Is CVE-2017-12178 in the CISA KEV catalog?

No. CVE-2017-12178 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-12178?

CVE-2017-12178 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2017-12178?

CVE-2017-12178 has an EPSS score of 4.25% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-12178?

Upgrade xorg-server on debian 11 to 2:1.19.5-1 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2017-12178

CRITICALEPSS 90th pctl

9.8

CVSS v3

NVD

Description

xorg-x11-server before 1.19.5 had wrong extra length check in ProcXIChangeHierarchy function allowing malicious X client to cause X server to crash or possibly execute arbitrary code.

CWE-391 CWE-20Improper Input Validation

How to fix

Remediation Available

xorg-serverDebian

Fixed in:2:1.19.5-1CVE-2017-12178

xorg-serverUbuntu

Fixed in:2:1.15.1-0ubuntu2.11USN-3456-1

Fixed in:2:1.18.4-0ubuntu0.7USN-3456-1

xorg-server-hwe-16.04Ubuntu

Fixed in:2:1.19.3-1ubuntu1~16.04.4USN-3456-1

xorg-server-lts-xenialUbuntu

Fixed in:2:1.18.3-1ubuntu2.3~trusty4USN-3456-1

xserver-xorg-coreUbuntu

Fixed in:2:1.15.1-0ubuntu2.11USN-3456-1

Fixed in:2:1.18.4-0ubuntu0.7USN-3456-1

xserver-xorg-core-hwe-16.04Ubuntu

Fixed in:2:1.19.3-1ubuntu1~16.04.4USN-3456-1

xserver-xorg-core-lts-xenialUbuntu

Fixed in:2:1.18.3-1ubuntu2.3~trusty4USN-3456-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.25%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Patch2

Third-Party Advisory3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-08-29.