A flaw was found in the X server's request handling. Non-zero 'bytes to ignore' in a client's request can cause the server to skip processing another client's request, potentially leading to a denial of service.
Conclusion & alert: CVE-2025-49178 is rated Low Risk (36.5/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.19%). 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 | 2026-04-13 | 0.06% | 0.19% | +0.13% |
| 2 | 2025-12-16 | 0.05% | 0.06% | +0.02% |
| 3 | 2025-12-14 | — | 0.05% | — |
Full EPSS history (7 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.5 | 3.1 | MEDIUM |
|
1.8 | 3.6 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2025-49178: 2 source package rows (xorg-server, xwayland); 4 state rows across 2 repos (3.22-community, edge-community); fixed 4, open 0. | https://security.alpinelinux.org/vuln/CVE-2025-49178 |
debian
|
not yet assigned | CVE-2025-49178 not yet assigned priority: Debian including 2 source packages (xorg-server, xwayland), 9 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 7, open 2. | https://security-tracker.debian.org/tracker/CVE-2025-49178 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2025-49178 |
suse
|
medium | CVE-2025-49178 severity moderate: SUSE including 320 source package names (21.1-46.1:xorg-x11-server-21.1.11-150600.5.12.1, 21.1-46.1:xorg-x11-server-Xvfb-21.1.11-150600.5.12.1, …), 406 product×package rows across 57 product lines (Container suse/kiosk/xorg, Image SLES15-SP4-SAP, … (57 product lines)): Known Affected 231, Fixed 174, Known Not Affected 1. | https://www.suse.com/security/cve/CVE-2025-49178/ |
ubuntu
|
medium | CVE-2025-49178 medium priority: Ubuntu including 7 source packages (xorg, xorg-hwe-16.04, …), 53 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 20, released 17, not-affected 13, needs-triage 3. | https://ubuntu.com/security/CVE-2025-49178 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| No affected products in dataset. | |||