Ivanti Gateway Stack-Based Buffer Overflow (CVE-2025-22457)

Historical catalog analysis: CISA added this entry on April 04, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.

What the vulnerability is

CVE-2025-22457 is a stack-based buffer overflow (CWE-121) affecting Ivanti gateway appliances. This flaw allows a remote, unauthenticated attacker to execute arbitrary code on the target system. The vulnerability has been identified as being used in known ransomware campaigns.

Exposure and applicability

This vulnerability applies to organizations deploying the following Ivanti products:
* Connect Secure
* Policy Secure
* ZTA Gateways

Exposure is high for these assets because the exploit does not require prior authentication, meaning any gateway exposed to the internet or untrusted network segments is a potential entry point for remote code execution.

Potential breach-prevention strategy

Because this vulnerability has been linked to ransomware campaigns, we analyze how similar compromises could be mitigated. The reported entry path is a remote unauthenticated request triggering a buffer overflow; however, the specific packet structure and delivery mechanism remain unknown based on available data.

Our conditional analysis suggests the following prioritized actions:

1. Immediate Patching/Mitigation: To prevent initial access, infrastructure owners should apply vendor-supplied mitigations. This addresses the root vulnerability in the software stack. (Responsible: Systems Administrator; Verification: Vendor-provided version check and mitigation confirmation tools).
2. Network Segmentation: To limit damage if a gateway is compromised, these appliances should be isolated from sensitive internal zones. This prevents an attacker from using the gateway as a pivot point into the core network. (Responsible: Network Architect; Verification: Firewall rule audit and egress traffic analysis).
3. Strict Access Control Lists (ACLs): To reduce the likelihood of initial compromise, restrict access to the management interface and gateway services to known-good IP ranges where feasible. (Responsible: Security Engineer; Verification: External port scanning from unauthorized IPs).

Controls 1 and 3 are intended to prevent initial access, while control 2 is designed to limit lateral movement and damage.

Remediation priorities

Priority must be given to internet-facing Ivanti gateways due to the lack of authentication requirements for exploitation and the known use by ransomware actors. Defenders should follow the specific mitigation instructions provided by CISA and Ivanti.

Remediation is not a binary state; applying a patch is the first step, but ensuring the appliance has not already been compromised prior to patching is critical given the nature of RCE vulnerabilities.

How to validate remediation

Verification must go beyond a simple version check. To prove exposure was reduced, defenders should:
* Use vendor-authorized integrity checkers or scanners specifically designed for these appliances to ensure no unauthorized modifications exist.
* Confirm that the specific mitigation steps outlined in the CISA and Ivanti advisories have been fully executed.
* Perform authorized connectivity tests to verify that restricted management interfaces are no longer reachable from untrusted zones.

Limits and open questions

A version check alone does not prove a system is secure, as it does not detect post-exploitation persistence or existing backdoors. There remains uncertainty regarding the full scope of ransomware campaigns utilizing this flaw and whether other compensating controls (such as WAF signatures) are effective against all variants of this buffer overflow.

Source and editorial note

CVE-2025-22457: Ivanti Connect Secure, Policy Secure, and ZTA Gateways Stack-Based Buffer Overflow Vulnerability · Source date: April 04, 2025 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

Archive date: April 07, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: October 19, 2026 at 00:13 UTC.

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