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Web Help Desk CVE-2024-28986

CRITICAL
Deserialization of Untrusted Data (CWE-502)
2024-08-13 psirt@solarwinds.com
9.8
CVSS 3.1 · Vendor: solarwinds
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A08:2025 - Software or Data Integrity Failures
ASVS 5.0
V1 - Encoding and Sanitization Safe deserialization, type allowlists
MITRE ATT&CK

2 techniques across 2 tactics: Execution, Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Impact

CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.

Exploit ScenarioDerived

A remote attacker could execute arbitrary code through malicious serialized objects by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

Act Now Prioritize within 24-48h. Why: CRITICAL + in CISA KEV (actively exploited), no patch available.
Exploited in the wild (CISA KEV) No patch listed yet 84.6% exploitation probability (EPSS)

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AnalysisAI

SolarWinds Web Help Desk was found to be susceptible to a Java Deserialization Remote Code Execution vulnerability that, if exploited, would allow an attacker to run commands on the host machine. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Avoid deserializing untrusted data. Use safe serialization formats (JSON). Implement integrity checks and type allowlists.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Deserialization of Untrusted Data (CWE-502), which allows attackers to execute arbitrary code through malicious serialized objects. SolarWinds Web Help Desk was found to be susceptible to a Java Deserialization Remote Code Execution vulnerability that, if exploited, would allow an attacker to run commands on the host machine. While it was reported as an unauthenticated vulnerability, SolarWinds has been unable to reproduce it without authentication after thorough testing. However, out of an abundance of caution, we recommend all Web Help Desk customers apply the patch, which is now available. Affected products include: Solarwinds Web Help Desk.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (solarwinds) PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from Vendor (solarwinds) · only source for this CVE.

CVSS VectorVendor: solarwinds

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Added to CISA KEV
Jul 14, 2026 - 04:22 CISA
CVE Published
Aug 13, 2024 - 23:15 cve.org
CRITICAL 9.8

DescriptionCVE.org

SolarWinds Web Help Desk was found to be susceptible to a Java Deserialization Remote Code Execution vulnerability that, if exploited, would allow an attacker to run commands on the host machine.

While it was reported as an unauthenticated vulnerability, SolarWinds has been unable to reproduce it without authentication after thorough testing.

However, out of an abundance of caution, we recommend all Web Help Desk customers apply the patch, which is now available.

Threat Intelligence Overview

EPSS Score
84.6%
Top 0% exploitable
Exploit
POC
Public exploit code exists
Data Quality
2 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV Yes
Public POC Yes
EPSS 84.6%
Patch available No
Active threat Yes
Deciding rule
CRITICAL + in CISA KEV (actively exploited), no patch available
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Immediate
Exploitation· derived
Active
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
High

Priority Score

204
Low Medium High Critical
KEV: +50
EPSS: +85
CVSS: +49
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Insecure deserialization occurs when an application converts serialized data (a stream of bytes representing an object's state) back into a living object without proper validation.

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)CVE.org

cpe:2.3:a:solarwinds:web_help_desk:*:*:*:*:*:*:*:*
cpe:2.3:a:solarwinds:web_help_desk:12.8.3:-:*:*:*:*:*:*
CVE-2025-40551 CRITICAL POC
9.8 Jan 28

SolarWinds Web Help Desk contains an unauthenticated Java deserialization vulnerability (CVE-2025-40551, CVSS 9.8) that

CVE-2025-40536 HIGH POC
8.1 Jan 28

SolarWinds Web Help Desk contains a security control bypass vulnerability (CVE-2025-40536) that allows unauthenticated a

CVE-2025-26399 CRITICAL POC
9.8 Sep 23

SolarWinds Web Help Desk contains an unauthenticated deserialization RCE via AjaxProxy, a patch bypass of both CVE-2024-

CVE-2025-40552 CRITICAL POC
9.8 Jan 28

SolarWinds Web Help Desk has an authentication bypass vulnerability (EPSS 9.9%) that allows unauthenticated attackers to

CVE-2025-40554 CRITICAL POC
9.8 Jan 28

SolarWinds Web Help Desk has a second authentication bypass (EPSS 7.8%) providing yet another path to unauthenticated ad

CVE-2024-28987 CRITICAL POC
9.1 Aug 21

The SolarWinds Web Help Desk (WHD) software is affected by a hardcoded credential vulnerability, allowing remote unauthe

CVE-2025-40553 CRITICAL POC
9.8 Jan 28

SolarWinds Web Help Desk has a second deserialization vulnerability (EPSS 11.9%) providing another unauthenticated RCE p

CVE-2024-28988 CRITICAL
9.8 Sep 01

SolarWinds Web Help Desk was found to be susceptible to a Java Deserialization Remote Code Execution vulnerability that,

CVE-2026-28323 CRITICAL
9.8 Jul 30

Authentication bypass in SolarWinds Web Help Desk (WHD) allows remote unauthenticated attackers to circumvent SAML 2.0 s

CVE-2026-28299 HIGH
7.5 Jun 02

Denial-of-service in SolarWinds Web Help Desk (2026.1 and all prior versions) lets remote unauthenticated attackers exha

CVE-2025-40537 HIGH
7.5 Jan 28

SolarWinds Web Help Desk was found to be susceptible to a hardcoded credentials vulnerability that, under certain situat

CVE-2021-35243 HIGH
7.5 Dec 23

The HTTP PUT and DELETE methods were enabled in the Web Help Desk web server (12.7.7 and earlier), allowing users to exe

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