---
id: CVE-2026-66360
title: |-
  The ISO Presentation layer contains a flaw in the handling of specific 
  parameters during normal mode negotiation
summary: |-
  The ISO Presentation layer contains a flaw in the handling of specific 
  parameters during normal mode negotiation. A missing length check in the
   processing of the encoded presentation data allows an attacker 
  controlled field with a zer…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
published: '2026-07-30'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:30:43.093'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-66360'
references:
  - url: >-
      https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json
    label: ics-cert@hq.dhs.gov
  - url: 'https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10'
    label: ics-cert@hq.dhs.gov
tags:
  - nvd
epss: 0.00278
epssPercentile: 0.20573
ingestedAt: '2026-09-08T20:10:03.155Z'
---

## Overview

The ISO Presentation layer contains a flaw in the handling of specific 
parameters during normal mode negotiation. A missing length check in the
 processing of the encoded presentation data allows an attacker 
controlled field with a zero length value to trigger a bounded heap over
 read. This condition occurs before MMS session establishment, a crafted
 TCP/102 connection attempt can trigger the issue. The resulting over 
read causes the process to terminate, leading to a denial of service 
condition.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.