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Fencer Vulns
medium 5.4

CVE-2021-33120 json

Out of bounds read under complex microarchitectural condition in memory subsystem for some Intel Atom(R) Processors may allow authenticated…

published 2022-02-09 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19835

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

Out of bounds read under complex microarchitectural condition in memory subsystem for some Intel Atom(R) Processors may allow authenticated user to potentially enable information disclosure or cause denial of service via network access.

Patch / fix

  • intel-microcode Debian 14, Debian 13, Debian 12 3.20220207.1

debian advisories DEBIAN-CVE-2021-33120

  • intel-microcode Ubuntu 18.04 LTS 3.20220510.0ubuntu0.18.04.1
  • intel-microcode Ubuntu 20.04 LTS 3.20220510.0ubuntu0.20.04.1
  • intel-microcode Ubuntu 22.04 LTS 3.20220510.0ubuntu0.22.04.1
  • intel-microcode Ubuntu Pro 16.04 LTS 3.20220510.0ubuntu0.16.04.1+esm1

ubuntu advisories UBUNTU-CVE-2021-33120

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ucode-intel SLES for SAP 12 SP5, SLES 12 SP5 20220207-3.38.1
  • ucode-intel SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4-LTSS +8 more 20220207-13.93.1
  • ucode-intel SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +10 more 20220207-10.1
  • ucode-intel SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 20220207-3.206.1
  • ucode-intel SLES for SAP 15, SLE High Performance Computing 15-LTSS, SLE High Performance Computing 15-ESPOS 20220207-3.70.1

suse advisories SUSE-SU-2022:0576-1SUSE-SU-2022:0575-1SUSE-SU-2022:0574-1SUSE-SU-2022:0541-1SUSE-SU-2022:0502-1

  • ucode-intel openSUSE Tumbleweed 20220207-1.1
  • ucode-intel openSUSE Leap 15.3 20220207-10.1

opensuse advisories openSUSE-SU-2024:11840-1openSUSE-SU-2022:0574-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-33120 updated cvss 3.6

microcode: Out of bounds read for some Intel Atom processors

  • Red Hat Enterprise Linux 6 microcode_ctl Red Hat Enterprise Linux 7 microcode_ctl Red Hat Enterprise Linux 8 microcode_ctl
    affected: no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.95% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
NVD 2.0 5.5 AV:N/AC:L/Au:S/C:P/I:N/A:P

Affected products

  • n/a Intel Atom(R) Processors

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.