The NS_SecurityCompareURIs function in netwerk/base/public/nsNetUtil.h in Mozilla Firefox before 3.5.16 and 3.6.x before 3.6.13, and SeaMonkey before 2.0.11, does not properly handle (1) about:neterror and (2) about:certerror pages, which allows remote attackers to spoof the location bar via a crafted web site.
Conclusion & alert: CVE-2010-3774 is rated Moderate Risk (44.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.01%). 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 | 2026-04-12 | 1.17% | 1.01% | -0.15% |
| 2 | 2025-03-30 | 1.95% | 1.17% | -0.78% |
| 3 | 2025-03-29 | — | 1.95% | — |
Full EPSS history (6 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
|
high | CVE-2010-3774: 1 GLSA(s) (201301-01), 14 atom(s) (dev-libs/nss, mail-client/mozilla-thunderbird, …); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2010-3774 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2010-3774 |
ubuntu
|
medium | CVE-2010-3774 medium priority: Ubuntu including 5 source packages (firefox, firefox-3.0, firefox-3.5, seamonkey, xulrunner-1.9.2), 30 status rows across 6 suites (dapper, hardy, karmic, lucid, maverick, upstream): released 14, DNE 11, needs-triage 3, ignored 2. | https://ubuntu.com/security/CVE-2010-3774 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| mozilla | firefox | 3.6 | cpe:2.3:a:mozilla:firefox:3.6:*:*:*:*:*:*:* |
| mozilla | firefox | 3.6.2 | cpe:2.3:a:mozilla:firefox:3.6.2:*:*:*:*:*:*:* |
| mozilla | firefox | 3.6.3 | cpe:2.3:a:mozilla:firefox:3.6.3:*:*:*:*:*:*:* |
| mozilla | firefox | 3.6.4 | cpe:2.3:a:mozilla:firefox:3.6.4:*:*:*:*:*:*:* |
| mozilla | firefox | 3.6.6 | cpe:2.3:a:mozilla:firefox:3.6.6:*:*:*:*:*:*:* |
| mozilla | firefox | 3.6.7 | cpe:2.3:a:mozilla:firefox:3.6.7:*:*:*:*:*:*:* |
| mozilla | firefox | 3.6.8 | cpe:2.3:a:mozilla:firefox:3.6.8:*:*:*:*:*:*:* |
| mozilla | firefox | 3.6.9 | cpe:2.3:a:mozilla:firefox:3.6.9:*:*:*:*:*:*:* |
| mozilla | firefox | 3.6.10 | cpe:2.3:a:mozilla:firefox:3.6.10:*:*:*:*:*:*:* |
| mozilla | firefox | 3.6.11 | cpe:2.3:a:mozilla:firefox:3.6.11:*:*:*:*:*:*:* |
| mozilla | firefox | 3.6.12 | cpe:2.3:a:mozilla:firefox:3.6.12:*:*:*:*:*:*:* |
| mozilla | seamonkey | <= 2.0.10 | cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.0 | cpe:2.3:a:mozilla:seamonkey:1.0:*:*:*:*:*:*:* |
| 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 | seamonkey | 1.0.1 | cpe:2.3:a:mozilla:seamonkey:1.0.1:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.0.2 | cpe:2.3:a:mozilla:seamonkey:1.0.2:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.0.3 | cpe:2.3:a:mozilla:seamonkey:1.0.3:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.0.4 | cpe:2.3:a:mozilla:seamonkey:1.0.4:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.0.5 | cpe:2.3:a:mozilla:seamonkey:1.0.5:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.0.6 | cpe:2.3:a:mozilla:seamonkey:1.0.6:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.0.7 | cpe:2.3:a:mozilla:seamonkey:1.0.7:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.0.8 | cpe:2.3:a:mozilla:seamonkey:1.0.8:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.0.9 | cpe:2.3:a:mozilla:seamonkey:1.0.9:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1 | cpe:2.3:a:mozilla:seamonkey:1.1:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1 | cpe:2.3:a:mozilla:seamonkey:1.1:alpha:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1 | cpe:2.3:a:mozilla:seamonkey:1.1:beta:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.1 | cpe:2.3:a:mozilla:seamonkey:1.1.1:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.2 | cpe:2.3:a:mozilla:seamonkey:1.1.2:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.3 | cpe:2.3:a:mozilla:seamonkey:1.1.3:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.4 | cpe:2.3:a:mozilla:seamonkey:1.1.4:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.5 | cpe:2.3:a:mozilla:seamonkey:1.1.5:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.6 | cpe:2.3:a:mozilla:seamonkey:1.1.6:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.7 | cpe:2.3:a:mozilla:seamonkey:1.1.7:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.8 | cpe:2.3:a:mozilla:seamonkey:1.1.8:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.9 | cpe:2.3:a:mozilla:seamonkey:1.1.9:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.10 | cpe:2.3:a:mozilla:seamonkey:1.1.10:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.11 | cpe:2.3:a:mozilla:seamonkey:1.1.11:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.12 | cpe:2.3:a:mozilla:seamonkey:1.1.12:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.13 | cpe:2.3:a:mozilla:seamonkey:1.1.13:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.14 | cpe:2.3:a:mozilla:seamonkey:1.1.14:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.15 | cpe:2.3:a:mozilla:seamonkey:1.1.15:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.16 | cpe:2.3:a:mozilla:seamonkey:1.1.16:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.17 | cpe:2.3:a:mozilla:seamonkey:1.1.17:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.18 | cpe:2.3:a:mozilla:seamonkey:1.1.18:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.1.19 | cpe:2.3:a:mozilla:seamonkey:1.1.19:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.5.0.8 | cpe:2.3:a:mozilla:seamonkey:1.5.0.8:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.5.0.9 | cpe:2.3:a:mozilla:seamonkey:1.5.0.9:*:*:*:*:*:*:* |
| mozilla | seamonkey | 1.5.0.10 | cpe:2.3:a:mozilla:seamonkey:1.5.0.10:*:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0 | cpe:2.3:a:mozilla:seamonkey:2.0:*:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0 | cpe:2.3:a:mozilla:seamonkey:2.0:alpha_1:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0 | cpe:2.3:a:mozilla:seamonkey:2.0:alpha_2:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0 | cpe:2.3:a:mozilla:seamonkey:2.0:alpha_3:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0 | cpe:2.3:a:mozilla:seamonkey:2.0:beta_1:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0 | cpe:2.3:a:mozilla:seamonkey:2.0:beta_2:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0 | cpe:2.3:a:mozilla:seamonkey:2.0:rc1:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0 | cpe:2.3:a:mozilla:seamonkey:2.0:rc2:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0.1 | cpe:2.3:a:mozilla:seamonkey:2.0.1:*:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0.2 | cpe:2.3:a:mozilla:seamonkey:2.0.2:*:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0.3 | cpe:2.3:a:mozilla:seamonkey:2.0.3:*:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0.4 | cpe:2.3:a:mozilla:seamonkey:2.0.4:*:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0.5 | cpe:2.3:a:mozilla:seamonkey:2.0.5:*:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0.6 | cpe:2.3:a:mozilla:seamonkey:2.0.6:*:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0.7 | cpe:2.3:a:mozilla:seamonkey:2.0.7:*:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0.8 | cpe:2.3:a:mozilla:seamonkey:2.0.8:*:*:*:*:*:*:* |
| mozilla | seamonkey | 2.0.9 | cpe:2.3:a:mozilla:seamonkey:2.0.9:*:*:*:*:*:*:* |
| mozilla | firefox | <= 3.5.15 | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* |
| mozilla | firefox | 0.1 | cpe:2.3:a:mozilla:firefox:0.1:*:*:*:*:*:*:* |
| mozilla | firefox | 0.2 | cpe:2.3:a:mozilla:firefox:0.2:*:*:*:*:*:*:* |
| mozilla | firefox | 0.3 | cpe:2.3:a:mozilla:firefox:0.3:*:*:*:*:*:*:* |
| mozilla | firefox | 0.4 | cpe:2.3:a:mozilla:firefox:0.4:*:*:*:*:*:*:* |
| mozilla | firefox | 0.5 | cpe:2.3:a:mozilla:firefox:0.5:*:*:*:*:*:*:* |
| mozilla | firefox | 0.6 | cpe:2.3:a:mozilla:firefox:0.6:*:*:*:*:*:*:* |
| mozilla | firefox | 0.6.1 | cpe:2.3:a:mozilla:firefox:0.6.1:*:*:*:*:*:*:* |
| mozilla | firefox | 0.7 | cpe:2.3:a:mozilla:firefox:0.7:*:*:*:*:*:*:* |
| mozilla | firefox | 0.7.1 | cpe:2.3:a:mozilla:firefox:0.7.1:*:*:*:*:*:*:* |
| mozilla | firefox | 0.8 | cpe:2.3:a:mozilla:firefox:0.8:*:*:*:*:*:*:* |
| mozilla | firefox | 0.9 | cpe:2.3:a:mozilla:firefox:0.9:*:*:*:*:*:*:* |
| mozilla | firefox | 0.9 | cpe:2.3:a:mozilla:firefox:0.9:rc:*:*:*:*:*:* |
| mozilla | firefox | 0.9.1 | cpe:2.3:a:mozilla:firefox:0.9.1:*:*:*:*:*:*:* |