What is CVE-2021-20255?

CVE-2021-20255 is a medium-severity vulnerability in Qemu, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2021-03-09.

How severe is CVE-2021-20255?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Qemu

CVE-2021-20255

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.

EPSS: 0.004 (33.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Qemu
Debian Debian_linux — versions 9.0
N/a Qemu — versions all versions

Weakness classification (CWE)

References

secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
secalert@redhat.com (Patch, Mailing List, Third Party Advisory, x_refsource_MISC)
secalert@redhat.com (Third Party Advisory, x_refsource_MISC)
secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory)

Frequently asked questions

What is CVE-2021-20255?: CVE-2021-20255 is a medium-severity vulnerability in Qemu, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2021-03-09.
How severe is CVE-2021-20255?: Medium severity. CVSS v3 base score is 5.5 out of 10.