CVE-2026-77645: ptc flexplm Improper Input Validation
CVSS: 9.2v4.0CriticalDeferred
Published 20-08-2026Last modified 22-08-2026
Vulnerability summary
CVE-2026-77645 is a critical (CVSS 9.2) Improper Input Validation vulnerability in ptc flexplm. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 45.7% of scored vulnerabilities.
CVSS score
9.2/10
010
Critical · v4.0 (CVE.org)EPSS score
0.56%
0%100%
Low · +0.09 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 20-08-2026PublishedVulnerability first disclosed.
- 22-08-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
2 scores · 2 sources · 1 versionCritical 9.2Preferred score · CVE.org (CNA)
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:RedSourcesAll 2 agree
- NVDNIST9.2CriticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/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:Y/R:U/V:C/RE:M/U:Red
EPSS trend
Probability
0.56%
Chance of exploitation in the next 30 days
Percentile
46%
Versus all other CVEs
30-day change
+0.09 pp
From 0.47% on 21-09-2026
21-09-202621-10-2026
EPSS score0.56%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
- CWE-502Deserialization of Untrusted DataThe product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
Affected systems
Ptc2 products
- flexplm11.0 M030 | 11.1 M020 | 11.2.1.0 | 12.0.0.0 | 12.0.2.0 | 12.0.3.0 | 12.1.2.0 | 12.1.3.0 | 13.0.2.0 | 13.0.3.0
- windchill_pdmlink11.0 M030 | 11.1 M020 | 11.2.1.0 | 12.0.2.0 | 12.1.2.0 | 13.0.2.0 | 13.1.0.0 | 13.1.1.0 | 13.1.2.0 | 13.1.3.0
1 vendor · 2 products