Is CVE-2017-10921 in the CISA KEV catalog?

No. CVE-2017-10921 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-10921?

CVE-2017-10921 has a CVSS v3 base score of 10.0 (CRITICAL).

What is the EPSS score for CVE-2017-10921?

CVE-2017-10921 has an EPSS score of 2.55% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-10921?

Upgrade xen on debian 11 to 4.8.1-1+deb9u3 or later.

CVE & CISA-KEV Catalog

CVE-2017-10921

CRITICALEPSS 83th pctl

10.0

CVSS v3

NVD

Description

The grant-table feature in Xen through 4.8.x does not ensure sufficient type counts for a GNTMAP_device_map and GNTMAP_host_map mapping, which allows guest OS users to cause a denial of service (count mismanagement and memory corruption) or obtain privileged host OS access, aka XSA-224 bug 2.

CWE-119Buffer Overflow

How to fix

Remediation Available

xenDebian

Fixed in:4.8.1-1+deb9u3CVE-2017-10921

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploit Intelligence

2.55%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Patch1

xenbits.xen.org

Other references4

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.