6.5
MEDIUM
CVE-2021-20257
QEMU e1000 Infinite Loop Denial of Service<span></span>
Description

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.

INFO

Published Date :

March 16, 2022, 3:15 p.m.

Last Modified :

Feb. 12, 2023, 10:15 p.m.

Remotely Exploitable :

No

Impact Score :

4.0

Exploitability Score :

2.0
Affected Products

The following products are affected by CVE-2021-20257 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Redhat enterprise_linux
2 Redhat enterprise_linux_for_power_little_endian
3 Redhat openstack_platform
4 Redhat codeready_linux_builder
5 Redhat enterprise_linux_for_ibm_z_systems
1 Fedoraproject fedora
1 Debian debian_linux
1 Qemu qemu
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-20257.

URL Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1930087 Issue Tracking Patch Third Party Advisory
https://github.com/qemu/qemu/commit/3de46e6fc489c52c9431a8a832ad8170a7569bd8 Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing List Third Party Advisory
https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07428.html Mailing List Patch Vendor Advisory
https://security.gentoo.org/glsa/202208-27 Third Party Advisory
https://security.netapp.com/advisory/ntap-20220425-0003/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/02/25/2 Mailing List Patch Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-20257 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-20257 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Feb. 12, 2023

    Action Type Old Value New Value
    Removed CVSS V3.1 Red Hat, Inc. AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L
    Removed Reference https://access.redhat.com/errata/RHSA-2021:5238 [No Types Assigned]
    Removed Reference https://access.redhat.com/errata/RHSA-2022:0081 [No Types Assigned]
    Removed Reference https://access.redhat.com/security/cve/CVE-2021-20257 [No Types Assigned]
    Added CWE Red Hat, Inc. CWE-835
  • CVE Modified by [email protected]

    Feb. 02, 2023

    Action Type Old Value New Value
    Added CVSS V3.1 Red Hat, Inc. AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L
    Added Reference https://access.redhat.com/security/cve/CVE-2021-20257 [No Types Assigned]
    Added Reference https://access.redhat.com/errata/RHSA-2022:0081 [No Types Assigned]
    Added Reference https://access.redhat.com/errata/RHSA-2021:5238 [No Types Assigned]
    Removed CWE Red Hat, Inc. CWE-835
  • Modified Analysis by [email protected]

    Sep. 23, 2022

    Action Type Old Value New Value
    Changed Reference Type https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html No Types Assigned https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing List, Third Party Advisory
    Changed Reference Type https://security.gentoo.org/glsa/202208-27 No Types Assigned https://security.gentoo.org/glsa/202208-27 Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Sep. 05, 2022

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html [No Types Assigned]
  • CVE Modified by [email protected]

    Aug. 15, 2022

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/202208-27 [No Types Assigned]
  • Modified Analysis by [email protected]

    May. 12, 2022

    Action Type Old Value New Value
    Changed Reference Type https://security.netapp.com/advisory/ntap-20220425-0003/ No Types Assigned https://security.netapp.com/advisory/ntap-20220425-0003/ Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:a:redhat:openstack_platform:10.0:*:*:*:*:*:*:* *cpe:2.3:a:redhat:openstack_platform:13.0:*:*:*:*:*:*:* *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_ibm_z_systems:8.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:a:redhat:codeready_linux_builder:-:*:*:*:*:*:*:* OR cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Apr. 25, 2022

    Action Type Old Value New Value
    Added Reference https://security.netapp.com/advisory/ntap-20220425-0003/ [No Types Assigned]
  • Initial Analysis by [email protected]

    Mar. 22, 2022

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
    Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=1930087 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=1930087 Issue Tracking, Patch, Third Party Advisory
    Changed Reference Type https://github.com/qemu/qemu/commit/3de46e6fc489c52c9431a8a832ad8170a7569bd8 No Types Assigned https://github.com/qemu/qemu/commit/3de46e6fc489c52c9431a8a832ad8170a7569bd8 Patch, Third Party Advisory
    Changed Reference Type https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07428.html No Types Assigned https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg07428.html Mailing List, Patch, Vendor Advisory
    Changed Reference Type https://www.openwall.com/lists/oss-security/2021/02/25/2 No Types Assigned https://www.openwall.com/lists/oss-security/2021/02/25/2 Mailing List, Patch, Third Party Advisory
    Added CWE NIST CWE-835
    Added CPE Configuration OR *cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* versions up to (excluding) 6.2.0
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-20257 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-20257 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.04 }} 0.00%

score

0.12177

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability