CVE-2025-7677: ASPECT Buffer Copy DoS Vulnerability

CVE-2025-7677 Overview

CVE-2025-7677 is a denial-of-service (DoS) vulnerability affecting all versions of ABB ASPECT building automation products. The flaw stems from an improper buffer copy operation [CWE-120] that can cause the software to crash when malformed input reaches the affected component. An unauthorized user with access to the local network can trigger the crash and disrupt availability of the system. The vulnerability does not require authentication or user interaction, though exploitation carries higher attack complexity. ABB has documented the issue in a public security advisory.

Critical Impact
An unauthenticated attacker on the local network can crash the ASPECT software, causing loss of availability for building automation services.

Affected Products

ABB ASPECT — all versions
ABB building automation controllers running ASPECT firmware
Deployments exposing ASPECT services to shared local networks

Discovery Timeline

2025-08-11 - CVE-2025-7677 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-7677

Vulnerability Analysis

The vulnerability is a buffer copy without checking size of input, categorized under [CWE-120]. When the affected ASPECT component receives crafted network input, the copy operation writes beyond the allocated buffer boundary. The resulting memory corruption terminates the process rather than producing controlled code execution, yielding a denial-of-service condition.

Because ASPECT provides building automation and control services, a crash impacts HVAC, lighting, and energy management workflows that depend on the controller. Recovery typically requires a service restart or device reboot, extending downtime beyond the initial crash. The advisory notes that all versions of ASPECT are affected, indicating the flaw resides in longstanding code rather than a recent regression.

Root Cause

The root cause is missing bounds validation in a buffer copy routine within the ASPECT network-facing service. Input data is copied into a fixed-size destination buffer without verifying the source length against the destination capacity. This classic unchecked copy pattern produces stack or heap corruption depending on the buffer's allocation context.

Attack Vector

An attacker with local network access sends a crafted packet to the ASPECT service. No credentials or user interaction are needed, though the CVSS 4.0 vector indicates high attack complexity, suggesting timing or state conditions must align for the crash to occur. The impact is limited to availability, with no confidentiality or integrity effects observed.

Refer to the ABB Security Advisory for vendor technical details.

Detection Methods for CVE-2025-7677

Indicators of Compromise

Unexpected ASPECT service crashes or process restarts recorded in controller logs
Loss of connectivity to building automation endpoints following inbound network traffic bursts
Anomalous packet payloads directed at ASPECT service ports from unmanaged local hosts

Detection Strategies

Monitor ASPECT controllers for abnormal restart cycles and correlate against network capture windows
Deploy network intrusion detection signatures for malformed traffic targeting ASPECT service ports
Baseline normal traffic patterns to ASPECT devices and alert on sudden protocol anomalies

Monitoring Recommendations

Forward controller syslog and crash telemetry to a centralized SIEM for correlation
Track availability metrics for building automation services and alert on unplanned outages
Log all source addresses communicating with ASPECT interfaces to identify unauthorized hosts

How to Mitigate CVE-2025-7677

Immediate Actions Required

Restrict local network access to ASPECT controllers using firewall rules and VLAN segmentation
Place ASPECT devices behind dedicated operational technology (OT) network zones with strict ingress filtering
Review and remove any unnecessary exposure of ASPECT services to general corporate networks
Consult the ABB Security Advisory for vendor-specific guidance

Patch Information

ABB documents the issue in advisory 9AKK108471A4462. Because all ASPECT versions are listed as affected, administrators should contact ABB directly for available firmware updates or compensating configurations. Apply vendor-supplied updates as soon as they become available and validate on non-production systems before rolling out to production controllers.

Workarounds

Enforce network access control lists that permit only authorized management stations to reach ASPECT services
Deploy jump hosts or bastion systems for administrative access rather than direct network connectivity
Implement continuous monitoring of ASPECT device availability to detect exploitation attempts promptly

bash

# Example: restrict ASPECT service access to a management subnet using iptables
iptables -A INPUT -p tcp -s 10.10.50.0/24 -d <aspect_ip> --dport <aspect_port> -j ACCEPT
iptables -A INPUT -p tcp -d <aspect_ip> --dport <aspect_port> -j DROP