CVE-2026-20715: Intel AMT Denial of Service Vulnerability

CVE-2026-20715 Overview

CVE-2026-20715 is an improper input validation flaw [CWE-20] in firmware for certain Intel Active Management Technology (Intel AMT) and Intel Standard Manageability products. An unauthenticated network adversary can trigger a denial-of-service condition against affected systems. The attack requires no user interaction and has low complexity, though it depends on specific attack requirements being present in the target environment. Successful exploitation impacts availability of the vulnerable firmware component but does not affect confidentiality or integrity. Intel published details in security advisory SA-01427.

Critical Impact
A remote unauthenticated attacker can disrupt Intel AMT and Intel Standard Manageability firmware services on affected platforms, degrading out-of-band management capabilities used by IT operations.

Affected Products

Intel Active Management Technology (Intel AMT) firmware — specific versions listed in Intel Security Advisory SA-01427
Intel Standard Manageability firmware — specific versions listed in the Intel advisory
Business-class platforms shipping with Intel vPro or Intel Standard Manageability enabled

Discovery Timeline

2026-08-11 - CVE-2026-20715 published to the National Vulnerability Database
2026-08-12 - Last updated in NVD database

Technical Details for CVE-2026-20715

Vulnerability Analysis

The vulnerability resides in firmware code paths that process network-delivered input for Intel AMT and Intel Standard Manageability. Improper validation of that input allows an attacker to place the firmware component into a state that halts or crashes its service. Intel AMT provides out-of-band remote management, which typically listens on dedicated ports (16992/16993 for HTTP/HTTPS, 623/664 for redirection, and 5900 for KVM). Loss of availability disables remote provisioning, KVM redirection, boot control, and hardware inventory. The scope is limited to the vulnerable firmware itself; adjacent host operating system availability, integrity, and confidentiality are not reported as impacted.

Root Cause

The root cause is improper input validation [CWE-20] in firmware parsing logic. Input arriving over the network is not sufficiently checked before it reaches processing routines, allowing malformed or unexpected structures to trigger a failure state. Intel has not released public technical details on the exact parser or protocol handler at fault.

Attack Vector

The attack vector is network based. An adversary sends crafted traffic to the management interface exposed by Intel AMT or Intel Standard Manageability. No credentials or user interaction are required. Attack complexity is low, but Intel's CVSS 4.0 vector marks Attack Requirements as Present (AT:P), indicating exploitation depends on conditions such as AMT being provisioned and reachable on the network. The result is a denial-of-service condition against the firmware service.

No public proof-of-concept code is available. See Intel Security Advisory SA-01427 for vendor guidance and affected version ranges.

Detection Methods for CVE-2026-20715

Indicators of Compromise

Unexpected loss of Intel AMT or Intel Standard Manageability responsiveness on TCP ports 16992, 16993, 623, or 664
Repeated failed management console connections to previously reachable endpoints
Firmware watchdog or Management Engine reset events logged by platform telemetry

Detection Strategies

Monitor network flows to AMT management ports for unusual volumes or malformed sessions from unauthorized sources
Alert on management console failures correlated across multiple endpoints in the same subnet, which can indicate scanning or exploitation attempts
Baseline expected administrative source IPs for AMT traffic and flag deviations

Monitoring Recommendations

Ingest firewall and switch flow telemetry into a centralized analytics platform to identify anomalous traffic targeting AMT ports
Track platform Management Engine health and reset counters where available through vendor tooling
Correlate IT service management tickets reporting lost remote management with network events targeting the same hosts

How to Mitigate CVE-2026-20715

Immediate Actions Required

Inventory endpoints where Intel AMT or Intel Standard Manageability is provisioned and enabled
Apply the firmware updates referenced in Intel Security Advisory SA-01427 as soon as OEM releases become available
Restrict network reachability of AMT management ports to trusted administrative VLANs only

Patch Information

Intel has published fixes through OEM firmware updates coordinated in advisory SA-01427. Because Intel AMT firmware is delivered by system manufacturers, obtain the updated BIOS or firmware package from the platform OEM (Dell, HP, Lenovo, and others) that corresponds to the affected model. Verify the installed Management Engine firmware version after the update using vendor tooling such as Intel MEInfo or the Intel CSME Version Detection Tool.

Workarounds

Disable Intel AMT and Intel Standard Manageability in BIOS on systems that do not require out-of-band management
Enforce firewall access control lists that permit AMT ports (16992, 16993, 623, 664, 5900) only from designated management hosts
Segment endpoints with active AMT provisioning into a dedicated management network isolated from general user traffic

bash

# Example: block Intel AMT management ports from untrusted networks on Linux hosts
iptables -A INPUT -p tcp -m multiport --dports 16992,16993,623,664,5900 -j DROP
iptables -A INPUT -p tcp -s 10.10.20.0/24 -m multiport --dports 16992,16993,623,664,5900 -j ACCEPT