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CVE-2017-17564

25
FAUCET Score

CVE-2017-17564 is a high-severity vulnerability affecting Xen through version 4.9.x, allowing guest OS users to trigger a host OS crash (denial of service) or escalate privileges due to incorrect error handling in shadow mode's reference counting. The attack requires low privileges and high attack complexity, but can lead to complete compromise of confidentiality, integrity, and availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.9.1CPE matchmatch criteria
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.1
Impact Score
6.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.35%
Probability of exploitation in next 30 days
EPSS Percentile
27.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0035 is in the 66th percentile among its peer group of 1,525 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.4 InfoSec Media, 0.1 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xen

Vendor Advisories (1)

redhatCVE-2017-17564Important

xen: improper x86 shadow mode refcount error handling (XSA-250)

Dec 12, 2017

References

lists.debian.org / debian-lts-announce/2018/01/msg00003.html
lists.debian.org / debian-lts-announce/2018/10/msg00009.html
security.gentoo.org / glsa/201801-14
support.citrix.com / article/CTX232096
debian.org / security/2018/dsa-4112
xenbits.xen.org / xsa/advisory-250.html
MitigationPatchVendor Advisory
openwall.com / lists/oss-security/2017/12/12/3
Mailing List
securityfocus.com / bid/102172
securitytracker.com / id/1040770