The ASN.1 decoder in the QuickDER decoder in Mozilla Network Security Services (NSS) before 3.13.4, as used in Firefox 4.x through 12.0, Firefox ESR 10.x before 10.0.5, Thunderbird 5.0 through 12.0, Thunderbird ESR 10.x before 10.0.5, and SeaMonkey before 2.10, allows remote attackers to cause a denial of service (application crash) via a zero-length item, as demonstrated by (1) a zero-length basic constraint or (2) a zero-length field in an OCSP response.
Conclusion & alert: CVE-2012-0441 is rated Moderate Risk (49.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.94%). 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 | 3.58% | 2.94% | -0.64% |
| 2 | 2026-01-09 | 3.79% | 3.58% | -0.20% |
| 3 | 2025-11-23 | — | 3.79% | — |
Full EPSS history (9 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2012-0441 not yet assigned priority: Debian including 1 source packages (nss), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2012-0441 |
gentoo
|
high | CVE-2012-0441: 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-2012-0441 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2012-0441 |
suse
|
medium | CVE-2012-0441 severity moderate: SUSE including 81 source package names (MozillaFirefox-10.0.5-0.3.6, MozillaFirefox-140.2.0-160000.1.2, …), 97 product×package rows across 30 product lines (SUSE Linux Enterprise Desktop 12, SUSE Linux Enterprise Desktop 12 SP1, … (30 product lines)): Fixed 97. | https://www.suse.com/security/cve/CVE-2012-0441/ |
ubuntu
|
medium | CVE-2012-0441 medium priority: Ubuntu including 6 source packages (firefox, nss, seamonkey, thunderbird, xulrunner-1.9.2, xulrunner-2.0), 54 status rows across 9 suites (hardy, lucid, natty, oneiric, precise, quantal, raring, saucy, upstream): released 21, DNE 16, ignored 10, not-affected 5, needs-triage 2. | https://ubuntu.com/security/CVE-2012-0441 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:*:*:*:*:*:*:* |
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:beta1:*:*:*:*:*:* |
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:beta10:*:*:*:*:*:* |
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:beta11:*:*:*:*:*:* |
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:beta12:*:*:*:*:*:* |
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:beta2:*:*:*:*:*:* |
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:beta3:*:*:*:*:*:* |
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:beta4:*:*:*:*:*:* |
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:beta5:*:*:*:*:*:* |
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:beta6:*:*:*:*:*:* |
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:beta7:*:*:*:*:*:* |
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:beta8:*:*:*:*:*:* |
| mozilla | firefox | 4.0 | cpe:2.3:a:mozilla:firefox:4.0:beta9:*:*:*:*:*:* |
| mozilla | firefox | 4.0.1 | cpe:2.3:a:mozilla:firefox:4.0.1:*:*:*:*:*:*:* |
| mozilla | firefox | 5.0 | cpe:2.3:a:mozilla:firefox:5.0:*:*:*:*:*:*:* |
| mozilla | firefox | 5.0.1 | cpe:2.3:a:mozilla:firefox:5.0.1:*:*:*:*:*:*:* |
| mozilla | firefox | 6.0 | cpe:2.3:a:mozilla:firefox:6.0:*:*:*:*:*:*:* |
| mozilla | firefox | 6.0.1 | cpe:2.3:a:mozilla:firefox:6.0.1:*:*:*:*:*:*:* |
| mozilla | firefox | 6.0.2 | cpe:2.3:a:mozilla:firefox:6.0.2:*:*:*:*:*:*:* |
| mozilla | firefox | 7.0 | cpe:2.3:a:mozilla:firefox:7.0:*:*:*:*:*:*:* |
| mozilla | firefox | 7.0.1 | cpe:2.3:a:mozilla:firefox:7.0.1:*:*:*:*:*:*:* |
| mozilla | firefox | 8.0 | cpe:2.3:a:mozilla:firefox:8.0:*:*:*:*:*:*:* |
| mozilla | firefox | 8.0.1 | cpe:2.3:a:mozilla:firefox:8.0.1:*:*:*:*:*:*:* |
| mozilla | firefox | 9.0 | cpe:2.3:a:mozilla:firefox:9.0:*:*:*:*:*:*:* |
| mozilla | firefox | 9.0.1 | cpe:2.3:a:mozilla:firefox:9.0.1:*:*:*:*:*:*:* |
| mozilla | firefox | 10.0 | cpe:2.3:a:mozilla:firefox:10.0:*:*:*:*:*:*:* |
| mozilla | firefox | 10.0.1 | cpe:2.3:a:mozilla:firefox:10.0.1:*:*:*:*:*:*:* |
| mozilla | firefox | 10.0.2 | cpe:2.3:a:mozilla:firefox:10.0.2:*:*:*:*:*:*:* |
| mozilla | firefox | 10.0.3 | cpe:2.3:a:mozilla:firefox:10.0.3:*:*:*:*:*:*:* |
| mozilla | firefox | 10.0.4 | cpe:2.3:a:mozilla:firefox:10.0.4:*:*:*:*:*:*:* |
| mozilla | firefox | 11.0 | cpe:2.3:a:mozilla:firefox:11.0:*:*:*:*:*:*:* |
| mozilla | firefox | 12.0 | cpe:2.3:a:mozilla:firefox:12.0:*:*:*:*:*:*:* |
| mozilla | firefox | 12.0 | cpe:2.3:a:mozilla:firefox:12.0:beta6:*:*:*:*:*:* |
| mozilla | network_security_services | <= 3.12.3 | cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.2 | cpe:2.3:a:mozilla:network_security_services:3.2:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.2.1 | cpe:2.3:a:mozilla:network_security_services:3.2.1:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.3 | cpe:2.3:a:mozilla:network_security_services:3.3:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.3.1 | cpe:2.3:a:mozilla:network_security_services:3.3.1:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.3.2 | cpe:2.3:a:mozilla:network_security_services:3.3.2:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.4 | cpe:2.3:a:mozilla:network_security_services:3.4:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.4.1 | cpe:2.3:a:mozilla:network_security_services:3.4.1:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.4.2 | cpe:2.3:a:mozilla:network_security_services:3.4.2:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.5 | cpe:2.3:a:mozilla:network_security_services:3.5:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.6 | cpe:2.3:a:mozilla:network_security_services:3.6:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.6.1 | cpe:2.3:a:mozilla:network_security_services:3.6.1:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.7 | cpe:2.3:a:mozilla:network_security_services:3.7:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.7.1 | cpe:2.3:a:mozilla:network_security_services:3.7.1:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.7.2 | cpe:2.3:a:mozilla:network_security_services:3.7.2:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.7.3 | cpe:2.3:a:mozilla:network_security_services:3.7.3:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.7.5 | cpe:2.3:a:mozilla:network_security_services:3.7.5:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.7.7 | cpe:2.3:a:mozilla:network_security_services:3.7.7:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.8 | cpe:2.3:a:mozilla:network_security_services:3.8:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.9 | cpe:2.3:a:mozilla:network_security_services:3.9:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.11.2 | cpe:2.3:a:mozilla:network_security_services:3.11.2:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.11.3 | cpe:2.3:a:mozilla:network_security_services:3.11.3:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.11.4 | cpe:2.3:a:mozilla:network_security_services:3.11.4:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.11.5 | cpe:2.3:a:mozilla:network_security_services:3.11.5:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.12 | cpe:2.3:a:mozilla:network_security_services:3.12:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.12.1 | cpe:2.3:a:mozilla:network_security_services:3.12.1:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.12.2 | cpe:2.3:a:mozilla:network_security_services:3.12.2:*:*:*:*:*:*:* |
| mozilla | seamonkey | <= 2.9 | 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:*:*:*:*:*:*:* |