Integer overflow in the build_range function in X.Org X Font Server (xfs) before 1.0.5 allows context-dependent attackers to execute arbitrary code via (1) QueryXBitmaps and (2) QueryXExtents protocol requests with crafted size values, which triggers a heap-based buffer overflow.
Conclusion & alert: CVE-2007-4568 is rated Moderate Risk (53.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 3.98%). Mandatory action: Review affected assets and schedule remediation.
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 | 18.16% | 3.98% | -14.19% |
| 2 | 2026-05-24 | 17.59% | 18.16% | +0.57% |
| 3 | 2026-04-12 | — | 17.59% | — |
Full EPSS history (17 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.8 | 2.0 | MEDIUM |
|
8.6 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
gentoo
|
high | CVE-2007-4568: 1 GLSA(s) (200710-11), 1 atom(s) (x11-apps/xfs); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2007-4568 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2007-4568 |
ubuntu
|
medium | CVE-2007-4568 medium priority: Ubuntu including 1 source packages (xfs), 9 status rows across 9 suites (dapper, edgy, feisty, gutsy, hardy, intrepid, jaunty, karmic, upstream): released 5, ignored 3, needed 1. | https://ubuntu.com/security/CVE-2007-4568 |
Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=CVE-2007-4568 The Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw.
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| x.org | x_font_server | 1.0.1 | cpe:2.3:a:x.org:x_font_server:1.0.1:*:*:*:*:*:*:* |
| x.org | x_font_server | 1.0.2 | cpe:2.3:a:x.org:x_font_server:1.0.2:*:*:*:*:*:*:* |
| x.org | x_font_server | 1.0.4 | cpe:2.3:a:x.org:x_font_server:1.0.4:*:*:*:*:*:*:* |