CVE-2020-29040: n/a vulnerability

CVE-2020-29040: An issue was discovered in Xen through 4.14.x allowing x86 HVM guest OS users to cause a denial of service...

An issue was discovered in Xen through 4.14.x allowing x86 HVM guest OS users to cause a denial of service (stack corruption), cause a data leak, or possibly gain privileges because of an off-by-one error. NOTE: this issue is caused by an incorrect fix for CVE-2020-27671.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 4, 2024, 16:48 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2020-29040 affects Xen hypervisors through 4.14.x. A user inside an x86 HVM guest could trigger stack corruption in the host-side virtualization layer, leading to denial of service, data leakage, or possible privilege gain. The issue came from an incomplete correction for an earlier Xen flaw. Organizations using Xen through 4.14.x with x86 HVM guest workloads are the most relevant exposure group. Evidence in the supplied bundle does not identify specific downstream distributions, cloud providers, appliances, or package versions beyond Xen itself. Treat this as high priority for Xen-based virtualization, especially multi-tenant or externally managed guest environments. No active exploitation is cited, but the potential host impact makes delayed remediation risky. Mitigation focus: Review Xen Security Advisory 355 for vendor-approved patches and version guidance.; Prioritize remediation on Xen hosts running untrusted or multi-tenant x86 HVM guests.; Limit untrusted HVM guest placement until vendor guidance is applied..

Prepared: Jun 5, 2026, 13:31 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Nov 24, 2020, 16:07 UTC (UTC+00:00)

Official CVE source material

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.

0CVSS vectors

0Timeline events

0ADP providers

2Source links

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://xenbits.xen.org/xsa/advisory-355.htmlCVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

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Weakness

CWE details

No CWE listed

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