CVE-2021-43937: Elcomplus SmartPTT SCADA Server web application does not, or cannot, sufficiently verify whether a well-formed

Routine

HIGH 7.6DOWNGRADE

CVE-2021-43937 is a high-severity flaw (CVSS 7.6) 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 web application does not, or cannot, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.

Why this priority

High severity

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

Risk facts

CVSS score	7.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-200, CWE-352
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-2021-43937?

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

Is CVE-2021-43937 being exploited?

CVE-2021-43937 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-2021-43937 affect?

CVE-2021-43937 affects scada server. Severity is high (CVSS 7.6). Elcomplus SmartPTT SCADA Server web application does not, or cannot, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.

How urgent is CVE-2021-43937?

Priority 34/100. High severity

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-2021-43938 HIGH 8.1 DOWNGRADE Elcomplus SmartPTT SCADA Server is vulnerable to an unauthenticated user can request various files from the se

References

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