CVE-2021-43938: Elcomplus SmartPTT SCADA Server is vulnerable to an unauthenticated user can request various files from the se

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HIGH 8.1REMOTEDOWNGRADE

CVE-2021-43938 is a high-severity flaw (CVSS 8.1) affecting scada server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Elcomplus SmartPTT SCADA Server is vulnerable to an unauthenticated user can request various files from the server without any authentication or authorization.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-200, CWE-862
Published	2022-04-29
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: smartptt

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-04-29 16:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

smartptt scada server DOWNGRADE

Affected: 1.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4

1. Check installed version

apt-cache policy scada-server || rpm -q scada-server || scada-server --version

2. No fixed release: DOWNGRADE to a release before 1.4 (Debian / Ubuntu)

apt-cache madison scada-server sudo apt install scada-server=<VERSION_BEFORE_1.4> sudo apt-mark hold scada-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list scada-server sudo dnf downgrade scada-server-<VERSION_BEFORE_1.4> sudo dnf versionlock add scada-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-43938?

scada server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-43938 being exploited?

CVE-2021-43938 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-43938 affect?

CVE-2021-43938 affects scada server. Severity is high (CVSS 8.1). Elcomplus SmartPTT SCADA Server is vulnerable to an unauthenticated user can request various files from the server without any authentication or authorization.

How urgent is CVE-2021-43938?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-21155 HIGH 7.5 UPGRADE A specially crafted packet sent to the Fernhill SCADA Server Version 3.77 and earlier may cause an exception,
CVE-2021-43937 HIGH 7.6 DOWNGRADE Elcomplus SmartPTT SCADA Server web application does not, or cannot, sufficiently verify whether a well-formed

References

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