How severe is CVE-2018-18654?

CVE-2018-18654 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-18654 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-18654?

CVE-2018-18654 affects Debian Crossroads. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-18654?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-18654 published?

CVE-2018-18654 was published on 2018-10-26 and last updated on 2026-06-17.

CVE-2018-18654

CVE-2018-18654 is a high-severity vulnerability in Debian Crossroads with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-732.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 7.2
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-732
Affected product: Debian Crossroads
Published: 2018-10-26
Last modified: 2026-06-17

Description

Crossroads 2.81 does not properly handle the /tmp directory during a build of xr. A local attacker can first create a world-writable subdirectory in a certain location under the /tmp directory, wait until a user process copies xr there, and then replace the entire contents of this subdirectory to include a Trojan horse xr.

Frequently asked questions

What is CVE-2018-18654?: Crossroads 2.81 does not properly handle the /tmp directory during a build of xr. A local attacker can first create a world-writable subdirectory in a certain location under the /tmp directory, wait until a user process copies xr there, and then replace the entire contents of this subdirectory to include a Trojan horse xr.
How severe is CVE-2018-18654?: CVE-2018-18654 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-18654 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-18654?: CVE-2018-18654 affects Debian Crossroads. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-18654?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-18654 published?: CVE-2018-18654 was published on 2018-10-26 and last updated on 2026-06-17.

References

https://bugs.debian.org/911877

Affected products (1)

cpe:2.3:a:debian:crossroads:2.81:*:*:*:*:*:*:*

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