CVE-2025-40551 (GCVE-0-2025-40551)
Vulnerability from cvelistv5 – Published: 2026-01-28 07:33 – Updated: 2026-02-26 15:04Title
SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability
Summary
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.
Severity
9.8 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-04 04:55 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.solarwinds.com/trust-center/security-… | vendor-advisorypatch |
| https://documentation.solarwinds.com/en/success_c… | release-notes |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| SolarWinds | Web Help Desk |
Affected:
12.8.8 HF1 and below
|
guessed |
Date Public
2026-01-28 07:32
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4577b5cf-4984-471a-9b66-88042214d56f
Exploited: Yes
Timestamps
First Seen: 2026-02-03
Asserted: 2026-02-03
Scope
Notes: KEV entry: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability | Affected: SolarWinds / Web Help Desk | Description: SolarWinds Web Help Desk contains a deserialization of untrusted data 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. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-02-06 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://www.solarwinds.com/trust-center/security-advisories/cve-2025-40551 ; https://nvd.nist.gov/vuln/detail/CVE-2025-40551
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-502 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Web Help Desk |
| Due Date | 2026-02-06 |
| Date Added | 2026-02-03 |
| Vendorproject | SolarWinds |
| Vulnerabilityname | SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-04 08:04 UTC
| Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 3fcf1809-f930-4634-95e3-fa483c2dc827
Exploited: Yes
Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability | Affected: SolarWinds / Web Help Desk | CVSS: 9.8 (CRITICAL) | EPSS: 0.8413 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability |
| Vendor | SolarWinds |
| Product | Web Help Desk |
| Added Date | 2026-06-01T10:50:18.579Z |
| Cvss Score | 9.8 |
| Epss Score | 0.8413 |
| Cvss Severity | CRITICAL |
| Epss Percentile | 0.99662 |
| Used In Malware | unknown |
| Ahead Of Cisa Kev |
|
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:03 UTC
| Updated: 2026-07-10 06:14 UTC
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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