What is CVE-2018-18654?

CVE-2018-18654 is a high-severity vulnerability in Debian Crossroads, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2018-10-26.

How severe is CVE-2018-18654?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Debian Crossroads

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.

Published 2018-10-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (21.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Debian Crossroads — versions 2.81

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

bugs.debian.org/911877 (Mailing List, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2018-18654?: CVE-2018-18654 is a high-severity vulnerability in Debian Crossroads, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2018-10-26.
How severe is CVE-2018-18654?: High severity. CVSS v3 base score is 7.8 out of 10.