The CERT_VerifyCert function in lib/certhigh/certvfy.c in Mozilla Network Security Services (NSS) 3.15 before 3.15.3 provides an unexpected return value for an incompatible key-usage certificate when the CERTVerifyLog argument is valid, which might allow remote attackers to bypass intended access restrictions via a crafted certificate.
Conclusion & alert: CVE-2013-5606 is rated Moderate Risk (53.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.41%). Core evidence: EPSS rose +1.75% 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 | 0.66% | 2.41% | +1.75% |
| 2 | 2025-03-30 | 2.02% | 0.66% | -1.36% |
| 3 | 2025-03-29 | — | 2.02% | — |
Full EPSS history (9 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.8 | 2.0 | MEDIUM |
|
8.6 | 4.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2013-5606 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-2013-5606 |
gentoo
|
normal | CVE-2013-5606: 2 GLSA(s) (201406-19, 201504-01), 8 atom(s) (dev-libs/nspr, dev-libs/nss, …); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-5606 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2013-5606 |
suse
|
medium | CVE-2013-5606 severity moderate: SUSE including 52 source package names (libfreebl3, libfreebl3-3.15.3-0.3.1, …), 161 product×package rows across 31 product lines (HPE Helion OpenStack 8, SUSE Linux Enterprise Desktop 11 SP2, … (31 product lines)): Fixed 100, Known Not Affected 61. | https://www.suse.com/security/cve/CVE-2013-5606/ |
ubuntu
|
medium | CVE-2013-5606 medium priority: Ubuntu including 1 source packages (nss), 6 status rows across 6 suites (lucid, precise, quantal, raring, saucy, upstream): released 6. | https://ubuntu.com/security/CVE-2013-5606 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| mozilla | network_security_services | 3.15 | cpe:2.3:a:mozilla:network_security_services:3.15:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.15.1 | cpe:2.3:a:mozilla:network_security_services:3.15.1:*:*:*:*:*:*:* |
| mozilla | network_security_services | 3.15.2 | cpe:2.3:a:mozilla:network_security_services:3.15.2:*:*:*:*:*:*:* |