CVE-2021-20255

low-risk
Published 2021-03-09

A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator of QEMU. This issue occurs while processing controller commands due to a DMA reentry issue. This flaw allows a guest user or process to consume CPU cycles or crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Do I need to act?

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0.18% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (2)

Affected Vendors

Debian Qemu

References (10)

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1930646
Mailing List https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html
Third Party Advisory https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Feepro100_stackoverfl...
Third Party Advisory https://security.netapp.com/advisory/ntap-20210507-0003/
Mailing List https://www.openwall.com/lists/oss-security/2021/02/25/1
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1930646
Mailing List https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html
Third Party Advisory https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Feepro100_stackoverfl...
Third Party Advisory https://security.netapp.com/advisory/ntap-20210507-0003/
Mailing List https://www.openwall.com/lists/oss-security/2021/02/25/1
26
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 1/34 · Minimal
Exposure 7/34 · Low