The bdfReadCharacters function in bitmap/bdfread.c in X.Org libXfont before 1.4.9 and 1.5.x before 1.5.1 does not properly perform type conversion for metrics values, which allows remote authenticated users to cause a denial of service (out-of-bounds memory access) and possibly execute arbitrary code via a crafted BDF font file.
Conclusion & alert: CVE-2015-1804 is rated High Risk (65.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.07%). Mandatory action: High exploitation likelihood—assess exposure and prioritize 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 | 2026-05-13 | 2.30% | 3.07% | +0.77% |
| 2 | 2026-03-03 | 2.44% | 2.30% | -0.13% |
| 3 | 2025-12-28 | — | 2.44% | — |
Full EPSS history (15 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 8.5 | 2.0 | HIGH |
|
6.8 | 10.0 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2015-1804 not yet assigned priority: Debian including 1 source packages (libxfont), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2015-1804 |
gentoo
|
normal | CVE-2015-1804: 1 GLSA(s) (201507-21), 1 atom(s) (x11-libs/libXfont); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-1804 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2015-1804 |
ubuntu
|
medium | CVE-2015-1804 medium priority: Ubuntu including 1 source packages (libxfont), 5 status rows across 5 suites (lucid, precise, trusty, upstream, utopic): released 5. | https://ubuntu.com/security/CVE-2015-1804 |