier?: Yes. CVE-2025-40553 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206482.
When was CVE-2025-40553 published?: CVE-2025-40553 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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