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CVE-2021-3567

25
FAUCET Score

CVE-2021-3567 is a high-severity vulnerability in Caribou, a GNOME input mechanism, that allows attackers to bypass screen-locking applications. This flaw, a regression of a previous fix, could lead to a denial of service (system availability) with a CVSS score of 7.5. While no active exploits, public exploit code, or significant community discussion have been observed, the vulnerability poses a notable risk to affected systems.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.4.21CPE matchmatch criteria
cpe:2.3:a:gnome:caribou:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.14%
Probability of exploitation in next 30 days
EPSS Percentile
63.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0114 is in the 41st percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2021-3567Moderate

caribou: segfault on pressing ē since Xorg CVE-2020-25712 fix

Jan 13, 2021

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory