01 Record

CVE-2021-3527

A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined

UnratedPUBLISHEDCNA: redhat

CNA base scoreUnratedNo CNA CVSS vector

View raw JSON

02 Description

A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 0.37% probability of exploitation activity in the next 30 days.
EPSS percentile: Ranks above 30.4% of scored records. A rank, not a probability.
NVD base score: 5.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2021-05-26 21:13Z5 YR AGO

Last updated

2024-08-03 17:01Z2 YR AGO

Reserved

2021-04-30

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-770Allocation of Resources Without Limits or ThrottlingBase

Data version

5.1

Document digest

05c10c5d9d5003da523a639e5d58c8c1e2f4587c7467dd968e071e65a0d88b30

05 Affected products

VendorProductVersionsPlatforms

n/aQEMUall versions—

06 References

bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1955695x_refsource_MISC
www.openwall.comhttps://www.openwall.com/lists/oss-security/2021/05/05/5x_refsource_MISC
gitlab.comhttps://gitlab.com/qemu-project/qemu/-/commit/7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986x_refsource_MISC
gitlab.comhttps://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524cx_refsource_MISC
security.netapp.comhttps://security.netapp.com/advisory/ntap-20210708-0008/x_refsource_CONFIRM
lists.debian.org[debian-lts-announce] 20210902 [SECURITY] [DLA 2753-1] qemu security updatehttps://lists.debian.org/debian-lts-announce/2021/09/msg00000.htmlmailing-listx_refsource_MLIST
security.gentoo.orgGLSA-202208-27https://security.gentoo.org/glsa/202208-27vendor-advisoryx_refsource_GENTOO
lists.debian.org[debian-lts-announce] 20220905 [SECURITY] [DLA 3099-1] qemu security updatehttps://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlmailing-listx_refsource_MLIST

01 Record index

CVE-2021-3527

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-3527

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References