CVE-2020-1711

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.

Published: 2020-02-11 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-1711 is rated High Risk (65.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 4.02%). EPSS rose +3.69% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-1711

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.33% 4.02% +3.69%
2 2026-06-12 0.39% 0.33% -0.05%
3 2026-06-11 — 0.39% —

Full EPSS history (26 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-1711

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.7 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.3 [email protected]
6.0 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 1.8 3.7 [email protected]
6.0 2.0 MEDIUM
AV:N/AC:M/Au:S/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 6.8 6.4 [email protected]

Weakness enumeration for CVE-2020-1711

OS Trackers for CVE-2020-1711

vendor priority summary link
alpine medium CVE-2020-1711: 1 source package rows (qemu); 3 state rows across 3 repos (3.10-main, 3.22-community, edge-community); fixed 0, open 3. https://security.alpinelinux.org/vuln/CVE-2020-1711
debian not yet assigned CVE-2020-1711 not yet assigned priority: Debian including 1 source packages (qemu), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-1711
gentoo normal CVE-2020-1711: 1 GLSA(s) (202005-02), 1 atom(s) (app-emulation/qemu); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-1711
redhat high — https://access.redhat.com/security/cve/CVE-2020-1711
suse high — https://www.suse.com/security/cve/CVE-2020-1711/
ubuntu medium CVE-2020-1711 medium priority: Ubuntu including 2 source packages (qemu, qemu-kvm), 34 status rows across 17 suites (bionic, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 16, released 15, needs-triage 2, needed 1. https://ubuntu.com/security/CVE-2020-1711

Affected software / configurations for CVE-2020-1711

Vendor Product Version Raw CPE
qemu qemu >= 2.12.0, < 4.2.1 cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*
redhat openstack 10 cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:*
redhat openstack 13 cpe:2.3:a:redhat:openstack:13:*:*:*:*:*:*:*
redhat enterprise_linux 7.0 cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
opensuse leap 15.1 cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*

References for CVE-2020-1711

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00007.html Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0669 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0730 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0731 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0773 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1711 Issue Tracking Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/03/msg00017.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00013.html Mailing List Third Party Advisory
https://lists.gnu.org/archive/html/qemu-devel/2020-01/msg05535.html Mailing List Patch Third Party Advisory
https://security.gentoo.org/glsa/202005-02 Third Party Advisory
https://usn.ubuntu.com/4283-1/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/01/23/3 Mailing List Third Party Advisory
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