Security readout for executives and security teams
Plain-English summary
CVE-2020-25652 is a local denial-of-service issue in spice-vdagentd, used in SPICE-enabled virtual guests. An unprivileged user inside the guest can block legitimate agent connections, affecting availability rather than data theft or code execution.
Executive priority
Treat as a targeted availability risk for virtualized Linux guest environments, not a broad remote compromise issue. Remediate through normal patch cycles, faster for shared or business-critical virtual desktop fleets.
Technical view
spice-vdagentd improperly handles client connections to the UNIX domain socket at /run/spice-vdagentd/spice-vdagent-sock. The issue is classified as CWE-770 and affects spice-vdagent versions 0.20 and prior. Sources describe local guest-user denial of service only.
Likely exposure
Exposure is most likely on Linux guest systems running spice-vdagent 0.20 or earlier in SPICE-based virtualization environments. Systems not using spice-vdagent or SPICE guest integration are not indicated as affected by the supplied sources.
Exploitation context
The source bundle does not show KEV listing or active exploitation. Exploitation requires local guest access and appears limited to preventing legitimate spice-vdagentd agent connections, causing availability impact.
Researcher notes
Evidence supports a local UNIX-domain-socket resource-handling flaw in spice-vdagentd. CVSS data is absent in the bundle, and no cited source establishes active exploitation. Do not expand scope beyond spice-vdagent 0.20 and prior without vendor confirmation.
Mitigation direction
- Inventory systems running spice-vdagent and identify versions 0.20 or earlier.
- Apply vendor or distribution security updates for spice-vdagent where available.
- Prioritize shared virtual desktop or multi-user guest environments.
- Check Debian, Fedora, and Red Hat guidance for package-specific remediation.
- If updates are unavailable, restrict local guest access where operationally feasible.
Validation and detection
- Confirm whether affected guests run spice-vdagent 0.20 or earlier.
- Verify the spice-vdagentd service and socket are present on in-scope guests.
- Confirm patched packages are installed after applying distribution updates.
- Review virtualization images and templates for outdated spice-vdagent packages.
- Monitor for user reports of broken SPICE guest-agent integration.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-770: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-25652 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.openwall.com/lists/oss-security/2020/11/04/1CVE reference · x_refsource_MISC
- https://bugzilla.redhat.com/show_bug.cgi?id=1886366CVE reference · x_refsource_MISC
- [debian-lts-announce] 20210113 [SECURITY] [DLA 2524-1] spice-vdagent security updateCVE reference · mailing-list, x_refsource_MLIST
- FEDORA-2021-09ce0cdfacCVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-510977db25CVE reference · vendor-advisory, x_refsource_FEDORA
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Allocation of Resources Without Limits or Throttling
Allocation of Resources Without Limits or Throttling represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.