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CVE-2021-43555

44
FAUCET Score

CVE-2021-43555 is a high-severity path traversal vulnerability affecting mySCADA myDESIGNER versions 8.20.0 and prior. The flaw stems from insufficient validation of imported project files, allowing an unauthenticated attacker to plant or overwrite arbitrary files on the system. This can lead to remote code execution, with a CVSS score of 7.8. While the vulnerability has a high impact, there is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 8.20.0CPE matchmatch criteria
cpe:2.3:a:myscada:mydesigner:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.3HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
37.99%
Probability of exploitation in next 30 days
EPSS Percentile
98.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.3799 is in the 99th percentile among its peer group of 11,616 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

us-cert.cisa.gov / ics/advisories/icsa-21-313-04
PatchThird Party AdvisoryUS Government Resource