CVE-2009-2408: n/a vulnerability

CVE-2009-2408: Mozilla Network Security Services (NSS) before 3.12.3, Firefox before 3.0.13, Thunderbird before 2.0.0.23,...

Mozilla Network Security Services (NSS) before 3.12.3, Firefox before 3.0.13, Thunderbird before 2.0.0.23, and SeaMonkey before 1.1.18 do not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority. NOTE: this was originally reported for Firefox before 3.5.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 05:52 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw let attackers positioned between a user and a website make a malicious certificate look valid for another SSL site. For current environments, urgency depends on whether any legacy Mozilla NSS, Firefox, Thunderbird, or SeaMonkey versions remain in use. Exposure is most likely on legacy endpoints, old Linux distributions, embedded systems, or applications still using NSS before 3.12.3 or the listed Mozilla client versions. Treat as high priority only where legacy affected software remains. Modern patched fleets are unlikely to need emergency action, but unmanaged older systems could undermine TLS trust. Mitigation focus: Upgrade NSS to 3.12.3 or later where applicable.; Upgrade Firefox, Thunderbird, and SeaMonkey beyond the affected versions.; Remove unsupported legacy browsers and mail clients from managed systems..

Prepared: Jun 28, 2026, 10:26 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jul 30, 2009, 19:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
oval:org.mitre.oval:def:10751CVE reference · vdb-entry, signature
USN-810-2CVE reference · vendor-advisory, x_refsource_UBUNTU
oval:org.mitre.oval:def:8458CVE reference · vdb-entry, signature
https://bugzilla.redhat.com/show_bug.cgi?id=510251CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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