What is CVE-2020-25651?

CVE-2020-25651 is a medium-severity vulnerability in Spice-Space Spice-Vdagent, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.4/10. Published 2020-11-26.

How severe is CVE-2020-25651?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Vulnerability in Spice-Space Spice-Vdagent

CVE-2020-25651

A flaw was found in the SPICE file transfer protocol. File data from the host system can end up in full or in parts in the client connection of an illegitimate local user in the VM system. Active file transfers from other users could also be interrupted, resulting in a denial of service. The highest threat from this vulnerability is to data confidentiality as well as system availability. This flaw affects spice-vdagent versions 0.20 and prior.

Vulnerability class: Race Condition

Published 2020-11-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L.

EPSS exploit prediction

EPSS: 0.003 (20.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Spice-Space Spice-Vdagent
Debian Linux — versions 9.0
Fedoraproject Fedora — versions 32, 33
Spice-Vdagent — versions spice-vdagent versions 0.20 and prior

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

www.openwall.com/lists/oss-security/2020/11/04/1 (Exploit, Mailing List, Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
lists.debian.org/debian-lts-announce/2021/01/msg00012.html (mailing-list, Mailing List, Third Party Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)

Frequently asked questions

What is CVE-2020-25651?: CVE-2020-25651 is a medium-severity vulnerability in Spice-Space Spice-Vdagent, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.4/10. Published 2020-11-26.
How severe is CVE-2020-25651?: Medium severity. CVSS v3 base score is 6.4 out of 10.