CVE-2020-11947

iscsi_aio_ioctl_cb in block/iscsi.c in QEMU 4.1.0 has a heap-based buffer over-read that may disclose unrelated information from process memory to an attacker.

Published: 2020-12-31 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-11947 is rated Low Risk (20.8/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.05%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2020-11947

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 2025-12-04 0.16% 0.05% -0.10%
2 2025-12-02 0.15% 0.16% +0.01%
3 2025-03-17 — 0.15% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-11947

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.8 3.1 LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.0 1.4 [email protected]
2.1 2.0 LOW
AV:L/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.9 2.9 [email protected]

Weakness enumeration for CVE-2020-11947

OS Trackers for CVE-2020-11947

vendor priority summary link
debian not yet assigned CVE-2020-11947 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-2020-11947
redhat low — https://access.redhat.com/security/cve/CVE-2020-11947
suse medium CVE-2020-11947 severity moderate: SUSE including 431 source package names (0.38.1.5.8.40:qemu-4.2.1-11.13.1, 0.38.1.5.8.40:qemu-ipxe-1.0.0+-11.13.1, …), 971 product×package rows across 56 product lines (Container suse/sles/15.2/virt-handler, Container suse/sles/15.2/virt-launcher, … (56 product lines)): Fixed 636, Known Affected 207, Known Not Affected 128. https://www.suse.com/security/cve/CVE-2020-11947/
ubuntu medium CVE-2020-11947 medium priority: Ubuntu including 2 source packages (qemu, qemu-kvm), 32 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 15, not-affected 11, released 3, needs-triage 2, needed 1. https://ubuntu.com/security/CVE-2020-11947

Affected software / configurations for CVE-2020-11947

Vendor Product Version Raw CPE
qemu qemu 4.1.0 cpe:2.3:a:qemu:qemu:4.1.0:-:*:*:*:*:*:*

References for CVE-2020-11947

cvelogic Threat Intelligence