Mozilla Firefox before 41.0, when reader mode is enabled, allows remote attackers to spoof the relationship between address-bar URLs and web content via a crafted web site.
Conclusion & alert: CVE-2015-4508 is rated Low Risk (35.5/100): CVSS Low severity, with medium exploitation likelihood (EPSS 0.70%). 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 | 2026-01-01 | 0.58% | 0.70% | +0.12% |
| 2 | 2025-06-19 | 0.91% | 0.58% | -0.33% |
| 3 | 2025-04-21 | — | 0.91% | — |
Full EPSS history (8 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 2.6 | 2.0 | LOW |
|
4.9 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2015-4508 |
suse
|
medium | — | https://www.suse.com/security/cve/CVE-2015-4508/ |
ubuntu
|
low | CVE-2015-4508 low priority: Ubuntu including 1 source packages (firefox), 4 status rows across 4 suites (precise, trusty, upstream, vivid): released 4. | https://ubuntu.com/security/CVE-2015-4508 |