CVE-2020-25743 [Low] | Security Vulnerability in Qemu

CVE-2020-25743 is rated Low Risk (26.2/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.48%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.04%	0.48%	+0.43%
2	2025-11-21	0.09%	0.04%	-0.04%
3	2025-11-18	—	0.09%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.04%

0.48%

+0.43%

2025-11-21

0.09%

0.04%

-0.04%

2025-11-18

—

0.09%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
3.2	3.1	LOW	`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L` 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:H) They need powerful rights—admin, root, or similar—before this pays off. 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:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	1.5	1.4	[email protected]
2.1	2.0	LOW	`AV:L/AC:L/Au:N/C:N/I:N/A:P` 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:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	3.9	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

3.2

3.1

LOW

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L 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:H): They need powerful rights—admin, root, or similar—before this pays off.
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:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

1.5

1.4

[email protected]

2.1

2.0

LOW

AV:L/AC:L/Au:N/C:N/I:N/A:P 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:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

3.9

2.9

[email protected]

OS Trackers for CVE-2020-25743

vendor	priority	summary	link
`alpine`	low	CVE-2020-25743: 1 source package rows (qemu); 16 state rows across 8 repos (3.10-main, 3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 9.	https://security.alpinelinux.org/vuln/CVE-2020-25743
`debian`	not yet assigned	CVE-2020-25743 not yet assigned priority: Debian including 1 source packages (qemu), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5.	https://security-tracker.debian.org/tracker/CVE-2020-25743
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2020-25743
`suse`	medium	CVE-2020-25743 severity moderate: SUSE including 44 source package names (kvm, qemu, …), 569 product×package rows across 37 product lines (SUSE Enterprise Storage 7, SUSE Enterprise Storage 7.1, … (37 product lines)): Known Not Affected 403, Will Not Fix 166.	https://www.suse.com/security/cve/CVE-2020-25743/
`ubuntu`	low	CVE-2020-25743 low 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, ignored 8, deferred 7, needs-triage 2.	https://ubuntu.com/security/CVE-2020-25743

Affected software / configurations for CVE-2020-25743

Vendor	Product	Version	Raw CPE
qemu	qemu	< 5.1.1	cpe:2.3:a:qemu:qemu::::::::
redhat	openstack_platform	13.0	cpe:2.3:a:redhat:openstack_platform:13.0:::::::*
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::::-:::
redhat	enterprise_linux	8.0	cpe:2.3:o:redhat:enterprise_linux:8.0::::advanced_virtualization:::

References for CVE-2020-25743

URL	Tags
http://www.openwall.com/lists/oss-security/2020/09/29/1	Mailing List Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1881409	Issue Tracking Patch Third Party Advisory
https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05967.html	Patch Third Party Advisory
https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Fide_nullptr1b	Broken Link

URL

CVE-2020-25743

Exploit prediction scoring system (EPSS) score for CVE-2020-25743

Common vulnerability scoring system (CVSS) metrics for CVE-2020-25743

Weakness enumeration for CVE-2020-25743

OS Trackers for CVE-2020-25743

Affected software / configurations for CVE-2020-25743

References for CVE-2020-25743