CVE-2021-3713: debian debian_linux Out-of-bounds Write
Vulnerability summary
CVE-2021-3713 is a high (CVSS 7.4) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 47.1% of scored vulnerabilities.
Not severe (CVSS 7.4, physical access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 16 · Related 13Timeline
- 25-08-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.4HighCVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.4HighCVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- OSV · AlpineEcosystem advisory · calculated7.4HighCVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
0.57%
Chance of exploitation in the next 30 days
Percentile
47%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.57% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: physical access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- qemu< 1:6.1+dfsg-2
- debian_linuxEOL9.0 | 10.0 | 11.0
Alpine1 product
- qemu< 6.1.1-r0
Qemu1 product
- qemu≤ 6.1.0
Ubuntu1 product
- qemu< 1:6.2+dfsg-2ubuntu5
4 vendors · 5 products
References
14 links
lists.debian.org/debian-lts-announce/2021/09/msg00000.htmlMailing ListX Refsource MLISTThird Party Advisory- lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing ListX Refsource MLISTThird Party Advisory
