Integer overflow in Mozilla Firefox and Thunderbird 1.x before 1.5.0.2 and 1.0.x before 1.0.8, Mozilla Suite before 1.7.13, and SeaMonkey before 1.0.1 allows remote attackers to execute arbitrary code via a large number in the CSS letter-spacing property that leads to a heap-based buffer overflow.
Conclusion & alert: CVE-2006-1730 is rated High Risk (65.5/100): CVSS Critical severity, with high exploitation likelihood (EPSS 10.34%, 95th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. 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 | 26.48% | 10.34% | -16.14% |
| 2 | 2025-03-30 | 23.37% | 26.48% | +3.11% |
| 3 | 2025-03-29 | — | 23.37% | — |
Full EPSS history (8 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.3 | 2.0 | HIGH |
|
8.6 | 10.0 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
high | CVE-2006-1730 high priority: Debian including 2 source packages (firefox, thunderbird), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6. | https://security-tracker.debian.org/tracker/CVE-2006-1730 |
gentoo
|
normal | CVE-2006-1730: 3 GLSA(s) (200604-12, 200604-18, 200605-09), 6 atom(s) (mail-client/mozilla-thunderbird, mail-client/mozilla-thunderbird-bin, www-client/mozilla, www-client/mozilla-bin, www-client/mozilla-firefox, www-client/mozilla-firefox-bin); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2006-1730 |
redhat
|
critical | — | https://access.redhat.com/security/cve/CVE-2006-1730 |
ubuntu
|
medium | CVE-2006-1730 medium priority: Ubuntu including 6 source packages (firefox, firefox-granparadiso, lightning-sunbird, midbrowser, mozilla-thunderbird, xulrunner), 24 status rows across 4 suites (dapper, edgy, feisty, upstream): DNE 10, released 8, needs-triage 6. | https://ubuntu.com/security/CVE-2006-1730 |
: Fixed in: Firefox 1.5.0.2 Firefox 1.0.8 Thunderbird 1.5.0.2 Thunderbird 1.0.8 SeaMonkey 1.0.1 Mozilla Suite 1.7.13
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| mozilla | firefox | 1.0 | cpe:2.3:a:mozilla:firefox:1.0:*:*:*:*:*:*:* |
| mozilla | firefox | 1.0.1 | cpe:2.3:a:mozilla:firefox:1.0.1:*:*:*:*:*:*:* |
| mozilla | firefox | 1.0.2 | cpe:2.3:a:mozilla:firefox:1.0.2:*:*:*:*:*:*:* |
| mozilla | firefox | 1.0.3 | cpe:2.3:a:mozilla:firefox:1.0.3:*:*:*:*:*:*:* |
| mozilla | firefox | 1.0.4 | cpe:2.3:a:mozilla:firefox:1.0.4:*:*:*:*:*:*:* |
| mozilla | firefox | 1.0.5 | cpe:2.3:a:mozilla:firefox:1.0.5:*:*:*:*:*:*:* |
| mozilla | firefox | 1.0.6 | cpe:2.3:a:mozilla:firefox:1.0.6:*:*:*:*:*:*:* |
| mozilla | firefox | 1.0.7 | cpe:2.3:a:mozilla:firefox:1.0.7:*:*:*:*:*:*:* |
| mozilla | firefox | 1.5 | cpe:2.3:a:mozilla:firefox:1.5:*:*:*:*:*:*:* |
| mozilla | firefox | 1.5 | cpe:2.3:a:mozilla:firefox:1.5:beta1:*:*:*:*:*:* |
| mozilla | firefox | 1.5 | cpe:2.3:a:mozilla:firefox:1.5:beta2:*:*:*:*:*:* |
| mozilla | firefox | 1.5.0.1 | cpe:2.3:a:mozilla:firefox:1.5.0.1:*:*:*:*:*:*:* |
| mozilla | mozilla_suite | 1.7.6 | cpe:2.3:a:mozilla:mozilla_suite:1.7.6:*:*:*:*:*:*:* |
| mozilla | mozilla_suite | 1.7.7 | cpe:2.3:a:mozilla:mozilla_suite:1.7.7:*:*:*:*:*:*:* |
| mozilla | mozilla_suite | 1.7.8 | cpe:2.3:a:mozilla:mozilla_suite:1.7.8:*:*:*:*:*:*:* |
| mozilla | mozilla_suite | 1.7.10 | cpe:2.3:a:mozilla:mozilla_suite:1.7.10:*:*:*:*:*:*:* |
| mozilla | mozilla_suite | 1.7.11 | cpe:2.3:a:mozilla:mozilla_suite:1.7.11:*:*:*:*:*:*:* |
| mozilla | mozilla_suite | 1.7.12 | cpe:2.3:a:mozilla:mozilla_suite:1.7.12:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.0 | cpe:2.3:a:mozilla:seamonkey:1.0:*:alpha:*:*:*:*:* |
| mozilla | seamonkey | 1.0 | cpe:2.3:a:mozilla:seamonkey:1.0:beta:*:*:*:*:*:* |
| mozilla | thunderbird | 1.0 | cpe:2.3:a:mozilla:thunderbird:1.0:*:*:*:*:*:*:* |
| mozilla | thunderbird | 1.0.1 | cpe:2.3:a:mozilla:thunderbird:1.0.1:*:*:*:*:*:*:* |
| mozilla | thunderbird | 1.0.2 | cpe:2.3:a:mozilla:thunderbird:1.0.2:*:*:*:*:*:*:* |
| mozilla | thunderbird | 1.0.3 | cpe:2.3:a:mozilla:thunderbird:1.0.3:*:*:*:*:*:*:* |
| mozilla | thunderbird | 1.0.4 | cpe:2.3:a:mozilla:thunderbird:1.0.4:*:*:*:*:*:*:* |
| mozilla | thunderbird | 1.0.5 | cpe:2.3:a:mozilla:thunderbird:1.0.5:*:*:*:*:*:*:* |
| mozilla | thunderbird | 1.0.5 | cpe:2.3:a:mozilla:thunderbird:1.0.5:beta:*:*:*:*:*:* |
| mozilla | thunderbird | 1.0.6 | cpe:2.3:a:mozilla:thunderbird:1.0.6:*:*:*:*:*:*:* |
| mozilla | thunderbird | 1.0.7 | cpe:2.3:a:mozilla:thunderbird:1.0.7:*:*:*:*:*:*:* |
| mozilla | thunderbird | 1.5 | cpe:2.3:a:mozilla:thunderbird:1.5:*:*:*:*:*:*:* |
| mozilla | thunderbird | 1.5 | cpe:2.3:a:mozilla:thunderbird:1.5:beta2:*:*:*:*:*:* |
| mozilla | thunderbird | 1.5.0.1 | cpe:2.3:a:mozilla:thunderbird:1.5.0.1:*:*:*:*:*:*:* |