Security readout for executives and security teams
This is a critical Xen varstored flaw in UEFI variable handling for VMs. A guest-controlled shared buffer can change between checks and use. Sources say default builds may let an attacker control an index used in a jump table, creating serious confidentiality, integrity, and availability risk. Exposure appears limited to Xen environments using varstored for VM UEFI variables with OVMF communication. The bundle lists Xen varstored “all” versions, while also showing defaultStatus as “unaffected”; product scope should be confirmed against Xen XSA-478. Treat this as urgent for Xen virtualization estates because the impact rating is critical and the vulnerable path crosses a guest-to-host boundary. Prioritize confirmation and patch planning, especially for multi-tenant or less-trusted guest environments. Mitigation focus: Review Xen XSA-478 for official affected-version and patch guidance.; Apply vendor-provided Xen or distribution updates when available.; Prioritize hosts running UEFI-enabled VMs that rely on varstored..
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
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ATT&CK lookup starting points
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CWE-367: Exact CWE lookup
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Open ATT&CK lookupCVE-2025-58151 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
- Critical
- CVSS
- 9.4 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
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.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H——XENVulnerability scoring details
Base CVSS 4.0 score
9.4CriticalVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://xenbits.xen.org/xsa/advisory-478.htmlCVE reference, XEN
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.
Time-of-check Time-of-use (TOCTOU) Race Condition
Time-of-check Time-of-use (TOCTOU) Race Condition represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.