Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 35.0, Firefox ESR 31.x before 31.4, Thunderbird before 31.4, and SeaMonkey before 2.32 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.
Conclusion & alert: CVE-2014-8634 is rated Moderate Risk (63.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.86%). Core evidence: EPSS rose +2.11% over the last day, indicating growing attacker interest. Mandatory action: Review affected assets and schedule 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 | 1.75% | 3.86% | +2.11% |
| 2 | 2025-12-04 | 1.43% | 1.75% | +0.32% |
| 3 | 2025-03-30 | — | 1.43% | — |
Full EPSS history (12 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 2.0 | HIGH |
|
10.0 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
gentoo
|
normal | CVE-2014-8634: 1 GLSA(s) (201504-01), 7 atom(s) (dev-libs/nspr, mail-client/thunderbird, …); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2014-8634 |
redhat
|
critical | — | https://access.redhat.com/security/cve/CVE-2014-8634 |
suse
|
medium | CVE-2014-8634 severity moderate: SUSE including 149 source package names (MozillaFirefox, MozillaFirefox-102.11.0-150200.152.87.1, …), 319 product×package rows across 81 product lines (Image SLES12-SP5-Azure-BYOS, Image SLES12-SP5-Azure-Basic-On-Demand, … (81 product lines)): Fixed 288, Known Not Affected 31. | https://www.suse.com/security/cve/CVE-2014-8634/ |
ubuntu
|
medium | CVE-2014-8634 medium priority: Ubuntu including 2 source packages (firefox, thunderbird), 10 status rows across 5 suites (lucid, precise, trusty, upstream, utopic): released 8, ignored 2. | https://ubuntu.com/security/CVE-2014-8634 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| mozilla | firefox | 31.0 | cpe:2.3:a:mozilla:firefox:31.0:*:*:*:*:*:*:* |
| mozilla | firefox | 31.1.0 | cpe:2.3:a:mozilla:firefox:31.1.0:*:*:*:*:*:*:* |
| mozilla | firefox | 31.1.1 | cpe:2.3:a:mozilla:firefox:31.1.1:*:*:*:*:*:*:* |
| mozilla | firefox | 31.3.0 | cpe:2.3:a:mozilla:firefox:31.3.0:*:*:*:*:*:*:* |
| mozilla | firefox_esr | 31.2 | cpe:2.3:a:mozilla:firefox_esr:31.2:*:*:*:*:*:*:* |
| mozilla | firefox | <= 34.0.5 | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* |
| mozilla | seamonkey | <= 2.31 | cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:* |
| mozilla | thunderbird | <= 31.3.0 | cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* |