What is CVE-2020-25743?

CVE-2020-25743 is a low-severity vulnerability in Qemu, classified under NULL Pointer Dereference. CVSS score: 3.2/10. Published 2020-10-06.

How severe is CVE-2020-25743?

Low severity. CVSS v3 base score is 3.2 out of 10.

NULL pointer dereference in Qemu

CVE-2020-25743

hw/ide/pci.c in QEMU before 5.1.1 can trigger a NULL pointer dereference because it lacks a pointer check before an ide_cancel_dma_sync call.

Published 2020-10-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.2 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.005 (38.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Qemu
Red Hat Enterprise Linux — versions 7.0, 8.0
Red Hat OpenStack Platform — versions 13.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

lists.nongnu.org/archive/html/qemu-devel/2020-09/msg05967.html (Patch, Third Party Advisory)
ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE (Broken Link)
www.openwall.com/lists/oss-security/2020/09/29/1 (Patch, Mailing List, Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-25743?: CVE-2020-25743 is a low-severity vulnerability in Qemu, classified under NULL Pointer Dereference. CVSS score: 3.2/10. Published 2020-10-06.
How severe is CVE-2020-25743?: Low severity. CVSS v3 base score is 3.2 out of 10.