xorg-x11-server: Insufficient validation of shmseg resource id
Published Oct 9, 2017
4.7
MEDIUMCVSS 3.0
EPSS 0.36%
Description
In X.Org Server (aka xserver and xorg-server) before 1.19.4, an attacker authenticated to an X server with the X shared memory extension enabled can cause aborts of the X server or replace shared memory segments of other X clients in the same session.
Affected products
No data.
Configuration 2
- 8.0
- 9.0
No data.
Red Hat Enterprise Linux 5
xorg-x11-server
Will not fix
Red Hat Enterprise Linux 6
xorg-x11-server
Will not fix
Red Hat Enterprise Linux 7
xorg-x11-server
Will not fix
Red Hat Enterprise Linux 9
xorg-x11-server
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | xorg-x11-server | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | xorg-x11-server | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | xorg-x11-server | Will not fix | n/a |
| Red Hat Enterprise Linux 9 | xorg-x11-server | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
AV:L/AC:M/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
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 3, 2026 | 0.36% (0.00357) | 27.11th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.36% (0.00357) | 27.31th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.08% (0.00080) | 21.14th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00062) | 28.60th | v3 (v2023.03.01) |
| Jun 13, 2024 | 0.06% (0.00062) | 26.61th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00062) | 24.59th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.03% (0.01034) | 41.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.03% (0.01034) | 39.91th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.03% (0.01034) | 37.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.03% (0.01034) | 20.32th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.45% (0.01454) | 32.67th | v1 |
| Jan 6, 2022 | 1.45% (0.01454) | 31.96th | v1 |
| Sep 1, 2021 | 1.45% (0.01454) | 71.88th | v1 |
| Apr 14, 2021 | 1.45% (0.01454) | 0.00th | v1 |
References (10)
- http://www.debian.org/security/2017/dsa-4000 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.openwall.com/lists/oss-security/2017/10/04/10 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/101238 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2017-13721 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1500387 Issue Tracking
- https://cgit.freedesktop.org/xorg/xserver/commit/?id=b95f25af141d33a65f6f821ea9c003f66a01e1f1 x_refsource_CONFIRMThird Party Advisory
- https://lists.x.org/archives/xorg-announce/2017-October/002808.html mailing-listx_refsource_MLISTVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-13721
- https://security.gentoo.org/glsa/201710-30 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2017-13721
| Link | Providers | Tags |
|---|---|---|
| http://www.debian.org/security/2017/dsa-4000 | vendor-advisoryx_refsource_DEBIANThird Party Advisory | |
| http://www.openwall.com/lists/oss-security/2017/10/04/10 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| http://www.securityfocus.com/bid/101238 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2017-13721 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1500387 | Issue Tracking | |
| https://cgit.freedesktop.org/xorg/xserver/commit/?id=b95f25af141d33a65f6f821ea9c003f66a01e1f1 | x_refsource_CONFIRMThird Party Advisory | |
| https://lists.x.org/archives/xorg-announce/2017-October/002808.html | mailing-listx_refsource_MLISTVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-13721 | ||
| https://security.gentoo.org/glsa/201710-30 | vendor-advisoryx_refsource_GENTOOThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2017-13721 |
Change history (0)
No recorded changes yet.