synced 15 MIN AGO
01 Record

CVE-2021-3594

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp_input() function and could occur while processing a udp packet that is

UnratedPUBLISHEDCNA: redhat
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 Description

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp_input() function and could occur while processing a udp packet that is

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
0.32% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 25.4% of scored records. A rank, not a probability.
NVD base score
3.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-06-15 00:00Z5 YR AGO
Last updated
2024-08-03 17:01Z2 YR AGO
Reserved
2021-06-10
Assigning CNA
redhat
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-824Access of Uninitialized PointerBase
Data version
5.1
Document digest
db9a4420b8ee39fc02909e777554141dcd4d84db2a9782d735ad8acfc1d54a96

05 Affected products

VendorProductVersionsPlatforms
n/aQEMUlibslirp 4.6.0—

06 References

07 Fixed in

AlmaLinux 8

  • hivex
    Fixed in 1.3.18-21.module_el8.5.0+2608+72063365
  • hivex-devel
    Fixed in 1.3.18-21.module_el8.5.0+2608+72063365
  • libguestfs
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-bash-completion
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-benchmarking
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-devel
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-gfs2
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-gobject
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-gobject-devel
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-inspect-icons
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-java
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-java-devel
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-javadoc
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-man-pages-ja
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-man-pages-uk
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-rescue
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-rsync
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-tools
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-tools-c
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-winsupport
    Fixed in 8.2-1.module_el8.5.0+2608+72063365
  • libguestfs-xfs
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libiscsi
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.18.0-8.module_el8.5.0+2608+72063365
    • Affected before 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libiscsi-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.18.0-8.module_el8.5.0+2608+72063365
    • Affected before 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libiscsi-utils
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.18.0-8.module_el8.5.0+2608+72063365
    • Affected before 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libnbd
    Fixed in 1.2.2-1.module_el8.5.0+2608+72063365
  • libnbd-devel
    Fixed in 1.2.2-1.module_el8.5.0+2608+72063365
  • libvirt
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-admin
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-bash-completion
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-client
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-config-network
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-config-nwfilter
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-interface
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-network
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-nodedev
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-nwfilter
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-qemu
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-secret
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-storage
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365

53 further packages in AlmaLinux 8 not shown (first 40 listed).

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Arch Linux

  • libslirp
    Fixed in 4.6.0-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

  • hivex
    Fixed in 1.3.18-21.module_el8.5.0+2608+72063365
  • hivex-devel
    Fixed in 1.3.18-21.module_el8.5.0+2608+72063365
  • libguestfs
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-bash-completion
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-benchmarking
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-devel
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-gfs2
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-gobject
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-gobject-devel
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-inspect-icons
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-java
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-java-devel
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-javadoc
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-man-pages-ja
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-man-pages-uk
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-rescue
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-rsync
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-tools
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-tools-c
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libguestfs-winsupport
    Fixed in 8.2-1.module_el8.5.0+2608+72063365
  • libguestfs-xfs
    Fixed in 1:1.40.2-28.module_el8.5.0+2608+72063365.alma
  • libiscsi
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.18.0-8.module_el8.5.0+2608+72063365
    • Affected before 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libiscsi-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.18.0-8.module_el8.5.0+2608+72063365
    • Affected before 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libiscsi-utils
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.18.0-8.module_el8.5.0+2608+72063365
    • Affected before 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libnbd
    Fixed in 1.2.2-1.module_el8.5.0+2608+72063365
  • libnbd-devel
    Fixed in 1.2.2-1.module_el8.5.0+2608+72063365
  • libvirt
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-admin
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-bash-completion
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-client
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-config-network
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-config-nwfilter
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-interface
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-network
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-nodedev
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-nwfilter
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-qemu
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-secret
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365
  • libvirt-daemon-driver-storage
    Fixed in 6.0.0-37.module_el8.5.0+2608+72063365

53 further packages in CloudLinux 8 not shown (first 40 listed).

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • libslirp
    Fixed in 4.6.1-1
  • qemu
    Fixed in 1:4.1-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • libslirp
    Fixed in 4.6.1-1
  • qemu
    Fixed in 1:4.1-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • libslirp
    Fixed in 4.6.1-1
  • qemu
    Fixed in 1:4.1-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • qemu
    Fixed in 1:2.11+dfsg-1ubuntu7.37

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • libslirp
    Fixed in 4.1.0-2ubuntu2.2

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • libslirp
    Fixed in 4.6.1-1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • qemu
    Fixed in 2.0.0+dfsg-2ubuntu1.47+esm4
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • qemu
    Fixed in 1:2.5+dfsg-5ubuntu10.51+esm3
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.