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, 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 . This product uses the NVD API but is not endorsed or certified by the NVD.