Buffer overflow in Qemu
CVE-2021-3713
An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device emulation of QEMU in versions prior to 6.2.0-rc0. The device uses the guest supplied stream number unchecked, which can lead to out-of-bounds access to the UASDevice->data3 and UASDevice->status3 fields. A malicious guest user could use this flaw to crash QEMU or potentially achieve code execution with the privileges of the QEMU process on the host.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Qemu
- Debian Linux — versions 9.0, 10.0, 11.0
- Qemu — versions qemu 6.2.0-rc0
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- lists.debian.org/debian-lts-announce/2021/09/msg00000.html (mailing-list, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20210923-0006/ (Third Party Advisory)
- www.debian.org/security/2021/dsa-4980 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/202208-27 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2022/09/msg00008.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3713?
- CVE-2021-3713 is a high-severity vulnerability in Qemu, classified under Out-of-bounds Write. CVSS score: 7.4/10. Published 2021-08-25.
- How severe is CVE-2021-3713?
- High severity. CVSS v3 base score is 7.4 out of 10.