How severe is CVE-2009-4137?

CVE-2009-4137 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2009-4137 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4137?

CVE-2009-4137 primarily affects Matomo. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4137?

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-2009-4137 published?

CVE-2009-4137 was published on 2009-12-24 and last updated on 2026-06-16.

CVE-2009-4137

CVE-2009-4137 is a high-severity vulnerability in Matomo with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 17% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 17% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Matomo
Published: 2009-12-24
Last modified: 2026-06-16

Description

The loadContentFromCookie function in core/Cookie.php in Piwik before 0.5 does not validate strings obtained from cookies before calling the unserialize function, which allows remote attackers to execute arbitrary code or upload arbitrary files via vectors related to the __destruct function in the Piwik_Config class; php://filter URIs; the __destruct functions in Zend Framework, as demonstrated by the Zend_Log destructor; the shutdown functions in Zend Framework, as demonstrated by the Zend_Log_Writer_Mail class; the render function in the Piwik_View class; Smarty templates; and the _eval function in Smarty.

Frequently asked questions

What is CVE-2009-4137?: The loadContentFromCookie function in core/Cookie.php in Piwik before 0.5 does not validate strings obtained from cookies before calling the unserialize function, which allows remote attackers to execute arbitrary code or upload arbitrary files via vectors related to the __destruct function in the Piwik_Config class; php://filter URIs; the __destruct functions in Zend Framework, as demonstrated by the Zend_Log destructor; the shutdown functions in Zend Framework, as demonstrated by the Zend_Log_Writer_Mail class; the render function in the Piwik_View class; Smarty templates; and the _eval function in Smarty.
How severe is CVE-2009-4137?: CVE-2009-4137 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2009-4137 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4137?: CVE-2009-4137 primarily affects Matomo. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4137?: 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-2009-4137 published?: CVE-2009-4137 was published on 2009-12-24 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:a:matomo:matomo:0.2.25:*:*:*:*:*:*:*
cpe:2.3:a:matomo:matomo:0.2.26:*:*:*:*:*:*:*
cpe:2.3:a:matomo:matomo:0.2.27:*:*:*:*:*:*:*
cpe:2.3:a:matomo:matomo:0.2.28:*:*:*:*:*:*:*
cpe:2.3:a:matomo:matomo:0.2.29:*:*:*:*:*:*:*
cpe:2.3:a:matomo:matomo:0.2.30:*:*:*:*:*:*:*
cpe:2.3:a:matomo:matomo:0.2.31:*:*:*:*:*:*:*
cpe:2.3:a:matomo:matomo:0.2.32:*:*:*:*:*:*:*

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