CVE-2021-3638

lowpriority · track · 26EPSS 0.004 · 37 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.43% (37th) EPSS

CVSS 2.1 · low

Is it mine?

49 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

An out-of-bounds memory access flaw was found in the ATI VGA device emulation of QEMU. This flaw occurs in the ati_2d_blt() routine while handling MMIO write operations when the guest provides invalid values for the destination display parameters. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedSCALANCE XCH328 (6GK5328-4TS01-2EC2)siemens_psirt
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XCM324 (6GK5324-8TS01-2AC2)siemens_psirt
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XCM328 (6GK5328-4TS01-2AC2)siemens_psirt
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XCM332 (6GK5332-0GA01-2AC2)siemens_psirt
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3)siemens_psirt
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3)siemens_psirt
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3)siemens_psirt
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3)siemens_psirt
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3)siemens_psirt
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3)siemens_psirt
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3)siemens_psirt
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XCH328 (6GK5328-4TS01-2EC2)cisa_csaf_ot
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XCM324 (6GK5324-8TS01-2AC2)cisa_csaf_ot
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XCM328 (6GK5328-4TS01-2AC2)cisa_csaf_ot
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XCM332 (6GK5332-0GA01-2AC2)cisa_csaf_ot
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3)cisa_csaf_ot
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3)cisa_csaf_ot
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3)cisa_csaf_ot
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3)cisa_csaf_ot
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3)cisa_csaf_ot
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3)cisa_csaf_ot
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/
FixedSCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3)cisa_csaf_ot
Update to V2.4 or later version
https://support.industry.siemens.com/cs/ww/en/view/109826613/

cvss

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.1–6.5

v2.02.1lowAV:L/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 3.9 · impact 2.9

v3.16.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 2 · impact 4

v3.16.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:Csecondary · CISA US

v3.13.2lowAV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU

v3.16.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:Csecondary · Siemens ProductCERT DE

v3.16mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USCWE-787USCWE-787USCWE-787US

affected products (49)

Products and version ranges known to be affected.

Open Source QEMUall versionscert_bundDEcpe:/a:qemu:qemu:-
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
SCALANCE XCH328 (6GK5328-4TS01-2EC2)all versionscisa_csaf_otUS
SCALANCE XCM324 (6GK5324-8TS01-2AC2)all versionscisa_csaf_otUS
SCALANCE XCM328 (6GK5328-4TS01-2AC2)all versionscisa_csaf_otUS
SCALANCE XCM332 (6GK5332-0GA01-2AC2)all versionscisa_csaf_otUS
SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3)all versionscisa_csaf_otUS
SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3)all versionscisa_csaf_otUS
SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3)all versionscisa_csaf_otUS
SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3)all versionscisa_csaf_otUS
SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3)all versionscisa_csaf_otUS
SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3)all versionscisa_csaf_otUS
SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3)all versionscisa_csaf_otUS
Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2)< V2.4cisa_csaf_otUS
Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2)< V2.4cisa_csaf_otUS
Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2)< V2.4cisa_csaf_otUS
Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2)< V2.4cisa_csaf_otUS
Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3)< V2.4cisa_csaf_otUS

showing 20 of 49

advisories (3)

Vendor and ecosystem advisories describing this.

SSA-806742SSA-806742: Multiple Vulnerabilities in SCALANCE XCM-/XRM-300 before V2.42024-02-13csaf · siemens_psirtDE
SCALANCE XCM-/XRM-300 before V2.4 is affected by multiple vulnerabilities. Siemens has released an update for SCALANCE X-300 and recommends to update to the latest version.
WID-SEC-W-2022-2257QEMU: Schwachstelle ermöglicht Denial of ServiceDeutsch2022-03-03csaf · cert_bundDE
Ein lokaler Angreifer kann eine Schwachstelle in QEMU ausnutzen, um einen Denial of Service Angriff durchzuführen.
ICSA-24-046-11Siemens SCALANCE XCM-/XRM-3002024-02-13icsa · cisa_csaf_otUS
SCALANCE XCM-/XRM-300 before V2.4 is affected by multiple vulnerabilities. Siemens has released an update for SCALANCE X-300 and recommends to update to the latest version.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund cisa_csaf_ot siemens_psirt NVD CVE.org MITRE

published 2022-03-03modified 2026-06-17

references (26)

External citations — patches, advisories, analysis.

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