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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (32.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Qemu
- Debian Linux — versions 9.0
- Qemu — versions all versions
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- www.openwall.com/lists/oss-security/2021/02/25/1 (Patch, Mailing List, Third Party Advisory)
- ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/04/msg00009.html (mailing-list, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20210507-0003/ (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.