Integer overflow in ALLOCATE_LOCAL in the ProcXCMiscGetXIDList function in the XC-MISC extension in the X.Org X11 server (xserver) 7.1-1.1.0, and other versions before 20070403, allows remote authenticated users to execute arbitrary code via a large expression, which results in memory corruption.
Conclusion & alert: CVE-2007-1003 is rated High Risk (68.4/100): CVSS Critical severity, with high exploitation likelihood (EPSS 8.01%, 92th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. 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 | 2025-11-23 | 7.72% | 8.01% | +0.29% |
| 2 | 2025-03-30 | 26.34% | 7.72% | -18.61% |
| 3 | 2025-03-29 | — | 26.34% | — |
Full EPSS history (16 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.0 | 2.0 | HIGH |
|
8.0 | 10.0 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
medium | CVE-2007-1003 medium priority: Debian including 1 source packages (xorg-server), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2007-1003 |
gentoo
|
high | CVE-2007-1003: 1 GLSA(s) (200705-10), 2 atom(s) (net-misc/tightvnc, x11-libs/libXfont); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2007-1003 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2007-1003 |
ubuntu
|
medium | CVE-2007-1003 medium priority: Ubuntu including 1 source packages (xorg-server), 4 status rows across 4 suites (dapper, edgy, feisty, upstream): released 3, needs-triage 1. | https://ubuntu.com/security/CVE-2007-1003 |