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PatchSiren cyber security CVE debrief

CVE-2025-40551 SolarWinds CVE debrief

CVE-2025-40551 is a SolarWinds Web Help Desk deserialization of untrusted data issue that CISA added to its Known Exploited Vulnerabilities catalog on 2026-02-03. Because CISA has set a remediation due date of 2026-02-06, organizations using the product should treat this as a time-sensitive remediation item and follow vendor guidance immediately.

Vendor
SolarWinds
Product
Web Help Desk
CVSS
CRITICAL 9.8
CISA KEV
Listed
Original CVE published
2026-02-03
Original CVE updated
2026-02-03
Advisory published
2026-02-03
Advisory updated
2026-02-03

Who should care

Security teams, IT administrators, and asset owners responsible for SolarWinds Web Help Desk deployments should prioritize this CVE, especially where the product is internet-facing or broadly reachable inside the environment.

Technical summary

The available source data identifies the issue as a deserialization of untrusted data vulnerability in SolarWinds Web Help Desk. The CISA KEV entry confirms it is a known exploited vulnerability and links to the vendor advisory and NVD record for further remediation details. No additional technical specifics are provided in the supplied corpus.

Defensive priority

High. CISA KEV inclusion and the short remediation window indicate urgent action is warranted.

Recommended defensive actions

  • Review the SolarWinds security advisory for CVE-2025-40551 and apply the vendor-recommended mitigations or updates as soon as possible.
  • Follow CISA guidance for known exploited vulnerabilities and complete remediation by the stated due date if feasible.
  • If mitigations are unavailable, consider discontinuing use of the product until a supported remediation path is in place.
  • Inventory all SolarWinds Web Help Desk deployments to confirm exposure and ownership.
  • Validate after remediation that the product is updated and that compensating controls are in place where needed.

Evidence notes

This debrief is based only on the supplied CISA KEV source item, which names SolarWinds Web Help Desk, identifies the vulnerability as a deserialization of untrusted data issue, marks it as a known exploited vulnerability, and provides the vendor advisory and NVD links. Published and modified dates used here are the provided 2026-02-03 timeline values.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-40551 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-40551

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-40551 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-40551

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.