CVE-2019-9729: In Shanda MapleStory Online V160, the SdoKeyCrypt.sys driver allows privilege escalation to NT AUTHORITY\SYSTE

This month

HIGH 7.8DOWNGRADE

CVE-2019-9729 is a high-severity flaw (CVSS 7.8) affecting maplestory online. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Shanda MapleStory Online V160, the SdoKeyCrypt.sys driver allows privilege escalation to NT AUTHORITY\SYSTEM because of not validating the IOCtl 0x8000c01c input value, leading to an integer signedness error and a heap-based buffer underflow.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-129, CWE-787
Published	2019-03-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: shanda

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

Am I affected?

Timeline

2019-03-12 22:29 UTCPublished CVE record published
2026-06-17 02:44 UTCUpdated Record last modified

shanda maplestory online DOWNGRADE

Affected: 160.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 160.0

1. Check installed version

apt-cache policy maplestory-online || rpm -q maplestory-online || maplestory-online --version

2. No fixed release: DOWNGRADE to a release before 160.0 (Debian / Ubuntu)

apt-cache madison maplestory-online sudo apt install maplestory-online=<VERSION_BEFORE_160.0> sudo apt-mark hold maplestory-online

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

dnf --showduplicates list maplestory-online sudo dnf downgrade maplestory-online-<VERSION_BEFORE_160.0> sudo dnf versionlock add maplestory-online

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-2019-9729?

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

Is CVE-2019-9729 being exploited?

CVE-2019-9729 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-2019-9729 affect?

CVE-2019-9729 affects maplestory online. Severity is high (CVSS 7.8). In Shanda MapleStory Online V160, the SdoKeyCrypt.sys driver allows privilege escalation to NT AUTHORITY\SYSTEM because of not validating the IOCtl 0x8000c01c input value, leading to an integer signedness error and a heap-based buffer under

How urgent is CVE-2019-9729?

Priority 48/100. High severity; Public exploit reference

References

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