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CVE-2025-40553

71
FAUCET Score

CVE-2025-40553 is a critical untrusted data deserialization vulnerability affecting SolarWinds Web Help Desk, allowing unauthenticated remote code execution. With a CVSS score of 9.8, this flaw enables attackers to fully compromise the host system without prior authentication. While there is no confirmed active exploitation, the vulnerability has garnered significant community discussion and media attention, indicating high awareness and potential for future exploitation. Although no public exploit code is currently available, its high EPSS score suggests a higher-than-average likelihood of exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< 2026.1CPE matchmatch criteria
cpe:2.3:a:solarwinds:web_help_desk:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
60.39%
Probability of exploitation in next 30 days
EPSS Percentile
99.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.6039 is in the 97th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

applepatch availablevia llm_extracted
Fixed in: 12.8.8 HF2

Vendor Advisories (1)

applellm-apple-75dc4d41685d3ba8CRITICAL

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

Jan 28, 2026

References

github.com / watchtowrlabs/watchTowr-vs-SolarWinds-WebHelpDesk-CVE-2025-40552-CVE-2025-40553/blob/main/watchTowr-vs-SolarWinds-WebHelpDesk-CVE-2025-40552-CVE-2025-40553.py
documentation.solarwinds.com / en/success_center/whd/content/release_notes/whd_2026-1_release_notes.htm
Release Notes
solarwinds.com / trust-center/security-advisories/CVE-2025-40553
Vendor Advisory