Vulnerability Details : 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.
Vulnerability category: Denial of service
Products affected by CVE-2021-20255
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-20255
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 16 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-20255
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:N/I:N/A:P |
3.9
|
2.9
|
NIST | |
|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST |
CWE ids for CVE-2021-20255
-
The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.Assigned by: nvd@nist.gov (Primary)
-
The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.Assigned by: secalert@redhat.com (Secondary)
References for CVE-2021-20255
-
https://bugzilla.redhat.com/show_bug.cgi?id=1930646
1930646 – (CVE-2021-20255) CVE-2021-20255 QEMU: net: eepro100: stack overflow via infinite recursionIssue Tracking;Patch;Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20210507-0003/
CVE-2021-20255 QEMU Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
-
https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html
[SECURITY] [DLA 2623-1] qemu security updateMailing List;Third Party Advisory
-
https://www.openwall.com/lists/oss-security/2021/02/25/1
oss-security - CVE-2021-20255 QEMU: net: eepro100: stack overflow via infiniterecursionMailing List;Patch;Third Party Advisory
-
https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Feepro100_stackoverflow1
eepro100_stackoverflow1 - Files - scieboThird Party Advisory
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