CVE & CISA-KEV Catalog

CVE-2009-2408

MEDIUMEPSS 92th pctl
5.9
CVSS v3
NVD

Description

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.

CWE-295Improper Certificate Validation

How to fix

Remediation Available
nssDebian
Fixed in:3.12.3-1CVE-2009-2408
Fixed in:3.12.3-1CVE-2009-2408
Fixed in:3.12.3-1CVE-2009-2408
Fixed in:3.12.3-1CVE-2009-2408
DeveloperEditionWindows application
Affected:3.0.13Fixed in:3.0.13Mozilla
Mozilla Firefox (en-US)Windows application
Affected:3.0.13Fixed in:3.0.13Mozilla
Mozilla Thunderbird (en-US)Windows application
Affected:2.0.0.23Fixed in:2.0.0.23Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityHigh
AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

5.74%probability of exploitation in 30 days
92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Third-Party Advisory2
Issue Tracking1
Press / Media1
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.