The session_link_x11_socket function in login/logind-session.c in systemd-logind in systemd, possibly 37 and earlier, allows local users to create or overwrite arbitrary files via a symlink attack on the X11 user directory in /run/user/.
Conclusion & alert: CVE-2012-0871 is rated Low Risk (34.9/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.36%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.14% | 0.36% | +0.21% |
| 2 | 2025-03-17 | 0.04% | 0.14% | +0.10% |
| 3 | 2023-03-07 | — | 0.04% | — |
Full EPSS history (4 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.3 | 2.0 | MEDIUM |
|
3.4 | 9.2 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2012-0871 not yet assigned priority: Debian including 1 source packages (systemd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2012-0871 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| systemd_project | systemd | <= 037 | cpe:2.3:a:systemd_project:systemd:*:*:*:*:*:*:*:* |
| systemd_project | systemd | 1 | cpe:2.3:a:systemd_project:systemd:1:*:*:*:*:*:*:* |
| systemd_project | systemd | 2 | cpe:2.3:a:systemd_project:systemd:2:*:*:*:*:*:*:* |
| systemd_project | systemd | 3 | cpe:2.3:a:systemd_project:systemd:3:*:*:*:*:*:*:* |
| systemd_project | systemd | 4 | cpe:2.3:a:systemd_project:systemd:4:*:*:*:*:*:*:* |
| systemd_project | systemd | 5 | cpe:2.3:a:systemd_project:systemd:5:*:*:*:*:*:*:* |
| systemd_project | systemd | 6 | cpe:2.3:a:systemd_project:systemd:6:*:*:*:*:*:*:* |
| systemd_project | systemd | 7 | cpe:2.3:a:systemd_project:systemd:7:*:*:*:*:*:*:* |
| systemd_project | systemd | 8 | cpe:2.3:a:systemd_project:systemd:8:*:*:*:*:*:*:* |
| systemd_project | systemd | 9 | cpe:2.3:a:systemd_project:systemd:9:*:*:*:*:*:*:* |
| systemd_project | systemd | 10 | cpe:2.3:a:systemd_project:systemd:10:*:*:*:*:*:*:* |
| systemd_project | systemd | 11 | cpe:2.3:a:systemd_project:systemd:11:*:*:*:*:*:*:* |
| systemd_project | systemd | 12 | cpe:2.3:a:systemd_project:systemd:12:*:*:*:*:*:*:* |
| systemd_project | systemd | 13 | cpe:2.3:a:systemd_project:systemd:13:*:*:*:*:*:*:* |
| systemd_project | systemd | 14 | cpe:2.3:a:systemd_project:systemd:14:*:*:*:*:*:*:* |
| systemd_project | systemd | 15 | cpe:2.3:a:systemd_project:systemd:15:*:*:*:*:*:*:* |
| systemd_project | systemd | 16 | cpe:2.3:a:systemd_project:systemd:16:*:*:*:*:*:*:* |
| systemd_project | systemd | 17 | cpe:2.3:a:systemd_project:systemd:17:*:*:*:*:*:*:* |
| systemd_project | systemd | 18 | cpe:2.3:a:systemd_project:systemd:18:*:*:*:*:*:*:* |
| systemd_project | systemd | 19 | cpe:2.3:a:systemd_project:systemd:19:*:*:*:*:*:*:* |
| systemd_project | systemd | 20 | cpe:2.3:a:systemd_project:systemd:20:*:*:*:*:*:*:* |
| systemd_project | systemd | 21 | cpe:2.3:a:systemd_project:systemd:21:*:*:*:*:*:*:* |
| systemd_project | systemd | 22 | cpe:2.3:a:systemd_project:systemd:22:*:*:*:*:*:*:* |
| systemd_project | systemd | 23 | cpe:2.3:a:systemd_project:systemd:23:*:*:*:*:*:*:* |
| systemd_project | systemd | 24 | cpe:2.3:a:systemd_project:systemd:24:*:*:*:*:*:*:* |
| systemd_project | systemd | 25 | cpe:2.3:a:systemd_project:systemd:25:*:*:*:*:*:*:* |
| systemd_project | systemd | 26 | cpe:2.3:a:systemd_project:systemd:26:*:*:*:*:*:*:* |
| systemd_project | systemd | 27 | cpe:2.3:a:systemd_project:systemd:27:*:*:*:*:*:*:* |
| systemd_project | systemd | 28 | cpe:2.3:a:systemd_project:systemd:28:*:*:*:*:*:*:* |
| systemd_project | systemd | 29 | cpe:2.3:a:systemd_project:systemd:29:*:*:*:*:*:*:* |
| systemd_project | systemd | 30 | cpe:2.3:a:systemd_project:systemd:30:*:*:*:*:*:*:* |
| systemd_project | systemd | 31 | cpe:2.3:a:systemd_project:systemd:31:*:*:*:*:*:*:* |
| systemd_project | systemd | 32 | cpe:2.3:a:systemd_project:systemd:32:*:*:*:*:*:*:* |
| systemd_project | systemd | 33 | cpe:2.3:a:systemd_project:systemd:33:*:*:*:*:*:*:* |
| systemd_project | systemd | 34 | cpe:2.3:a:systemd_project:systemd:34:*:*:*:*:*:*:* |
| systemd_project | systemd | 35 | cpe:2.3:a:systemd_project:systemd:35:*:*:*:*:*:*:* |
| systemd_project | systemd | 36 | cpe:2.3:a:systemd_project:systemd:36:*:*:*:*:*:*:* |
| opensuse | opensuse | 12.1 | cpe:2.3:o:opensuse:opensuse:12.1:*:*:*:*:*:*:* |