CVE-2025-40551

ENISA EUVD: EUVD-2025-206426 ↗
Exploited in the Wild ✓ Confirmed 0-Day
Triaged: March 5, 2026 5 articles Published: 2026-01-28
VulnLookup ↗ NVD ↗ EUVD ↗ MITRE ↗ CISA KEV ↗

EPSS Score

Source: FIRST.org · 2026-05-23
86.97%
probability
This CVE has a 86.97% probability of being exploited in the next 30 days.
0% Top 99.4th percentile of all CVEs 100%

CVSS v3.1

Source: VulnerabilityLookup (CIRCL)
9.8
CRITICAL
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

VulnerabilityLookup (CNA)
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.

Affected Products

SolarWinds
Web Help Desk
12.8.8 HF1 and below

Attack Intelligence

Signal Intelligence

Confidenceⓘ
95%
EPSS 86.97%
CVSS v3.1 9.8
Mentions 5
Last Seen Feb 13, 2026

CNA Information

CNA Assigner
SolarWinds
CNA Title
SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability

Analyst Note

CVE-2025-40551 shows clear zero-day indicators: active exploitation documented in the wild (Microsoft observed multi-stage attacks), CISA added it to KEV catalog as actively exploited, and the CVE was published 2026-01-28 with exploitation occurring before or concurrent with patch availability. The critical CVSS 9.8 unauthenticated RCE combined with documented real-world attacks confirms zero-day status.

Threat Actors 4

APT 28
apt_group Information theft and espionage 🇷🇺 RU
TAG-28
apt_group Information theft and espionage 🇨🇳 CN
Roaming Tiger
apt_group Information theft and espionage 🇨🇳 CN
White Bear
apt_group Information theft and espionage 🇷🇺 RU

Triage Info

Decided atMar 05, 2026
Published DateJan 28, 2026