CVE-2019-20485 [Medium] | Input Validation Bypass in Libvirt

CVE-2019-20485 is rated Moderate Risk (41.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.81%). Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.19%	0.81%	+0.62%
2	2025-12-06	0.26%	0.19%	-0.07%
3	2025-12-02	—	0.26%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.19%

0.81%

+0.62%

2025-12-06

0.26%

0.19%

-0.07%

2025-12-02

—

0.26%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.7	3.1	MEDIUM	`CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. 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:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.1	3.6	[email protected]
2.7	2.0	LOW	`AV:A/AC:L/Au:S/C:N/I:N/A:P` Click to expand Access vector (AV:A) Requires access to an adjacent network segment. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:S) A single authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	5.1	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.7

3.1

MEDIUM

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
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:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.1

3.6

[email protected]

2.7

2.0

LOW

AV:A/AC:L/Au:S/C:N/I:N/A:P Click to expand

Access vector (AV:A): Requires access to an adjacent network segment.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:S): A single authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

5.1

2.9

[email protected]

OS Trackers for CVE-2019-20485

vendor	priority	summary	link
`alpine`	medium	CVE-2019-20485: 1 source package rows (libvirt); 4 state rows across 4 repos (3.10-main, 3.11-main, 3.22-community, edge-community); fixed 2, open 2.	https://security.alpinelinux.org/vuln/CVE-2019-20485
`debian`	low	CVE-2019-20485 low priority: Debian including 1 source packages (libvirt), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2019-20485
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2019-20485
`suse`	medium	CVE-2019-20485 severity moderate: SUSE including 31 source package names (libvirt-4.5.0-36.el7, libvirt-admin-4.5.0-36.el7, …), 31 product×package rows across 1 product lines (SUSE Liberty Linux 7): Fixed 31.	https://www.suse.com/security/cve/CVE-2019-20485/
`ubuntu`	low	CVE-2019-20485 low priority: Ubuntu including 1 source packages (libvirt), 6 status rows across 6 suites (bionic, eoan, focal, trusty, upstream, xenial): not-affected 4, ignored 1, needs-triage 1.	https://ubuntu.com/security/CVE-2019-20485

Affected software / configurations for CVE-2019-20485

Vendor	Product	Version	Raw CPE
redhat	libvirt	< 6.0.0	cpe:2.3:a:redhat:libvirt::::::::
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:::::::*
debian	debian_linux	10.0	cpe:2.3:o:debian:debian_linux:10.0:::::::*
fedoraproject	fedora	31	cpe:2.3:o:fedoraproject:fedora:31:::::::*

References for CVE-2019-20485

URL	Tags
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=953078	Issue Tracking Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1809740	Issue Tracking Vendor Advisory
https://libvirt.org/git/?p=libvirt.git%3Ba=commit%3Bh=a663a860819287e041c3de672aad1d8543098ecc
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D5GE6ISYUL3CIWO3FQRUGMKTKP2NYED2/
https://security-tracker.debian.org/tracker/CVE-2019-20485	Third Party Advisory
https://www.mail-archive.com/debian-bugs-dist%40lists.debian.org/msg1730509.html

URL

CVE-2019-20485

Exploit prediction scoring system (EPSS) score for CVE-2019-20485

Common vulnerability scoring system (CVSS) metrics for CVE-2019-20485

Weakness enumeration for CVE-2019-20485

OS Trackers for CVE-2019-20485

Affected software / configurations for CVE-2019-20485

References for CVE-2019-20485