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Back to active CVEs
Critical · CVSS 9.8Known ExploitedCVE-2025-40551

SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution VulnerabilityCVE-2025-40551

Answer in brief

CVE-2025-40551 records a Critical severity (CVSS 9.8) vulnerability in SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability. The current sources mark it as known exploited. The current feed maps SolarWinds/Web Help Desk (generic), SolarWinds/Web Help Desk (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jan 28, 2026Updated Oct 7, 2026Source checked Nov 1, 2026First seen by HOL May 24, 2026Material review Oct 7, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.8. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps SolarWinds/Web Help Desk (generic), SolarWinds/Web Help Desk (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
SolarWinds/Web Help Deskgeneric*Not reported
SolarWinds/Web Help Deskgeneric12.8.8 HF1 and belowNot reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for SolarWinds/Web Help Desk, SolarWinds/Web Help Desk.
  2. 2Review the reported fix. Source-reported solution: SolarWinds recommends customers upgrade to Web Help Desk version 2026.1.

Evidence timeline and material changes

  1. Published upstream

    Jan 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    May 24, 2026

  4. Added to CISA KEV

    Feb 3, 2026

    Evidence: source:kev:kev:kev:record

Sources and claim methodology

  • Source referencedocumentation.solarwinds.com
  • CISA Known Exploited Vulnerabilities catalogcisa.gov
  • Source referencesolarwinds.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Apache MINA: Unsafe Deserialization (CWE-502) in JavaNativeMessageDecoderAlso CWE-502

Record context

Vulnerability class
Deserialization
EPSS
Not reported
CWE IDs
CWE-502
Source
CVE List V5
Source checked
Nov 1, 2026
References
3 linked sources
Open source record