EUVD-2026-82378Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
AC:H because exploitation needs both an MITM position and a trusted-CA cert for a wrong hostname; PR:N/UI:N as no auth or victim action is required; C:H/I:H from telemetry read and authentic message injection, A:L as availability impact is unclear.
Primary rating from Vendor (AMZN).
CVSS VectorVendor: AMZN
Lifecycle Timeline
8DescriptionCVE.org
Improper validation of certificate with host mismatch in the MQTT client TLS connection layer in AWS IoT Device SDK for Python 1.5.3 through 1.6.0 on Python 3.7 and later might allow an adversary-in-the-middle actor to impersonate the AWS IoT Core endpoint, read device telemetry, and inject arbitrary MQTT messages that the device processes as authentic, via a certificate issued for an unrelated hostname by a certificate authority present in the device trust store.
To remediate this issue, users should upgrade to version 1.6.1.
Articles & Coverage 1
AnalysisAI
Improper TLS hostname validation in the MQTT client layer of AWS IoT Device SDK for Python (AWSIoTPythonSDK) 1.5.3 through 1.6.0 running on Python 3.7 and later allows an adversary-in-the-middle who possesses a certificate issued for an unrelated hostname by a certificate authority already in the device trust store to impersonate the AWS IoT Core endpoint, read device telemetry, and inject MQTT messages that the device processes as authentic. This is not exploitable from an arbitrary internet location: the attacker must hold an on-path position and a trusted-CA certificate for an unrelated hostname. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an active adversary-in-the-middle position on the network path between the device and the AWS IoT Core endpoint, AND a TLS certificate issued for an unrelated hostname by a certificate authority that is already present in the device's trust store. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor's CVSS 4.0 base score of 9.2 (Critical) reflects full compromise of confidentiality and integrity (VC:H/VI:H/VA:H) over a network vector with no privileges or user interaction (AV:N/PR:N/UI:N), but the AT:P flag (attack requirements present) is doing important work: exploitation requires both an adversary-in-the-middle (AiTM) network position AND a certificate issued for an unrelated hostname by a certificate authority already present in the device trust store. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: AWSIoTPythonSDK 1.6.1 and GitHub release v1.6.1, which adds TLS hostname verification according to the release notes for PR #354. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all devices and applications using AWSIoTPythonSDK versions 1.5.3 through 1.6.0 and apply the vendor-released patch 1.6.1 where feasible; if immediate patching is not possible, isolate affected devices on segmented networks and monitor for anomalous MQTT traffic. …
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