CRITICAL
xen: NULL pointer deref in event channel poll (XSA-221)
Published Jul 5, 2017
9.1
CRITICALCVSS 3.0
EPSS 2.57%
Description
Xen through 4.8.x does not validate the port numbers of polled event channel ports, which allows guest OS users to cause a denial of service (NULL pointer dereference and host OS crash) or possibly obtain sensitive information, aka XSA-221.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
9.1 CRITICAL NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact None
Availability Impact High
1 other source (Red Hat) ▾
8.5 HIGH Red Hat
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality Impact Low
Integrity Impact None
Availability Impact High
9.4 HIGH NVD
AV:N/AC:L/Au:N/C:C/I:N/A:C
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Complete
Integrity Impact None
Availability Impact Complete
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
2.57% 0.02567
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.02567
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.57% (0.02567) | 84.58th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.57% (0.02567) | 83.05th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.84% (0.00839) | 73.08th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.47% (0.00470) | 76.39th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.47% (0.00470) | 74.84th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.47% (0.00470) | 71.76th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.02% (0.01018) | 38.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.02% (0.01018) | 36.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.55% (0.01550) | 33.66th | v1 |
| Jan 6, 2022 | 1.55% (0.01550) | 32.96th | v1 |
| Sep 1, 2021 | 1.55% (0.01550) | 73.01th | v1 |
| Apr 14, 2021 | 1.55% (0.01550) | 0.00th | v1 |
Weaknesses (1)
References (10)
- http://www.debian.org/security/2017/dsa-3969 vendor-advisoryx_refsource_DEBIAN
- http://www.securityfocus.com/bid/99157 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1038731 vdb-entryx_refsource_SECTRACK
- http://xenbits.xen.org/xsa/advisory-221.html
- https://access.redhat.com/security/cve/CVE-2017-10917 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1458875 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-10917
- https://security.gentoo.org/glsa/201708-03 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2017-10917
- https://xenbits.xen.org/xsa/advisory-221.html x_refsource_CONFIRMMailing ListMitigationThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.debian.org/security/2017/dsa-3969 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.securityfocus.com/bid/99157 | vdb-entryx_refsource_BID | |
| http://www.securitytracker.com/id/1038731 | vdb-entryx_refsource_SECTRACK | |
| http://xenbits.xen.org/xsa/advisory-221.html | ||
| https://access.redhat.com/security/cve/CVE-2017-10917 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1458875 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-10917 | ||
| https://security.gentoo.org/glsa/201708-03 | vendor-advisoryx_refsource_GENTOO | |
| https://www.cve.org/CVERecord?id=CVE-2017-10917 | ||
| https://xenbits.xen.org/xsa/advisory-221.html | x_refsource_CONFIRMMailing ListMitigationThird Party Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jul 5, 2017
Updated Aug 5, 2024
Reserved Jul 4, 2017
Link CVE-2017-10917
CISA Vulnrichment
Updated n/a