Vulnerability Monitor

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CVE-2017-13721

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.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 4.7, requiring local system access to exploit but requires specific conditions to be met without requiring user interaction requiring only low-level privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 2 products from x.org, from debian organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2017, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2017-10-10T01:30:21.377

Last Modified

2025-08-29T13:42:30.557

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 4.7 (MEDIUM)

CVSSv2 Vector

AV:L/AC:M/Au:N/C:N/I:N/A:P

Access Vector: LOCAL
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

3.4

Impact Score

2.9

Weaknesses

Type: Primary
CWE-269

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	x.org	x_server	≤ 1.19.3	Yes
Operating System	debian	debian_linux	8.0	Yes
Operating System	debian	debian_linux	9.0	Yes

References

http://www.debian.org/security/2017/dsa-4000 Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2017/10/04/10 Mailing List, Third Party Advisory ([email protected])
http://www.securityfocus.com/bid/101238 Third Party Advisory, VDB Entry ([email protected])
https://cgit.freedesktop.org/xorg/xserver/commit/?id=b95f25af141d33a65f6f821ea9c003f66a01e1f1 Third Party Advisory ([email protected])
https://lists.x.org/archives/xorg-announce/2017-October/002808.html Vendor Advisory ([email protected])
https://security.gentoo.org/glsa/201710-30 Third Party Advisory ([email protected])
http://www.debian.org/security/2017/dsa-4000 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2017/10/04/10 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/101238 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://cgit.freedesktop.org/xorg/xserver/commit/?id=b95f25af141d33a65f6f821ea9c003f66a01e1f1 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.x.org/archives/xorg-announce/2017-October/002808.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/201710-30 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For x.org's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.