IIS
CVE-2026-26333
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Calero VeraSMART versions prior to 2022 R1 expose an unauthenticated .NET Remoting HTTP service on TCP port 8001. The service publishes default ObjectURIs (including EndeavorServer.rem and RemoteFileReceiver.rem) and permits the use of SOAP and binary formatters with TypeFilterLevel set to Full. An unauthenticated remote attacker can invoke the exposed remoting endpoints to perform arbitrary file read and write operations via the WebClient class. This allows retrieval of sensitive files such as WebRoot\\web.config, which may disclose IIS machineKey validation and decryption keys. An attacker can use these keys to generate a malicious ASP.NET ViewState payload and achieve remote code execution within the IIS application context. Additionally, supplying a UNC path can trigger outbound SMB authentication from the service account, potentially exposing NTLMv2 hashes for relay or offline cracking.
AnalysisAI
Unauthenticated .NET Remoting endpoint in Calero VeraSMART before 2022 R1. TCP port 8001 exposes default Object URIs enabling deserialization attacks. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Calero VeraSMART versions prior to 2022 R1 with unauthenticated .NET Remoting HTTP service enabled on TCP port 8001, publishing default ObjectURIs (EndeavorServer.rem, RemoteFileReceiver.rem) with TypeFilterLevel set to Full allowing SOAP and binary formatters. Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 9.8. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Attacker connects to TCP 8001, exploits .NET Remoting deserialization for RCE. |
| Remediation | Update to 2022 R1. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and inventory all Calero VeraSMART deployments, document versions, and assess network exposure of port 8001. …
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External POC / Exploit Code
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