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CVE-2016-6833

17
FAUCET Score

CVE-2016-6833 is a use-after-free vulnerability in QEMU's vmxnet3_io_bar0_write function, affecting Debian and QEMU installations. This flaw allows a local guest OS administrator to trigger a denial of service, crashing the QEMU instance. Rated Medium (CVSS 4.4), it requires high privileges and local access to the guest OS, with no impact on confidentiality or integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage, indicating a low current threat level.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.6.2CPE matchmatch criteria
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
2.7.0CPE matchmatch criteria
cpe:2.3:a:qemu:qemu:2.7.0:rc0:*:*:*:*:*:*
2.7.0CPE matchmatch criteria
cpe:2.3:a:qemu:qemu:2.7.0:rc1:*:*:*:*:*:*
2.7.0CPE matchmatch criteria
cpe:2.3:a:qemu:qemu:2.7.0:rc2:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.4MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
0.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.39%
Probability of exploitation in next 30 days
EPSS Percentile
31.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0039 is in the 81st percentile among its peer group of 3,720 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2016-6833Low

Qemu: net: vmxnet3: use-after-free while writing to device

Aug 9, 2016

References

git.qemu.org
lists.debian.org / debian-lts-announce/2018/09/msg00007.html
Mailing ListThird Party Advisory
lists.gnu.org / archive/html/qemu-devel/2016-08/msg01602.html
Mailing ListPatchThird Party Advisory
security.gentoo.org / glsa/201609-01
Third Party Advisory
openwall.com / lists/oss-security/2016/08/12/1
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/08/18/3
Mailing ListThird Party Advisory
securityfocus.com / bid/93255
Third Party AdvisoryVDB Entry