CVE-2021-20257

CVSS V2 Low 2.1 CVSS V3 Medium 6.5
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.
Overview
  • CVE ID
  • CVE-2021-20257
  • Assigner
  • secalert@redhat.com
  • Vulnerability Status
  • Modified
  • Published Version
  • 2022-03-16T15:15:09
  • Last Modified Date
  • 2023-02-12T22:15:17
Weakness Enumerations
CWE URL
CWE-835 http://cwe.mitre.org/data/definitions/835.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
AND
cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* 1 OR 6.2.0
AND
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* 1 OR
AND
cpe:2.3:a:redhat:openstack_platform:10.0:*:*:*:*:*:*:* 1 OR
cpe:2.3:a:redhat:openstack_platform:13.0:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:advanced_virtualization:*:*:* 1 OR
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:* 1 OR
AND
cpe:2.3:a:redhat:codeready_linux_builder:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* 0 OR
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:* 0 OR
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* 1 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:L/AC:L/Au:N/C:N/I:N/A:P
  • Access Vector
  • LOCAL
  • Access Compatibility
  • LOW
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • NONE
  • Availability Impact
  • PARTIAL
  • Base Score
  • 2.1
  • Severity
  • LOW
  • Exploitability Score
  • 3.9
  • Impact Score
  • 2.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
  • Attack Vector
  • LOCAL
  • Attack Compatibility
  • LOW
  • Privileges Required
  • LOW
  • User Interaction
  • NONE
  • Scope
  • CHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • HIGH
  • Base Score
  • 6.5
  • Base Severity
  • MEDIUM
  • Exploitability Score
  • 2
  • Impact Score
  • 4
References
Reference URL Reference Tags
https://access.redhat.com/errata/RHSA-2021:5238
https://access.redhat.com/errata/RHSA-2022:0081
https://access.redhat.com/security/cve/CVE-2021-20257
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
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2021-20257
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20257
History
Created Old Value New Value Data Type Notes
2022-05-10 06:26:37 Added to TrackCVE
2022-12-06 12:29:14 2022-03-16T15:15Z 2022-03-16T15:15:09 CVE Published Date updated
2022-12-06 12:29:14 2022-09-23T15:20:01 CVE Modified Date updated
2022-12-06 12:29:14 Analyzed Vulnerability Status updated
2022-12-06 12:29:19 References updated
2023-02-02 22:13:26 2023-02-02T21:20:54 CVE Modified Date updated
2023-02-02 22:13:26 Analyzed Modified Vulnerability Status updated
2023-02-02 22:13:27 References updated
2023-02-12 22:17:26 2023-02-12T22:15:17 CVE Modified Date updated