CVE-2019-12323: The HC.Server service in Hosting Controller HC10 10.14 allows an Invalid Pointer Write DoS.

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2019-12323 is a high-severity flaw (CVSS 7.5) affecting hc10. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The HC.Server service in Hosting Controller HC10 10.14 allows an Invalid Pointer Write DoS.

Why this priority

High severity
EPSS top 5%: very likely to be exploited
Public exploit reference
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	8.8% (top 5%)
CISA exploited list	No
Weakness	CWE-787
Published	2019-06-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hostingcontroller

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

Am I affected?

Timeline

2019-06-24 16:15 UTCPublished CVE record published
2026-06-17 02:14 UTCUpdated Record last modified

hostingcontroller hc10 DOWNGRADE

Affected: 10.14

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.14

1. Check installed version

apt-cache policy hc10 || rpm -q hc10 || hc10 --version

2. No fixed release: DOWNGRADE to a release before 10.14 (Debian / Ubuntu)

apt-cache madison hc10 sudo apt install hc10=<VERSION_BEFORE_10.14> sudo apt-mark hold hc10

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

dnf --showduplicates list hc10 sudo dnf downgrade hc10-<VERSION_BEFORE_10.14> sudo dnf versionlock add hc10

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: HC10 HC.Server Service 10.14 - Remote Invalid Pointer Write

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-2019-12323?

hc10: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-12323 being exploited?

CVE-2019-12323 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-2019-12323 affect?

CVE-2019-12323 affects hc10. Severity is high (CVSS 7.5). The HC.Server service in Hosting Controller HC10 10.14 allows an Invalid Pointer Write DoS.

How urgent is CVE-2019-12323?

Priority 60/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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