How severe is CVE-2009-3456?

CVE-2009-3456 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2009-3456 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3456?

CVE-2009-3456 primarily affects Google Chrome. In total, 43 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-3456?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2009-3456 published?

CVE-2009-3456 was published on 2009-09-29 and last updated on 2026-06-16.

CVE-2009-3456

CVE-2009-3456 is a high-severity vulnerability in Google Chrome with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Google Chrome
Published: 2009-09-29
Last modified: 2026-06-16

Description

Google Chrome, possibly 3.0.195.21 and earlier, does 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, a related issue to CVE-2009-2408. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.

Frequently asked questions

What is CVE-2009-3456?: Google Chrome, possibly 3.0.195.21 and earlier, does 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, a related issue to CVE-2009-2408. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
How severe is CVE-2009-3456?: CVE-2009-3456 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2009-3456 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3456?: CVE-2009-3456 primarily affects Google Chrome. In total, 43 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3456?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2009-3456 published?: CVE-2009-3456 was published on 2009-09-29 and last updated on 2026-06-16.

References

http://www.securityfocus.com/bid/36479

Affected products (43)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:0.2.149.27:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:0.2.149.29:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:0.2.149.30:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:0.2.152.1:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:0.2.153.1:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:0.3.154.0:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:0.3.154.3:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:0.4.154.18:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:0.4.154.22:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:0.4.154.31:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:0.4.154.33:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:1.0.154.36:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:1.0.154.39:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:1.0.154.42:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:1.0.154.43:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:1.0.154.46:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:1.0.154.48:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:1.0.154.52:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:1.0.154.53:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:1.0.154.59:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:1.0.154.65:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.156.1:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.157.0:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.157.2:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.158.0:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.159.0:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.169.0:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.169.1:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.170.0:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.172:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.172.2:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.172.8:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.172.27:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.172.28:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.172.30:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.172.31:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.172.33:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.172.37:*:*:*:*:*:*:*
cpe:2.3:a:google:chrome:2.0.172.38:*:*:*:*:*:*:*

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