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NVD / CVE Program· CNA mitre

CVE-2019-20382: QEMU 4.1.0 has a memory leak in zrle_compress_data in ui/vnc-enc-zrle.c during a VNC disconnect operation because libz is misused, resulting

Noroxi assessment

Priority: Monitor (action score 14/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.86% (FIRST EPSS); higher than 58.5% of all records.
  • Someone on the same network segment can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: libiscsi (AlmaLinux:8) 1.18.0-8.module_el8.6.0+2880+7d9e3703, 1.18.0-8.module_el8.3.0+2048+e7a0a3ea, 1.18.0-8.module_el8.5.0+2608+72063365; libiscsi-devel (AlmaLinux:8) 1.18.0-8.module_el8.3.0+2048+e7a0a3ea, 1.18.0-8.module_el8.6.0+2880+7d9e3703, 1.18.0-8.module_el8.5.0+2608+72063365; libiscsi-utils (AlmaLinux:8) 1.18.0-8.module_el8.3.0+2048+e7a0a3ea, 1.18.0-8.module_el8.5.0+2608+72063365, 1.18.0-8.module_el8.6.0+2880+7d9e3703.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to libiscsi (AlmaLinux:8) 1.18.0-8.module_el8.6.0+2880+7d9e3703, 1.18.0-8.module_el8.3.0+2048+e7a0a3ea, 1.18.0-8.module_el8.5.0+2608+72063365; libiscsi-devel (AlmaLinux:8) 1.18.0-8.module_el8.3.0+2048+e7a0a3ea, 1.18.0-8.module_el8.6.0+2880+7d9e3703, 1.18.0-8.module_el8.5.0+2608+72063365; libiscsi-utils (AlmaLinux:8) 1.18.0-8.module_el8.3.0+2048+e7a0a3ea, 1.18.0-8.module_el8.5.0+2608+72063365, 1.18.0-8.module_el8.6.0+2880+7d9e3703 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

QEMU 4.1.0 has a memory leak in zrle_compress_data in ui/vnc-enc-zrle.c during a VNC disconnect operation because libz is misused, resulting in a situation where memory allocated in deflateInit2 is not freed in deflateEnd.

LowCVSS 3.5 · v3.1—No exploit Fix available
Published
Mar 5, 2020
Updated
Jun 16, 2026
EPSS
0.8% · 58th percentile

Report tools

JSON

Action score

14

Monitor

Low priority for now.

CVSS
14 / 40 · 3.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
qemuqemu
opensuseleap
debiandebian linux
canonicalubuntu linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux19.10
  • canonical ubuntu linux20.04
  • debian debian linux10.0
  • debian debian linux9.0
  • opensuse leap15.1
  • qemu qemu4.1.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8libiscsibefore 1.18.0-8.module_el8.6.0+2880+7d9e37031.18.0-8.module_el8.6.0+2880+7d9e3703
AlmaLinux:8libiscsibefore 1.18.0-8.module_el8.3.0+2048+e7a0a3ea1.18.0-8.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libiscsibefore 1.18.0-8.module_el8.5.0+2608+720633651.18.0-8.module_el8.5.0+2608+72063365
AlmaLinux:8libiscsi-develbefore 1.18.0-8.module_el8.3.0+2048+e7a0a3ea1.18.0-8.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libiscsi-develbefore 1.18.0-8.module_el8.6.0+2880+7d9e37031.18.0-8.module_el8.6.0+2880+7d9e3703
AlmaLinux:8libiscsi-develbefore 1.18.0-8.module_el8.5.0+2608+720633651.18.0-8.module_el8.5.0+2608+72063365
AlmaLinux:8libiscsi-utilsbefore 1.18.0-8.module_el8.3.0+2048+e7a0a3ea1.18.0-8.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8libiscsi-utilsbefore 1.18.0-8.module_el8.5.0+2608+720633651.18.0-8.module_el8.5.0+2608+72063365
AlmaLinux:8libiscsi-utilsbefore 1.18.0-8.module_el8.6.0+2880+7d9e37031.18.0-8.module_el8.6.0+2880+7d9e3703
AlmaLinux:8netcfbefore 0.2.8-12.module_el8.3.0+2048+e7a0a3ea0.2.8-12.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8netcfbefore 0.2.8-12.module_el8.6.0+2880+7d9e37030.2.8-12.module_el8.6.0+2880+7d9e3703
AlmaLinux:8netcfbefore 0.2.8-12.module_el8.5.0+2608+720633650.2.8-12.module_el8.5.0+2608+72063365
AlmaLinux:8netcf-develbefore 0.2.8-12.module_el8.6.0+2880+7d9e37030.2.8-12.module_el8.6.0+2880+7d9e3703
AlmaLinux:8netcf-develbefore 0.2.8-12.module_el8.5.0+2608+720633650.2.8-12.module_el8.5.0+2608+72063365
AlmaLinux:8netcf-develbefore 0.2.8-12.module_el8.3.0+2048+e7a0a3ea0.2.8-12.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8netcf-libsbefore 0.2.8-12.module_el8.3.0+2048+e7a0a3ea0.2.8-12.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8netcf-libsbefore 0.2.8-12.module_el8.5.0+2608+720633650.2.8-12.module_el8.5.0+2608+72063365
AlmaLinux:8netcf-libsbefore 0.2.8-12.module_el8.6.0+2880+7d9e37030.2.8-12.module_el8.6.0+2880+7d9e3703
AlmaLinux:8sgabiosbefore 1:0.20170427git-3.module_el8.3.0+2048+e7a0a3ea1:0.20170427git-3.module_el8.3.0+2048+e7a0a3ea
AlmaLinux:8sgabiosbefore 1:0.20170427git-3.module_el8.5.0+2608+720633651:0.20170427git-3.module_el8.5.0+2608+72063365
AlmaLinux:8sgabios-binbefore 1:0.20170427git-3.module_el8.6.0+2880+7d9e37031:0.20170427git-3.module_el8.6.0+2880+7d9e3703
AlmaLinux:8sgabios-binbefore 1:0.20170427git-3.module_el8.5.0+2608+720633651:0.20170427git-3.module_el8.5.0+2608+72063365
Debian:10qemubefore 1:3.1+dfsg-8+deb10u51:3.1+dfsg-8+deb10u5
Debian:12qemubefore 1:4.2-11:4.2-1

+96

Same product

qemu: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-12928The QMP migrate command in QEMU version 4.0.0 and earlier is vulnerable to OS command injection, which allows the remote attacker to achieve
    60This week
  • CVE-2015-8556Local privilege escalation vulnerability in the Gentoo QEMU package before 2.5.0-r1.
    44Plan
  • CVE-2017-15118A stack-based buffer overflow vulnerability was found in NBD server implementation in qemu before 2.11 allowing a client to request an expor
    43Plan

Published before and after this one in the same product

  • ← EarlierCVE-2013-4535Feb 11, 2020 · The virtqueue_map_sg function in hw/virtio/virtio.c in QEMU before 1.7.2 allows remote attackers to execute arbitrary files via a crafted sa
    35Monitor
  • ← EarlierCVE-2020-1711Feb 11, 2020 · 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
    25Monitor
  • Later →CVE-2019-15034Mar 10, 2020 · hw/display/bochs-display.c in QEMU 4.0.0 does not ensure a sufficient PCI config space allocation, leading to a buffer overflow involving th
    23Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:libiscsi1.18.0-8.module_el8.6.0+2880+7d9e3703 · AlmaLinux:8Package registry (OSV)
almalinux:libiscsi-devel1.18.0-8.module_el8.6.0+2880+7d9e3703 · AlmaLinux:8Package registry (OSV)
almalinux:libiscsi-utils1.18.0-8.module_el8.3.0+2048+e7a0a3ea · AlmaLinux:8Package registry (OSV)
almalinux:netcf0.2.8-12.module_el8.5.0+2608+72063365 · AlmaLinux:8Package registry (OSV)
almalinux:netcf-devel0.2.8-12.module_el8.3.0+2048+e7a0a3ea · AlmaLinux:8Package registry (OSV)
almalinux:netcf-libs0.2.8-12.module_el8.6.0+2880+7d9e3703 · AlmaLinux:8Package registry (OSV)
almalinux:sgabios1:0.20170427git-3.module_el8.5.0+2608+72063365 · AlmaLinux:8Package registry (OSV)
almalinux:sgabios-bin1:0.20170427git-3.module_el8.5.0+2608+72063365 · AlmaLinux:8Package registry (OSV)
debian:qemu1:4.2-1 · Debian:12Package registry (OSV)
opensuse:qemu3.1.1.1-lp151.7.12.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:qemu-linux-user3.1.1.1-lp151.7.12.1 · openSUSE:Leap 15.1Package registry (OSV)
red hat:hivex0:1.3.15-7.module+el8.1.0+4066+0f1aadab · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:hivex-debuginfo0:1.3.15-7.module+el8.1.0+4066+0f1aadab · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:hivex-debugsource0:1.3.15-7.module+el8.1.0+4066+0f1aadab · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:hivex-devel0:1.3.15-7.module+el8.1.0+4066+0f1aadab · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs1:1.38.4-15.module+el8.2.0+5297+222a20af · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs-bash-completion1:1.38.4-15.module+el8.2.0+5297+222a20af · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs-benchmarking1:1.38.4-15.module+el8.2.0+5297+222a20af · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs-benchmarking-debuginfo1:1.38.4-15.module+el8.2.0+5297+222a20af · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs-debuginfo1:1.38.4-15.module+el8.2.0+5297+222a20af · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs-debugsource1:1.38.4-15.module+el8.2.0+5297+222a20af · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libguestfs-devel1:1.38.4-15.module+el8.2.0+5297+222a20af · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:SLOF0:20171214-6.gitfa98132.module+el8.1.0+4066+0f1aadab · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:libiscsi0:1.18.0-8.module+el8.7.0+1084+97b81f61 · Rocky Linux:8Package registry (OSV)
rocky linux:netcf0:0.2.8-12.module+el8.7.0+1084+97b81f61 · Rocky Linux:8Package registry (OSV)
rocky linux:sgabios1:0.20170427git-3.module+el8.7.0+1084+97b81f61 · Rocky Linux:8Package registry (OSV)
suse:qemu3.1.1.1-9.14.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
low · the service can be disrupted
Attack vector
Adjacent
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
Low

Weakness class (CWE)

CWE-401 · Missing Release of Memory after Effective Lifetime

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records