CVE-2021-22756

Code execution via out-of-bounds CGF parsing

Published Jun 11, 2021 · Updated Aug 3, 2024

Out-of-bounds read in IGSS Definition 15.0.0.21140 and earlier allows attackers to disclose data or execute code via a malicious CGF file. Def.exe fails to validate user-supplied CGF data before parsing it, causing a read beyond the intended buffer during import. Exploitation requires a user to import the crafted file, after which process data can be exposed or attacker-controlled code can run.

CVSS severity7.8
High
EPSS probability1.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in IGSS Definition 15.0.0.21140 and earlier allows attackers to disclose data or execute code via a malicious CGF file. Def.exe fails to validate user-supplied CGF data before parsing it, causing a read beyond the intended buffer during import. Exploitation requires a user to import the crafted file, after which process data can be exposed or attacker-controlled code can run.

The record

CVE
CVE-2021-22756
Published
Jun 11, 2021
Updated
Aug 3, 2024
Vendor
Distributed Data Systems
Product
IGSS (Interactive Graphical SCADA System)
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=IGSS Definition (Def.exe) V15.0.0.21140 and prior

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Distributed Data Systems · IGSS (Interactive Graphical SCADA System)version=IGSS Definition (Def.exe) V15.0.0.21140 and prior

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo