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high 7.7

CVE-2020-1711 json

An out-of-bounds heap buffer access flaw was found in the way the iSCSI Block driver in QEMU versions 2.12.0 before 4.2.1 handled a respons…

published 6y ago modified 4mo ago also EUVD-2020-12566

cvss
7.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.0%
EPSS 4.0% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

An out-of-bounds heap buffer access flaw was found in the way the iSCSI Block driver in QEMU versions 2.12.0 before 4.2.1 handled a response coming from an iSCSI server while checking the status of a Logical Address Block (LBA) in an iscsi_co_block_status() routine. A remote user could use this flaw to crash the QEMU process, resulting in a denial of service or potential execution of arbitrary code with privileges of the QEMU process on the host.

Patch / fix

  • qemu qemu 4.2.1
  • qemu Debian 14, Debian 13, Debian 12 1:4.2-2

debian advisories DEBIAN-CVE-2020-1711

  • qemu Ubuntu 16.04 LTS 1:2.5+dfsg-5ubuntu10.43
  • qemu Ubuntu 18.04 LTS 1:2.11+dfsg-1ubuntu7.23
  • qemu Ubuntu 20.04 LTS 1:4.2-3ubuntu1
  • qemu Ubuntu Pro 14.04 LTS 2.0.0+dfsg-2ubuntu1.47+esm6

ubuntu advisories UBUNTU-CVE-2020-1711

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • SLOF RHEL 8 20171214-6.gitfa98132.module+el8.1.0+4066+0f1aadab
  • hivex RHEL 8 1.3.15-7.module+el8.1.0+4066+0f1aadab
  • netcf RHEL 8 0.2.8-12.module+el8.1.0+4066+0f1aadab
  • nbdkit RHEL 8 1.4.2-5.module+el8.1.0+4066+0f1aadab
  • libvirt RHEL 8 4.5.0-35.3.module+el8.1.0+5931+8897e7e1
  • seabios RHEL 8 1.11.1-4.module+el8.1.0+4066+0f1aadab
  • sgabios RHEL 8 1:0.20170427git-3.module+el8.1.0+4066+0f1aadab
  • libiscsi RHEL 8 1.18.0-8.module+el8.1.0+4066+0f1aadab

red hat advisories RHSA-2020:2472RHSA-2020:1358RHSA-2020:1352RHSA-2020:1150RHSA-2020:1296RHSA-2020:1300

  • qemu SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 2.9.1-6.44.1
  • qemu SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 2.6.2-41.59.1
  • qemu SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 2.11.2-9.36.1
  • qemu SLES for SAP 12 SP4, SLES 12 SP4 2.11.2-5.26.1
  • qemu SLES for SAP 12 SP5, SLES 12 SP5 3.1.1.1-3.9.1
  • qemu SLE Module for Server Applications 15 SP1, SLE Module for Basesystem 15 SP1 3.1.1.1-9.14.1
  • qemu SLES for SAP 12 SP1, SLES 12 SP1-LTSS 2.3.1-33.29.1

suse advisories SUSE-SU-2020:1538-1SUSE-SU-2020:1526-1SUSE-SU-2020:1523-1SUSE-SU-2020:1514-1SUSE-SU-2020:1501-1SUSE-SU-2020:0845-1

  • qemu openSUSE Tumbleweed 6.1.0-32.1
  • qemu openSUSE Leap 15.1 3.1.1.1-lp151.7.12.1
  • qemu-linux-user openSUSE Leap 15.1 3.1.1.1-lp151.7.12.1

opensuse advisories openSUSE-SU-2024:11287-1openSUSE-SU-2020:0468-1

  • netcf AlmaLinux 8 0.2.8-12.module_el8.5.0+2608+72063365
  • netcf AlmaLinux 8 0.2.8-12.module_el8.6.0+2880+7d9e3703
  • netcf AlmaLinux 8 0.2.8-12.module_el8.3.0+2048+e7a0a3ea
  • sgabios AlmaLinux 8 1:0.20170427git-3.module_el8.5.0+2608+72063365
  • sgabios AlmaLinux 8 1:0.20170427git-3.module_el8.3.0+2048+e7a0a3ea
  • libiscsi AlmaLinux 8 1.18.0-8.module_el8.6.0+2880+7d9e3703
  • libiscsi AlmaLinux 8 1.18.0-8.module_el8.5.0+2608+72063365
  • libiscsi AlmaLinux 8 1.18.0-8.module_el8.3.0+2048+e7a0a3ea

almalinux advisories ALSA-2020:1358

  • netcf Rocky Linux 8 0.2.8-12.module+el8.7.0+1084+97b81f61
  • netcf Rocky Linux 8 0.2.8-12.module+el8.4.0+534+4680a14e
  • netcf Rocky Linux 8 0.2.8-12.module+el8.6.0+847+b490afdd
  • sgabios Rocky Linux 8 1:0.20170427git-3.module+el8.7.0+1084+97b81f61
  • sgabios Rocky Linux 8 1:0.20170427git-3.module+el8.4.0+534+4680a14e
  • sgabios Rocky Linux 8 1:0.20170427git-3.module+el8.6.0+847+b490afdd
  • libiscsi Rocky Linux 8 1.18.0-8.module+el8.7.0+1084+97b81f61
  • libiscsi Rocky Linux 8 1.18.0-8.module+el8.4.0+534+4680a14e

rocky linux advisories RLSA-2020:1358

Is CVE-2020-1711 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-1711 updated cvss 6.0

QEMU: block: iscsi: OOB heap access via an unexpected response of iSCSI Server

  • Red Hat Enterprise Linux 8 Advanced Virtualization qemu-img, qemu-kvm, qemu-kiwi, qemu-kvm-core, qemu-kvm-tests, qemu-kvm-common, +9 more
    affected: no fix available
  • Red Hat Advanced Virtualization CodeReady Builder for RHEL 8.1.1 hivex 1.3.15-7.module+el8.1.1+5309+6d656f05, libnbd 1.0.3-1.module+el8.1.1+5659+15cacc69, netcf 0.2.8-12.module+el8.1.1+5309+6d656f05, libvirt 5.6.0-10.module+el8.1.1+5309+6d656f05, seabios 1.12.0-5.module+el8.1.1+5309+6d656f05, libiscsi 1.18.0-8.module+el8.1.1+5309+6d656f05, +44 more Red Hat Advanced Virtualization for RHEL 8.1.1 hivex 1.3.15-7.module+el8.1.1+5309+6d656f05, libnbd 1.0.3-1.module+el8.1.1+5659+15cacc69, netcf 0.2.8-12.module+el8.1.1+5309+6d656f05, nbdkit 1.12.5-2.module+el8.1.1+5309+6d656f05, libvirt 5.6.0-10.module+el8.1.1+5309+6d656f05, seabios 1.12.0-5.module+el8.1.1+5309+6d656f05, +97 more
    fixed: vendor fix RHSA-2020:0731
  • Red Hat CodeReady Linux Builder (v. 8) hivex 1.3.15-7.module+el8.1.0+4066+0f1aadab, netcf 0.2.8-12.module+el8.1.0+4066+0f1aadab, seabios 1.11.1-4.module+el8.1.0+4066+0f1aadab, libiscsi 1.18.0-8.module+el8.1.0+4066+0f1aadab, libvirt 4.5.0-35.3.module+el8.1.0+5931+8897e7e1, netcf-libs 0.2.8-12.module+el8.1.0+4066+0f1aadab, +34 more Red Hat Enterprise Linux AppStream (v. 8) hivex 1.3.15-7.module+el8.1.0+4066+0f1aadab, nbdkit 1.4.2-5.module+el8.1.0+4066+0f1aadab, netcf 0.2.8-12.module+el8.1.0+4066+0f1aadab, seabios 1.11.1-4.module+el8.1.0+4066+0f1aadab, libiscsi 1.18.0-8.module+el8.1.0+4066+0f1aadab, supermin 5.1.19-9.module+el8.1.0+4066+0f1aadab, +81 more
    fixed: vendor fix RHSA-2020:1358
  • Red Hat Enterprise Linux AppStream E4S (v. 8.0) hivex 1.3.15-7.module+el8.0.0+4084+cceb9f44, nbdkit 1.4.2-5.module+el8.0.0+4084+cceb9f44, netcf 0.2.8-11.module+el8.0.0+4084+cceb9f44, seabios 1.11.1-4.module+el8.0.0+4084+cceb9f44, libiscsi 1.18.0-7.module+el8.0.0+4084+cceb9f44, libssh2 1.8.0-8.module+el8.0.0+4084+cceb9f44.1, +82 more
    fixed: vendor fix RHSA-2020:2472
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) qemu-img-ma 2.12.0-18.el7_6.5, qemu-kvm-ma 2.12.0-18.el7_6.5, qemu-kvm-tools-ma 2.12.0-18.el7_6.5, qemu-kvm-common-ma 2.12.0-18.el7_6.5
    fixed: vendor fix RHSA-2020:0669
  • Red Hat Enterprise Linux Server (v. 7) qemu-img-ma 2.12.0-44.el7, qemu-kvm-ma 2.12.0-44.el7, qemu-kvm-tools-ma 2.12.0-44.el7, qemu-kvm-common-ma 2.12.0-44.el7
    fixed: vendor fix RHSA-2020:1150
  • Red Hat Enterprise Linux Server EUS (v. 7.5) qemu-img-ma 2.10.0-21.el7_5.5, qemu-kvm-ma 2.10.0-21.el7_5.5, qemu-kvm-tools-ma 2.10.0-21.el7_5.5, qemu-kvm-common-ma 2.10.0-21.el7_5.5
    fixed: vendor fix RHSA-2020:1505
  • Red Hat Enterprise Linux Server EUS (v. 7.6) qemu-img-ma 2.12.0-18.el7_6.5, qemu-kvm-ma 2.12.0-18.el7_6.5, qemu-kvm-tools-ma 2.12.0-18.el7_6.5, qemu-kvm-common-ma 2.12.0-18.el7_6.5
    fixed: vendor fix RHSA-2020:0669
show 11 more
  • Red Hat Enterprise Linux Server EUS (v. 7.7) qemu-img-ma 2.12.0-33.el7_7.3, qemu-kvm-ma 2.12.0-33.el7_7.3, qemu-kvm-tools-ma 2.12.0-33.el7_7.3, qemu-kvm-common-ma 2.12.0-33.el7_7.3
    fixed: vendor fix RHSA-2020:1352
  • Red Hat Enterprise Linux Server Optional (v. 7) qemu-kvm-ma 2.12.0-44.el7, qemu-kvm-tools-ma 2.12.0-44.el7, qemu-kvm-common-ma 2.12.0-44.el7
    fixed: vendor fix RHSA-2020:1150
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.5) qemu-kvm-ma 2.10.0-21.el7_5.5, qemu-kvm-tools-ma 2.10.0-21.el7_5.5, qemu-kvm-common-ma 2.10.0-21.el7_5.5
    fixed: vendor fix RHSA-2020:1505
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.7) qemu-kvm-ma 2.12.0-33.el7_7.3, qemu-kvm-tools-ma 2.12.0-33.el7_7.3, qemu-kvm-common-ma 2.12.0-33.el7_7.3
    fixed: vendor fix RHSA-2020:1352
  • Red Hat OpenStack Platform 10.0 qemu-img-rhev 2.12.0-33.el7_7.10, qemu-kvm-rhev 2.12.0-33.el7_7.10, qemu-kvm-tools-rhev 2.12.0-33.el7_7.10, qemu-kvm-common-rhev 2.12.0-33.el7_7.10
    fixed: vendor fix RHSA-2020:1300
  • Red Hat OpenStack Platform 13.0 qemu-img-rhev 2.12.0-44.el7, qemu-kvm-rhev 2.12.0-44.el7, qemu-kvm-tools-rhev 2.12.0-44.el7, qemu-kvm-common-rhev 2.12.0-44.el7
    fixed: vendor fix RHSA-2020:1296
  • Red Hat OpenStack Platform 13.0 for RHEL 7.6 EUS Server qemu-img-rhev 2.12.0-18.el7_6.9, qemu-kvm-rhev 2.12.0-18.el7_6.9, qemu-kvm-tools-rhev 2.12.0-18.el7_6.9, qemu-kvm-common-rhev 2.12.0-18.el7_6.9
    fixed: vendor fix RHSA-2020:0773
  • Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts qemu-img-rhev 2.12.0-44.el7, qemu-kvm-rhev 2.12.0-44.el7, qemu-kvm-tools-rhev 2.12.0-44.el7, qemu-kvm-common-rhev 2.12.0-44.el7
    fixed: vendor fix RHSA-2020:1216
  • Red Hat RHV-M 4.2 qemu-img-rhev 2.12.0-18.el7_6.9, qemu-kvm-rhev 2.12.0-18.el7_6.9, qemu-kvm-tools-rhev 2.12.0-18.el7_6.9, qemu-kvm-common-rhev 2.12.0-18.el7_6.9
    fixed: vendor fix RHSA-2020:0730
  • Red Hat RHV-M 4.3 qemu-img-rhev 2.12.0-44.el7, qemu-kvm-rhev 2.12.0-44.el7, qemu-kvm-tools-rhev 2.12.0-44.el7, qemu-kvm-common-rhev 2.12.0-44.el7
    fixed: vendor fix RHSA-2020:1216
  • Red Hat Enterprise Linux 5 kvm, xen Red Hat Enterprise Linux 6 qemu-img, qemu-kvm, qemu-kvm-tools, qemu-guest-agent, qemu-guest-agent-win32 Red Hat Enterprise Linux 7 qemu-img, qemu-kvm, libcacard, qemu-kvm-tools, libcacard-tools, qemu-kvm-common, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.02% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.7 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H
NVD 3.1 6.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
NVD 2.0 6.0 AV:N/AC:M/Au:S/C:P/I:P/A:P

Affected products

  • Red Hat QEMU

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.