CVE-2025-55139 Overview
CVE-2025-55139 is a Server-Side Request Forgery (SSRF) vulnerability [CWE-918] affecting Ivanti Connect Secure, Policy Secure, ZTA Gateway, and Neurons for Secure Access. A remote authenticated attacker with administrative privileges can abuse the flaw to enumerate internal services reachable from the appliance. Ivanti addressed the issue across multiple product lines, with a fix deployed on 02-Aug-2025 for Neurons for Secure Access.
Critical Impact
An authenticated administrator can pivot through the gateway to probe internal network services that are not intended to be reachable from the appliance's management interface.
Affected Products
- Ivanti Connect Secure before 22.7R2.9 or 22.8R2
- Ivanti Policy Secure before 22.7R1.6
- Ivanti ZTA Gateway before 2.8R2.3-723 and Ivanti Neurons for Secure Access before 22.8R1.4
Discovery Timeline
- 02-Aug-2025 - Fix deployed for Ivanti Neurons for Secure Access
- 2025-09-09 - CVE-2025-55139 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-55139
Vulnerability Analysis
The vulnerability is a Server-Side Request Forgery (SSRF) weakness classified under [CWE-918]. An authenticated administrator can supply a crafted URL or host reference to a vulnerable endpoint on the appliance. The appliance then issues outbound requests on the attacker's behalf, disclosing whether targeted internal services respond.
The practical effect is internal service enumeration. Response timing, status codes, and error messages reveal live hosts, open ports, and reachable applications behind the appliance. This information supports lateral movement planning even though the flaw itself does not directly return sensitive data or modify state.
Exploitation requires valid administrative credentials, which limits the attack population. However, Ivanti gateways are frequent targets, and stolen or reused administrator credentials remain a realistic prerequisite in many intrusions.
Root Cause
The affected components accept URL or host input from administrative functionality without adequately validating that the destination corresponds to an approved external endpoint. Because the request originates from the appliance itself, it inherits network reachability that external clients do not have. Ivanti has not published low-level technical detail on the specific parameter or handler.
Attack Vector
The attack vector is network-based and requires authentication as an administrator. The attacker interacts with an administrative feature that accepts a remote resource reference, then substitutes internal targets such as http://127.0.0.1:<port>, RFC1918 addresses, or internal DNS names. The appliance's response behavior discloses whether the targeted service exists.
No verified proof-of-concept code is publicly available. Refer to the Ivanti September Security Advisory for vendor-provided details.
Detection Methods for CVE-2025-55139
Indicators of Compromise
- Outbound HTTP or HTTPS connections from the Ivanti appliance targeting internal RFC1918 addresses, loopback, or link-local ranges that fall outside normal update and telemetry destinations.
- Administrative session activity followed by clusters of short-lived outbound connection attempts to sequential internal ports.
- Unexpected DNS lookups from the appliance for internal hostnames unrelated to its documented functions.
Detection Strategies
- Baseline the appliance's normal outbound destinations and alert on deviations, particularly connections to internal subnets not required for operation.
- Correlate administrator authentication events with subsequent outbound request patterns from the same appliance.
- Inspect appliance access and audit logs for administrative API calls containing URL parameters that reference internal IP ranges.
Monitoring Recommendations
- Forward Ivanti appliance audit logs to a centralized SIEM and retain administrative action history for correlation.
- Monitor firewall telemetry for egress from the appliance's management interface to internal segments.
- Track administrator account usage, including source IPs, session duration, and configuration changes, to identify credential misuse.
How to Mitigate CVE-2025-55139
Immediate Actions Required
- Upgrade Ivanti Connect Secure to 22.7R2.9 or 22.8R2, Policy Secure to 22.7R1.6, ZTA Gateway to 2.8R2.3-723, and Neurons for Secure Access to 22.8R1.4 or later.
- Rotate administrative credentials on affected appliances and audit administrative account membership.
- Review recent administrative activity for evidence of internal enumeration attempts.
Patch Information
Ivanti has released fixed builds for each affected product line. The Neurons for Secure Access fix was deployed on 02-Aug-2025. Full remediation guidance and version details are published in the Ivanti September Security Advisory.
Workarounds
- Restrict access to the administrative interface to a dedicated management network and a limited set of source IPs.
- Enforce multi-factor authentication for all administrator accounts on affected appliances.
- Apply egress filtering so the appliance can only reach documented external destinations required for updates and telemetry.
# Example egress restriction concept (adapt to your firewall syntax)
# Allow appliance egress only to approved Ivanti update endpoints
# Deny appliance-initiated traffic to internal RFC1918 ranges
deny from <ivanti_appliance_ip> to 10.0.0.0/8
deny from <ivanti_appliance_ip> to 172.16.0.0/12
deny from <ivanti_appliance_ip> to 192.168.0.0/16
allow from <ivanti_appliance_ip> to <approved_update_hosts>
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
