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Fencer Vulns
high 7.8

CVE-2021-22754 json

A CWE-787: Out-of-bounds write vulnerability exists inIGSS Definition (Def.exe) V15.0.0.21140 and prior that could result in loss of data o…

published 2021-06-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-9889

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

A CWE-787: Out-of-bounds write vulnerability exists inIGSS Definition (Def.exe) V15.0.0.21140 and prior that could result in loss of data or remote code execution due to lack of proper validation of user-supplied data, when a malicious CGF file is imported to IGSS Definition.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-159-04 updated cvss 7.8

Schneider Electric IGSS

  • Schneider Electric Software, LLC IGSS Definition (Def.exe) <= 15.0.0.21140
    affected: mitigation “If users choose not to apply the remediation provided above, they should immediately apply the following mitigations to reduce the risk of exploitation:” igss.schneider-electric.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.17% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • n/a IGSS Definition (Def.exe) V15.0.0.21140 and prior

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.