CVE-2018-12635: CirCarLife Scada v4.2.4 allows unauthorized upgrades via requests to the html/upgrade.html and services/system

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2018-12635 is a high-severity flaw (CVSS 7.5) affecting scada. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CirCarLife Scada v4.2.4 allows unauthorized upgrades via requests to the html/upgrade.html and services/system/firmware.upgrade URIs.

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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-06-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: circontrol

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

Am I affected?

Timeline

2018-06-22 00:29 UTCPublished CVE record published
2026-06-17 01:38 UTCUpdated Record last modified

circontrol scada DOWNGRADE

Affected: 4.2.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.2.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.2.4 (Debian / Ubuntu)

apt-cache madison scada sudo apt install scada=<VERSION_BEFORE_4.2.4> sudo apt-mark hold scada

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

dnf --showduplicates list scada sudo dnf downgrade scada-<VERSION_BEFORE_4.2.4> sudo dnf versionlock add scada

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-2018-12635?

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

Is CVE-2018-12635 being exploited?

CVE-2018-12635 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-2018-12635 affect?

CVE-2018-12635 affects scada. Severity is high (CVSS 7.5). CirCarLife Scada v4.2.4 allows unauthorized upgrades via requests to the html/upgrade.html and services/system/firmware.upgrade URIs.

How urgent is CVE-2018-12635?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

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References

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