CVE-2018-11684 [High] | Out-of-bounds Write in Liblouis

CVE-2018-11684 is rated High Risk (65.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.23%). EPSS rose +1.92% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.31%	2.23%	+1.92%
2	2025-11-21	0.38%	0.31%	-0.07%
3	2025-11-18	—	0.38%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.31%

2.23%

+1.92%

2025-11-21

0.38%

0.31%

-0.07%

2025-11-18

—

0.38%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.8	3.0	HIGH	`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	5.9	[email protected]
6.8	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	8.6	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.8

3.0

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

5.9

[email protected]

6.8

2.0

MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

8.6

6.4

[email protected]

OS Trackers for CVE-2018-11684

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2018-11684 not yet assigned priority: Debian including 1 source packages (liblouis), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2018-11684
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2018-11684
`suse`	medium	CVE-2018-11684 severity moderate: SUSE including 49 source package names (liblouis, liblouis-1.7.0-1.3.13.1, …), 176 product×package rows across 54 product lines (SUSE CaaS Platform 4.5, SUSE Enterprise Storage 7, … (54 product lines)): Fixed 109, Known Not Affected 67.	https://www.suse.com/security/cve/CVE-2018-11684/
`ubuntu`	medium	CVE-2018-11684 medium priority: Ubuntu including 1 source packages (liblouis), 5 status rows across 5 suites (artful, bionic, trusty, upstream, xenial): released 5.	https://ubuntu.com/security/CVE-2018-11684

Affected software / configurations for CVE-2018-11684

Vendor	Product	Version	Raw CPE
liblouis	liblouis	3.5.0	cpe:2.3:a:liblouis:liblouis:3.5.0:::::::*
canonical	ubuntu_linux	14.04	cpe:2.3:o:canonical:ubuntu_linux:14.04::::lts:::
canonical	ubuntu_linux	16.04	cpe:2.3:o:canonical:ubuntu_linux:16.04::::lts:::
canonical	ubuntu_linux	17.10	cpe:2.3:o:canonical:ubuntu_linux:17.10:::::::*
canonical	ubuntu_linux	18.04	cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::
opensuse	leap	15.0	cpe:2.3:o:opensuse:leap:15.0:::::::*

References for CVE-2018-11684

URL	Tags
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00038.html	Third Party Advisory
https://github.com/liblouis/liblouis/issues/592	Issue Tracking Third Party Advisory
https://usn.ubuntu.com/3672-1/	Third Party Advisory

URL

CVE-2018-11684

Exploit prediction scoring system (EPSS) score for CVE-2018-11684

Common vulnerability scoring system (CVSS) metrics for CVE-2018-11684

Weakness enumeration for CVE-2018-11684

OS Trackers for CVE-2018-11684

Affected software / configurations for CVE-2018-11684

References for CVE-2018-11684