CVE-2021-3593
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6_input() function and could occur while processing a udp packet that is
02 Description
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6_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
- dc24e5fe40d6aeb843d660c57291460bc0903cfaaabfe4f792e873a150dfe5ae
05 Affected products
06 References
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1970487
- lists.fedoraproject.orgFEDORA-2021-71de23beddhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GCKWZWY64EHTOQMLVLTSZ4AA27EWRJMH/
- lists.fedoraproject.orgFEDORA-2021-7cd749f133https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGPQZFVJCFGDSISFXPCQTTBBD7QZLJKI/
- security.gentoo.orgGLSA-202107-44https://security.gentoo.org/glsa/202107-44
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20210805-0004/
- lists.debian.org[debian-lts-announce] 20220404 [SECURITY] [DLA 2970-1] qemu security updatehttps://lists.debian.org/debian-lts-announce/2022/04/msg00002.html
- lists.debian.org[debian-lts-announce] 20230314 [SECURITY] [DLA 3362-1] qemu security updatehttps://lists.debian.org/debian-lts-announce/2023/03/msg00013.html
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.
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.