Detections
Analytics

CVE-2025-40551

critical

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.

References

https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-40551

https://www.securityweek.com/cisa-warns-of-exploited-solarwinds-notepad-microsoft-vulnerabilities/

https://www.theregister.com/2026/02/09/solarwinds_mystery_whd_attack/

https://www.securityweek.com/recent-solarwinds-flaws-potentially-exploited-as-zero-days/

https://www.bleepingcomputer.com/news/security/threat-actors-exploit-solarwinds-wdh-flaws-to-deploy-velociraptor/

https://thehackernews.com/2026/02/solarwinds-web-help-desk-exploited-for.html

https://securityaffairs.com/187761/security/attackers-abuse-solarwinds-web-help-desk-to-install-zoho-agents-and-velociraptor.html

https://www.securityweek.com/fresh-solarwinds-vulnerability-exploited-in-attacks/

https://www.infosecurity-magazine.com/news/solarwinds-web-help-desk/

https://thehackernews.com/2026/02/cisa-adds-actively-exploited-solarwinds.html

https://www.bleepingcomputer.com/news/security/cisa-flags-critical-solarwinds-rce-flaw-as-actively-exploited/

https://securityaffairs.com/187592/security/u-s-cisa-adds-solarwinds-web-help-desk-sangoma-freepbx-and-gitlab-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://thehackernews.com/2026/02/researchers-observe-in-wild.html

https://www.theregister.com/2026/02/04/critical_solarwinds_web_help_desk/

https://www.cisa.gov/news-events/alerts/2026/02/03/cisa-adds-four-known-exploited-vulnerabilities-catalog

https://www.securityweek.com/solarwinds-patches-critical-web-help-desk-vulnerabilities/

https://www.helpnetsecurity.com/2026/01/29/solarwinds-web-help-desk-rce-vulnerabilities/

https://thehackernews.com/2026/01/solarwinds-fixes-four-critical-web-help.html

https://securityaffairs.com/187470/security/solarwinds-addressed-four-critical-web-help-desk-flaws.html

https://www.bleepingcomputer.com/news/security/solarwinds-warns-of-critical-web-help-desk-rce-auth-bypass-flaws/

https://horizon3.ai/attack-research/cve-2025-40551-another-solarwinds-web-help-desk-deserialization-issue/

https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_2026-1_release_notes.htm#link6

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-40551

https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_2026-1_release_notes.htm

Details

Source: Mitre, NVD

Published: 2026-01-28

Updated: 2026-02-03

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.79316

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest