Vulnerability · Published Jun 15, 2021 · Assigned by redhat
CVE-2021-3595
Low 3.8
In plain English
A low-severity security flaw in QEMU. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)3.8Low
Exploit odds (30 days)0.3%top 74.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the tftp_input() function and could occur while processing a udp packet that is smaller than the size of the 'tftp_t' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | hivex | 1.3.18-21.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | hivex-devel | 1.3.18-21.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-bash-completion | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-benchmarking | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-devel | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-gfs2 | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-gobject | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-gobject-devel | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-inspect-icons | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-java | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-java-devel | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-javadoc | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-man-pages-ja | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-man-pages-uk | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-rescue | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-rsync | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-tools | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-tools-c | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-winsupport | 8.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libguestfs-xfs | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | libiscsi | 1.18.0-8.module_el8.6.0+2880+7d9e3703 | ALSA-2021:4191 |
| AlmaLinux:8 | libiscsi | 1.18.0-8.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libiscsi-devel | 1.18.0-8.module_el8.6.0+2880+7d9e3703 | ALSA-2021:4191 |
| AlmaLinux:8 | libiscsi-devel | 1.18.0-8.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libiscsi-utils | 1.18.0-8.module_el8.6.0+2880+7d9e3703 | ALSA-2021:4191 |
| AlmaLinux:8 | libiscsi-utils | 1.18.0-8.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libnbd | 1.2.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libnbd-devel | 1.2.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-admin | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-bash-completion | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-client | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-config-network | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-config-nwfilter | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-interface | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-network | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-nodedev | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-nwfilter | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-qemu | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-secret | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-storage | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-storage-core | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-storage-disk | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-storage-gluster | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-storage-iscsi | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-storage-iscsi-direct | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-storage-logical | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-storage-mpath | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-storage-rbd | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-driver-storage-scsi | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-daemon-kvm | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-dbus | 1.3.0-2.module_el8.6.0+2880+7d9e3703 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-dbus | 1.3.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-devel | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-docs | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-libs | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-lock-sanlock | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | libvirt-nss | 6.0.0-37.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | lua-guestfs | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | nbdfuse | 1.2.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-bash-completion | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-basic-filters | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-basic-plugins | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-curl-plugin | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-devel | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-example-plugins | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-gzip-plugin | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-linuxdisk-plugin | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-python-plugin | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-server | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-ssh-plugin | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-vddk-plugin | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | nbdkit-xz-filter | 1.16.2-4.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | netcf | 0.2.8-12.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | netcf | 0.2.8-12.module_el8.6.0+2880+7d9e3703 | ALSA-2021:4191 |
| AlmaLinux:8 | netcf-devel | 0.2.8-12.module_el8.6.0+2880+7d9e3703 | ALSA-2021:4191 |
| AlmaLinux:8 | netcf-devel | 0.2.8-12.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | netcf-libs | 0.2.8-12.module_el8.6.0+2880+7d9e3703 | ALSA-2021:4191 |
| AlmaLinux:8 | netcf-libs | 0.2.8-12.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | perl-Sys-Guestfs | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | perl-Sys-Virt | 6.0.0-1.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | perl-hivex | 1.3.18-21.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | python3-hivex | 1.3.18-21.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | python3-libguestfs | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | python3-libnbd | 1.2.2-1.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | python3-libvirt | 6.0.0-1.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | ruby-hivex | 1.3.18-21.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | ruby-libguestfs | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | seabios | 1.13.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | seabios-bin | 1.13.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | seavgabios-bin | 1.13.0-2.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | sgabios | 1:0.20170427git-3.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | sgabios | 1:0.20170427git-3.module_el8.6.0+2880+7d9e3703 | ALSA-2021:4191 |
| AlmaLinux:8 | sgabios-bin | 1:0.20170427git-3.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | sgabios-bin | 1:0.20170427git-3.module_el8.6.0+2880+7d9e3703 | ALSA-2021:4191 |
| AlmaLinux:8 | supermin | 5.1.19-10.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | supermin-devel | 5.1.19-10.module_el8.5.0+2608+72063365 | ALSA-2021:4191 |
| AlmaLinux:8 | virt-dib | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| AlmaLinux:8 | virt-v2v | 1:1.40.2-28.module_el8.5.0+2608+72063365.alma | ALSA-2021:4191 |
| Alpine:v3.20 | libslirp | 4.6.0-r0 | ALPINE-CVE-2021-3595 |
| Alpine:v3.21 | libslirp | 4.6.0-r0 | ALPINE-CVE-2021-3595 |
| Alpine:v3.22 | libslirp | 4.6.0-r0 | ALPINE-CVE-2021-3595 |
| Alpine:v3.23 | libslirp | 4.6.0-r0 | ALPINE-CVE-2021-3595 |
| Alpine:v3.24 | libslirp | 4.6.0-r0 | ALPINE-CVE-2021-3595 |
| Debian:12 | libslirp | 4.6.1-1 | DEBIAN-CVE-2021-3595 |
| Debian:13 | libslirp | 4.6.1-1 | DEBIAN-CVE-2021-3595 |
| Debian:14 | libslirp | 4.6.1-1 | DEBIAN-CVE-2021-3595 |
| Debian:12 | qemu | 1:4.1-2 | DEBIAN-CVE-2021-3595 |
| Debian:13 | qemu | 1:4.1-2 | DEBIAN-CVE-2021-3595 |
| Debian:14 | qemu | 1:4.1-2 | DEBIAN-CVE-2021-3595 |
| Rocky Linux:8 | hivex | 0:1.3.18-21.module+el8.5.0+670+c4aa478c | RLSA-2021:4191 |
| Rocky Linux:8 | hivex | 0:1.3.18-21.module+el8.4.0+642+7e26f5e1 | RLSA-2021:4191 |
| Rocky Linux:8 | libguestfs | 1:1.40.2-28.module+el8.5.0+670+c4aa478c | RLSA-2021:4191 |
| Rocky Linux:8 | libguestfs-winsupport | 0:8.2-1.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux:8 | libiscsi | 0:1.18.0-8.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux:8 | libiscsi | 0:1.18.0-8.module+el8.6.0+847+b490afdd | RLSA-2021:4191 |
| Rocky Linux:8 | libiscsi | 0:1.18.0-8.module+el8.7.0+1084+97b81f61 | RLSA-2021:4191 |
| Rocky Linux:8 | libnbd | 0:1.2.2-1.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux:8 | libvirt | 0:6.0.0-37.module+el8.5.0+670+c4aa478c | RLSA-2021:4191 |
| Rocky Linux:8 | libvirt-dbus | 0:1.3.0-2.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux:8 | libvirt-dbus | 0:1.3.0-2.module+el8.6.0+847+b490afdd | RLSA-2021:4191 |
| Rocky Linux:8 | libvirt-dbus | 0:1.3.0-2.module+el8.7.0+1084+97b81f61 | RLSA-2021:4191 |
| Rocky Linux:8 | libvirt-python | 0:6.0.0-1.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux:8 | nbdkit | 0:1.16.2-4.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux:8 | netcf | 0:0.2.8-12.module+el8.7.0+1084+97b81f61 | RLSA-2021:4191 |
| Rocky Linux:8 | netcf | 0:0.2.8-12.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux:8 | netcf | 0:0.2.8-12.module+el8.6.0+847+b490afdd | RLSA-2021:4191 |
| Rocky Linux:8 | perl-Sys-Virt | 0:6.0.0-1.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux:8 | qemu-kvm | 5:4.2.0-59.module+el8.5.0+670+c4aa478c | RLSA-2021:4191 |
| Rocky Linux:8 | seabios | 0:1.13.0-2.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux:8 | sgabios | 1:0.20170427git-3.module+el8.6.0+847+b490afdd | RLSA-2021:4191 |
| Rocky Linux:8 | sgabios | 1:0.20170427git-3.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Rocky Linux:8 | sgabios | 1:0.20170427git-3.module+el8.7.0+1084+97b81f61 | RLSA-2021:4191 |
| Rocky Linux:8 | supermin | 0:5.1.19-10.module+el8.4.0+534+4680a14e | RLSA-2021:4191 |
| Ubuntu:22.04:LTS | libslirp | 4.6.1-1 | UBUNTU-CVE-2021-3595 |
Affected products (as reported)
Weakness: CWE-824
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1970489
- FEDORA-2021-71de23bedd vendor-advisory
- FEDORA-2021-7cd749f133 vendor-advisory
- GLSA-202107-44 vendor-advisory
- https://security.netapp.com/advisory/ntap-20210805-0004/
- [debian-lts-announce] 20210902 [SECURITY] [DLA 2753-1] qemu security update mailing-list
- [debian-lts-announce] 20230314 [SECURITY] [DLA 3362-1] qemu security update mailing-list