How severe is CVE-2006-4431?

CVE-2006-4431 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2006-4431 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-4431?

CVE-2006-4431 affects Zend Zend Platform. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2006-4431?

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-2006-4431 published?

CVE-2006-4431 was published on 2006-08-29 and last updated on 2026-06-16.

CVE-2006-4431

CVE-2006-4431 is a high-severity vulnerability in Zend Zend Platform 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-119.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Zend Zend Platform
Published: 2006-08-29
Last modified: 2026-06-16

Description

Multiple buffer overflows in the (a) Session Clustering Daemon and the (b) mod_cluster module in the Zend Platform 2.2.1 and earlier allow remote attackers to cause a denial of service (crash) or execute arbitrary code via a (1) empty or (2) crafted PHP session identifier (PHPSESSID).

Frequently asked questions

What is CVE-2006-4431?: Multiple buffer overflows in the (a) Session Clustering Daemon and the (b) mod_cluster module in the Zend Platform 2.2.1 and earlier allow remote attackers to cause a denial of service (crash) or execute arbitrary code via a (1) empty or (2) crafted PHP session identifier (PHPSESSID).
How severe is CVE-2006-4431?: CVE-2006-4431 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2006-4431 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-4431?: CVE-2006-4431 affects Zend Zend Platform. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2006-4431?: 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-2006-4431 published?: CVE-2006-4431 was published on 2006-08-29 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:zend:zend_platform:*:a:*:*:*:*:*:*

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