# CVE-2025-13833: Insecure TLS Fingerprint Validation in ForeScout SecureConnector Configuration Enables Remote Code Execution

Status: published. Published: 2026-10-26. Updated: 2026-11-03.

A vulnerability exists in SecureConnector for Windows when the “Additional Appliance Connections” setting is enabled and the agent’s configuration file contains more than three trusted‑server entries. Some entries omit TLS certificate fingerprints, which allows the agent to accept and establish sessions with a malicious server. An attacker who controls the wired or wireless network can redirect traffic to a malicious server. The attacker can then use the agent’s built‑in command/file features to execute arbitrary commands as SYSTEM, granting full administrative control and the ability to disable endpoint protections or exfiltrate data.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Forescout Technologies / SecureConnector: ≥ 0; < 11.3.20 (affected, custom). Source: CNA: Forescout; platforms: Windows

## Severity and prioritization

- CVSS 4.0: 7.7 (high); CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: Forescout

- CISA KEV: No listing in collected sources

- EPSS: 0.15% as of 2026-11-03; percentile 4.17%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-295

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://support.forescout.com/ (CNA: Forescout)

## Provenance

- CNA: Forescout: https://www.cve.org/CVERecord?id=CVE-2025-13833; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-13833; retrieved 2026-11-03; source updated Not reported

Revision: 7bd32f9e50fa8b8316efde363e039bce9b365dc1297edde0bb901810d9908b79

Canonical: https://y2.dev/cve/CVE-2025-13833

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