Vulnerability Details : CVE-2021-20257
An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles 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-2021-20257
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:openstack_platform:10.0:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:openstack_platform:13.0:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:codeready_linux_builder:-:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
Threat overview for CVE-2021-20257
Top countries where our scanners detected CVE-2021-20257
Top open port discovered on systems with this issue
53
IPs affected by CVE-2021-20257 175,849
Threat actors abusing to this issue?
Yes
Find out if you* are
affected by CVE-2021-20257!
*Directly or indirectly through your vendors, service providers and 3rd parties.
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attack surface intelligence
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Exploit prediction scoring system (EPSS) score for CVE-2021-20257
0.03%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 4 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-20257
| 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 | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |
2.0
|
4.0
|
NIST |
CWE ids for CVE-2021-20257
-
The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.Assigned by:
- nvd@nist.gov (Secondary)
- secalert@redhat.com (Primary)
References for CVE-2021-20257
-
https://github.com/qemu/qemu/commit/3de46e6fc489c52c9431a8a832ad8170a7569bd8
e1000: fail early for evil descriptor · qemu/qemu@3de46e6 · GitHubPatch;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
[SECURITY] [DLA 3099-1] qemu security updateMailing List;Third Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=1930087
1930087 – (CVE-2021-20257) CVE-2021-20257 QEMU: net: e1000: infinite loop while processing transmit descriptorsIssue Tracking;Patch;Third Party Advisory
-
https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07428.html
[PATCH] e1000: fail early for evil descriptorMailing List;Patch;Vendor Advisory
-
https://www.openwall.com/lists/oss-security/2021/02/25/2
oss-security - CVE-2021-20257 QEMU: net: e1000: infinite loop while processing transmit descriptorsMailing List;Patch;Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20220425-0003/
March 2022 QEMU Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
-
https://security.gentoo.org/glsa/202208-27
QEMU: Multiple Vulnerabilities (GLSA 202208-27) — Gentoo securityThird Party Advisory
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