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CVE-2021-3472

24
FAUCET Score

CVE-2021-3472 describes an integer underflow vulnerability in xorg-x11-server versions prior to 1.20.11, impacting Debian, Fedora, Red Hat, and X.Org products. This flaw allows for local privilege escalation, posing a high threat to data confidentiality, integrity, and system availability. With a CVSS score of 7.8 (High), it requires local access and low privileges but has no user interaction. Currently, there is no known active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.20.11CPE matchmatch criteria
cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*
32CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
33CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
34CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.05%
Probability of exploitation in next 30 days
EPSS Percentile
60.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0105 is in the 93rd percentile among its peer group of 17,070 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: xorg-x11-server-0:1.20.4-16.el7_9
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: xorg-x11-server

Vendor Advisories (1)

redhatCVE-2021-3472Important

xorg-x11-server: XChangeFeedbackControl integer underflow leads to privilege escalation

Apr 13, 2021

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
gitlab.freedesktop.org / xorg/xserver/-/commit/7aaf54a1884f71dc363f0b884e57bcb67407a6cd
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2021/04/msg00013.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/MDF7TAJE7NPZPNVOXSD5HBIFLNPUOD2V
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/MO6S5OPXUDYBSRSVWVLFLJ6AFERG4HNY
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/N63KL3T22HNFT4FJ7VMVF6U5Q4RFJIQF
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/PEXPCLMVU25AUZTUXC4MYBGPKOAIM5TW
lists.x.org / archives/xorg-announce/2021-April/003080.html
Mailing ListPatchVendor Advisory
seclists.org / oss-sec/2021/q2/20
Mailing ListPatchThird Party Advisory
security.gentoo.org / glsa/202104-02
Third Party Advisory
debian.org / security/2021/dsa-4893
Third Party Advisory
tenable.com / plugins/nessus/148701
Third Party Advisory
zerodayinitiative.com / advisories/ZDI-21-463
Third Party AdvisoryVDB Entry
openwall.com / lists/oss-security/2021/04/13/1
Mailing ListPatchThird Party Advisory