Multiple vulnerabilities in Mozilla Firefox before 2.0.0.8, Thunderbird before 2.0.0.8, and SeaMonkey before 1.1.5 allow remote attackers to cause a denial of service (crash) via crafted HTML that triggers memory corruption or assert errors.
Conclusion & alert: CVE-2007-5339 is rated Moderate Risk (42.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 3.43%). 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 | 20.93% | 3.43% | -17.50% |
| 2 | 2026-06-09 | 20.30% | 20.93% | +0.63% |
| 3 | 2026-02-26 | — | 20.30% | — |
Full EPSS history (17 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
gentoo
|
normal | CVE-2007-5339: 2 GLSA(s) (200711-14, 200711-24), 7 atom(s) (mail-client/mozilla-thunderbird, mail-client/mozilla-thunderbird-bin, …); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2007-5339 |
redhat
|
critical | — | https://access.redhat.com/security/cve/CVE-2007-5339 |
ubuntu
|
medium | CVE-2007-5339 medium priority: Ubuntu including 3 source packages (firefox, mozilla-thunderbird, thunderbird), 11 status rows across 5 suites (dapper, edgy, feisty, gutsy, upstream): released 10, needs-triage 1. | https://ubuntu.com/security/CVE-2007-5339 |