The (1) SProcRecordCreateContext and (2) SProcRecordRegisterClients functions in the Record extension and the (3) SProcSecurityGenerateAuthorization function in the Security extension in the X server 1.4 in X.Org X11R7.3 allow context-dependent attackers to execute arbitrary code via requests with crafted length values that specify an arbitrary number of bytes to be swapped on the heap, which triggers heap corruption.
Conclusion & alert: CVE-2008-1377 is rated High Risk (65.7/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.70%). 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 | 2026-06-15 | 2.37% | 2.70% | +0.33% |
| 2 | 2025-03-30 | 3.51% | 2.37% | -1.13% |
| 3 | 2025-03-29 | — | 3.51% | — |
Full EPSS history (8 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
|
not yet assigned | CVE-2008-1377 not yet assigned 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-2008-1377 |
gentoo
|
high | CVE-2008-1377: 1 GLSA(s) (200806-07), 1 atom(s) (x11-base/xorg-server); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2008-1377 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2008-1377 |
ubuntu
|
low | CVE-2008-1377 low priority: Ubuntu including 1 source packages (xorg-server), 5 status rows across 5 suites (dapper, feisty, gutsy, hardy, upstream): released 5. | https://ubuntu.com/security/CVE-2008-1377 |