What is CVE-2019-11868?

CVE-2019-11868 is a high-severity vulnerability in Softether See.sys, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2019-07-29.

How severe is CVE-2019-11868?

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

Is CVE-2019-11868 known to be exploited?

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

Buffer overflow in Softether See.sys

CVE-2019-11868

See.sys, up to version 4.25, in SoftEther VPN Server versions 4.29 or older, allows a user to call an IOCTL specifying any kernel address to which arbitrary bytes are written to.

Vulnerability class: Buffer Overflow

Published 2019-07-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (26.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Softether See.sys

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

DownWithUp/CVE-Stockpile

References

github.com/SoftEtherVPN/SoftEtherVPN/tree/master/src/See (Third Party Advisory)
downwithup.github.io/CVEPosts (Third Party Advisory)
www.softether.org/9-about/News/900-SEVPN201901 (Vendor Advisory)

Frequently asked questions

What is CVE-2019-11868?: CVE-2019-11868 is a high-severity vulnerability in Softether See.sys, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2019-07-29.
How severe is CVE-2019-11868?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2019-11868 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.