CVE-2017-12840: A kernel driver, namely DLMFENC.sys, bundled with the DESLock+ client application 4.8.16 and earlier contains

Q: How do I fix CVE-2017-12840?

deslock\+: upgrade to newer than 4.8.16. Exact commands for each OS are on this page.

Q: Is CVE-2017-12840 being exploited?

CVE-2017-12840 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-12840 affect?

CVE-2017-12840 affects deslock\+. Severity is high (CVSS 7.8). A kernel driver, namely DLMFENC.sys, bundled with the DESLock+ client application 4.8.16 and earlier contains a locally exploitable heap based buffer overflow in the handling of an IOCTL message of type 0x0FA4204. The vulnerability is prese

Routine

HIGH 7.8UPGRADE

CVE-2017-12840 is a high-severity flaw (CVSS 7.8) affecting deslock\+. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A kernel driver, namely DLMFENC.sys, bundled with the DESLock+ client application 4.8.16 and earlier contains a locally exploitable heap based buffer overflow in the handling of an IOCTL message of type 0x0FA4204. The vulnerability is present due to the kernel driver failing to allocate sufficient memory on the kernel heap to contain a user supplied string as such the string is copied into a buffer of constant size (0x1000-bytes) and thus an over

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-119
Published	2017-08-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: deslock

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

Am I affected?

Timeline

2017-08-28 19:29 UTCPublished CVE record published
2026-06-17 01:04 UTCUpdated Record last modified

deslock deslock\+ UPGRADE

Affected: <= 4.8.16

Fixed in: newer than 4.8.16

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy deslock+ || rpm -q deslock+ || deslock+ --version

2. UPGRADE to newer than 4.8.16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade deslock+

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade deslock+

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2017-12840?

deslock\+: upgrade to newer than 4.8.16. Exact commands for each OS are on this page.

Is CVE-2017-12840 being exploited?

CVE-2017-12840 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-2017-12840 affect?

CVE-2017-12840 affects deslock\+. Severity is high (CVSS 7.8). A kernel driver, namely DLMFENC.sys, bundled with the DESLock+ client application 4.8.16 and earlier contains a locally exploitable heap based buffer overflow in the handling of an IOCTL message of type 0x0FA4204. The vulnerability is prese

How urgent is CVE-2017-12840?

Priority 34/100. High severity

References

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