# CVE-2026-77645 — PTC Windchill PDMLink

> As of 2026-08-22, CVE-2026-77645 is a Critical-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in PTC Windchill PDMLink, CVSS v4.0 9.2, EPSS 0.4% (39.1th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-77645 as of 2026-08-22; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-22

## What is CVE-2026-77645?

A critical remote code execution (RCE) vulnerability has been reported in PTC Windchill and PTC FlexPLM. The vulnerability may be exploited through the deserialization of untrusted data.

The record classifies CVE-2026-77645 under weakness classes [CWE-20](https://intel.threadlinqs.com/cwe/CWE-20), [CWE-502](https://intel.threadlinqs.com/cwe/CWE-502). 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 46 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 9.2 — Critical (derived from score) (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/AU:Y/R:U/V:C/RE:M/U:Red`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 39.1% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-20, last modified 2026-08-22

## Is CVE-2026-77645 being exploited?

It currently carries a trending score of 39 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **PTC**: Windchill PDMLink, FlexPLM

## How to fix CVE-2026-77645

No vendor patch reference has been recorded for CVE-2026-77645 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-77645

No threat campaign in the Threadlinqs corpus currently references CVE-2026-77645, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-08-22. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [ptc.com — vendor advisory](https://www.ptc.com/en/support/article/CS474826)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-77645
Full detection coverage and IOCs for threats exploiting CVE-2026-77645 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp