Uninitialized data in endianness conversion in the XEvent handling of the X.Org X Server before 2017-06-19 allowed authenticated malicious u
Uninitialized data in endianness conversion in the XEvent handling of the X.Org X Server before 2017-06-19 allowed authenticated malicious users to access potentially privileged data from the X server.
- Published
- Jul 6, 2017
- Updated
- Jun 16, 2026
- EPSS
- 2.3% · 83th percentile
- CWE
- CWE-665
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Report tools
Action score
27
Monitor
Low priority for now.
- CVSS
- 26 / 40 · 6.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.3%
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| x.org | x server | cpe:2.3:a:x.org:x_server |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- x.org x serverup to 1.19.3 inclusive
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | xorg-server | before 2:1.19.3-2 | 2:1.19.3-2 |
| Debian:7 | xorg-server | before 2:1.12.4-6+deb7u7 | 2:1.12.4-6+deb7u7 |
| Debian:8 | xorg-server | before 2:1.16.4-1+deb8u1 | 2:1.16.4-1+deb8u1 |
| Debian:9 | xorg-server | before 2:1.19.2-1+deb9u1 | 2:1.19.2-1+deb9u1 |
| SUSE:Linux Enterprise Desktop 12 SP2 | xorg-x11-server | before 7.6_1.18.3-74.2 | 7.6_1.18.3-74.2 |
| SUSE:Linux Enterprise Server for SAP Applications 12 | xorg-x11-server | before 7.6_1.15.2-30.22.1 | 7.6_1.15.2-30.22.1 |
| SUSE:Linux Enterprise Software Development Kit 11 SP4 | xorg-x11-server | before 7.4-27.121.2 | 7.4-27.121.2 |
| SUSE:OpenStack Cloud 6 | xorg-x11-server | before 7.6_1.15.2-53.3.1 | 7.6_1.15.2-53.3.1 |
Same product
x.org: all recordsOther highest-scoring records for the same primary product.
- CVE-2023-6816Xorg-x11-server: heap buffer overflow in devicefocusevent and procxiquerypointer40Plan
- CVE-2007-6427The XInput extension in X.Org Xserver before 1.4.1 allows context-dependent attackers to execute arbitrary code via requests related to byte38Monitor
- CVE-2026-56000xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()36Monitor
- CVE-2026-34002Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling36Monitor
- CVE-2026-34000Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.36Monitor
- CVE-2022-46344A vulnerability was found in X.Org.36Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:xorg-server | 2:1.19.3-2 · Debian:12 | Package registry (OSV) |
| suse:xorg-x11-server | 7.4-27.121.2 · SUSE:Linux Enterprise Software Development Kit 11 SP4 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-665 · Improper InitializationCVSS vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- www.debian.org/security/2017/dsa-3905
- www.securityfocus.com/bid/99543
- bugzilla.suse.com/show_bug.cgi?id=1035283
- cgit.freedesktop.org/xorg/xserver/commit/?id=05442de962d3dc624f79fc1a00eca3ffc5489ced
Vendor advisories and official records. Exploit/PoC links are deliberately left out.