CVE-2019-11536: Kalki Kalkitech SYNC3000 Substation DCU GPC v2.22.6, 2.23.0, 2.24.0, 3.0.0, 3.1.0, 3.1.16, 3.2.3, 3.2.6, 3.5.0

This month

CRITICAL 9.8REMOTEMITIGATE

CVE-2019-11536 is a critical-severity flaw (CVSS 9.8) affecting sync3000 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Kalki Kalkitech SYNC3000 Substation DCU GPC v2.22.6, 2.23.0, 2.24.0, 3.0.0, 3.1.0, 3.1.16, 3.2.3, 3.2.6, 3.5.0, 3.6.0, and 3.6.1, when WebHMI is not installed, allows an attacker to inject client-side commands or scripts to be executed on the device with privileged access, aka CYB/2019/19561. The attack requires network connectivity to the device and exploits the webserver interface, typically through a browser.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 20%)
CISA exploited list	No
Published	2019-05-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: kalkitech

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

Am I affected?

Timeline

2019-05-22 18:29 UTCPublished CVE record published
2026-06-17 02:13 UTCUpdated Record last modified

kalkitech sync3000 firmware MITIGATE

Affected: 2.22.6 · 2.23.0 · 2.24.0 · 3.0.0 · 3.1.0 · 3.1.16 · 3.2.3 · 3.2.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.22.6

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2019-11536?

sync3000 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-11536 being exploited?

CVE-2019-11536 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-2019-11536 affect?

CVE-2019-11536 affects sync3000 firmware. Severity is critical (CVSS 9.8). Kalki Kalkitech SYNC3000 Substation DCU GPC v2.22.6, 2.23.0, 2.24.0, 3.0.0, 3.1.0, 3.1.16, 3.2.3, 3.2.6, 3.5.0, 3.6.0, and 3.6.1, when WebHMI is not installed, allows an attacker to inject client-side commands or scripts to be executed on t

How urgent is CVE-2019-11536?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

References

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