What is CVE-2019-9729?

CVE-2019-9729 is a high-severity vulnerability in Shanda Maplestory Online, classified under Improper Validation of Array Index. CVSS score: 7.8/10. Published 2019-03-12.

How severe is CVE-2019-9729?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2019-9729 known to be exploited?

10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Shanda Maplestory Online

CVE-2019-9729

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.

Published 2019-03-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (62.9th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Shanda Maplestory Online — versions 160.0

Weakness classification (CWE)

Public proof-of-concept exploits

References

github.com/DoubleLabyrinth/SdoKeyCrypt-sys-local-privilege-elevation (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-9729?: CVE-2019-9729 is a high-severity vulnerability in Shanda Maplestory Online, classified under Improper Validation of Array Index. CVSS score: 7.8/10. Published 2019-03-12.
How severe is CVE-2019-9729?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2019-9729 known to be exploited?: 10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.