What is CVE-2020-10761?

CVE-2020-10761 is a medium-severity vulnerability in Qemu, classified under Reachable Assertion. CVSS score: 5.0/10. Published 2020-06-09.

How severe is CVE-2020-10761?

Medium severity. CVSS v3 base score is 5.0 out of 10.

Is CVE-2020-10761 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Qemu

CVE-2020-10761

An assertion failure issue was found in the Network Block Device(NBD) Server in all QEMU versions before QEMU 5.0.1. This flaw occurs when an nbd-client sends a spec-compliant request that is near the boundary of maximum permitted request length. A remote nbd-client could use this flaw to crash the qemu-nbd server resulting in a denial of service.

Published 2020-06-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.018 (77.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Qemu
Canonical Ubuntu Linux — versions 16.04, 18.04, 20.04
openSUSE Leap — versions 15.2
Red Hat Qemu: — versions all QEMU versions before QEMU 5.0.1
Red Hat Enterprise Linux — versions 8.0

Weakness classification (CWE)

CWE-617 — Reachable Assertion

Public proof-of-concept exploits

Live-Hack-CVE/CVE-2020-10761

References

www.openwall.com/lists/oss-security/2020/06/09/1 (Patch, Mailing List, Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
lists.opensuse.org/opensuse-security-announce/2020-07/msg00086.html (vendor-advisory, Mailing List, Third Party Advisory)
security.netapp.com/advisory/ntap-20200731-0001/ (Third Party Advisory)
usn.ubuntu.com/4467-1/ (vendor-advisory, Third Party Advisory)
security.gentoo.org/glsa/202011-09 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2020-10761?: CVE-2020-10761 is a medium-severity vulnerability in Qemu, classified under Reachable Assertion. CVSS score: 5.0/10. Published 2020-06-09.
How severe is CVE-2020-10761?: Medium severity. CVSS v3 base score is 5.0 out of 10.
Is CVE-2020-10761 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.