How severe is CVE-2006-4433?

CVE-2006-4433 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2006-4433 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-4433?

CVE-2006-4433 primarily affects Php. In total, 65 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2006-4433?

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-2006-4433 published?

CVE-2006-4433 was published on 2006-08-29 and last updated on 2026-06-16.

CVE-2006-4433

CVE-2006-4433 is a high-severity vulnerability in Php 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.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Php
Published: 2006-08-29
Last modified: 2026-06-16

Description

PHP before 4.4.3 and 5.x before 5.1.4 does not limit the character set of the session identifier (PHPSESSID) for third party session handlers, which might make it easier for remote attackers to exploit other vulnerabilities by inserting PHP code into the PHPSESSID, which is stored in the session file. NOTE: it could be argued that this not a vulnerability in PHP itself, rather a design limitation that enables certain attacks against session handlers that do not account for this limitation.

Frequently asked questions

What is CVE-2006-4433?: PHP before 4.4.3 and 5.x before 5.1.4 does not limit the character set of the session identifier (PHPSESSID) for third party session handlers, which might make it easier for remote attackers to exploit other vulnerabilities by inserting PHP code into the PHPSESSID, which is stored in the session file. NOTE: it could be argued that this not a vulnerability in PHP itself, rather a design limitation that enables certain attacks against session handlers that do not account for this limitation.
How severe is CVE-2006-4433?: CVE-2006-4433 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2006-4433 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-4433?: CVE-2006-4433 primarily affects Php. In total, 65 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2006-4433?: 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-2006-4433 published?: CVE-2006-4433 was published on 2006-08-29 and last updated on 2026-06-16.

References

Affected products (65)

cpe:2.3:a:php:php:4.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:beta_4_patch1:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:beta1:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:beta2:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:beta3:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:beta4:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0:rc2:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.1:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.1:patch1:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.1:patch2:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.2:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.3:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.3:patch1:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.4:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.4:patch1:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.5:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.6:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.7:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.7:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.7:rc2:*:*:*:*:*:*
cpe:2.3:a:php:php:4.0.7:rc3:*:*:*:*:*:*
cpe:2.3:a:php:php:4.1.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.1.1:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.1.2:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.2:*:dev:*:*:*:*:*
cpe:2.3:a:php:php:4.2.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.2.1:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.2.2:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.2.3:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.3.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.3.1:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.3.2:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.3.3:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.3.4:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.3.5:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.3.6:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.3.7:*:*:*:*:*:*:*
cpe:2.3:a:php:php:4.3.8:*:*:*:*:*:*:*

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All CVEs affecting Php →

Threat intelligence

Threat-intel indicators referencing this CVE:

90.160.135.217 (ipv4-addr)
90.160.135.218 (ipv4-addr)
62.36.19.42 (ipv4-addr)
62.36.19.41 (ipv4-addr)