CVE-2022-31783 [Medium] | Out-of-bounds Write in Liblouis

CVE-2022-31783 is rated Exploit Available (56.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.33%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-01-12	0.10%	0.33%	+0.23%
2	2025-11-21	0.19%	0.10%	-0.09%
3	2025-11-18	—	0.19%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-01-12

0.10%

0.33%

+0.23%

2025-11-21

0.19%

0.10%

-0.09%

2025-11-18

—

0.19%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	3.6	[email protected]
4.3	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:N/I:N/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:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	8.6	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.5

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

3.6

[email protected]

4.3

2.0

MEDIUM

AV:N/AC:M/Au:N/C:N/I:N/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:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

8.6

2.9

[email protected]

OS Trackers for CVE-2022-31783

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-31783 not yet assigned priority: Debian including 1 source packages (liblouis), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 1.	https://security-tracker.debian.org/tracker/CVE-2022-31783
`gentoo`	low	CVE-2022-31783: 1 GLSA(s) (202301-06), 1 atom(s) (dev-libs/liblouis); latest impact low.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-31783
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2022-31783
`suse`	medium	CVE-2022-31783 severity moderate: SUSE including 32 source package names (liblouis, liblouis-data, …), 182 product×package rows across 51 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (51 product lines)): Fixed 136, Known Not Affected 46.	https://www.suse.com/security/cve/CVE-2022-31783/
`ubuntu`	medium	CVE-2022-31783 medium priority: Ubuntu including 1 source packages (liblouis), 6 status rows across 6 suites (bionic, focal, impish, jammy, upstream, xenial): released 4, needs-triage 1, not-affected 1.	https://ubuntu.com/security/CVE-2022-31783

Affected software / configurations for CVE-2022-31783

Vendor	Product	Version	Raw CPE
liblouis	liblouis	3.21.0	cpe:2.3:a:liblouis:liblouis:3.21.0:::::::*
fedoraproject	fedora	36	cpe:2.3:o:fedoraproject:fedora:36:::::::*

References for CVE-2022-31783

URL	Tags
https://github.com/liblouis/liblouis/commit/ff747ec5e1ac54d54194846f6fe5bfc689192a85	Patch Third Party Advisory
https://github.com/liblouis/liblouis/issues/1214	Exploit Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CFD2KIHESDUCNWTEW3USFB5GKTWT624L/
https://security.gentoo.org/glsa/202301-06	Third Party Advisory

URL

CVE-2022-31783

Public exploit references (Exploit-DB) for CVE-2022-31783

Exploit prediction scoring system (EPSS) score for CVE-2022-31783

Common vulnerability scoring system (CVSS) metrics for CVE-2022-31783

Weakness enumeration for CVE-2022-31783

OS Trackers for CVE-2022-31783

Affected software / configurations for CVE-2022-31783

References for CVE-2022-31783