CVE-2006-4020

CVE-2006-4020 is a medium-severity vulnerability in Php with a CVSS 2.0 base score of 4.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

scanf.c in PHP 5.1.4 and earlier, and 4.4.3 and earlier, allows context-dependent attackers to execute arbitrary code via a sscanf PHP function call that performs argument swapping, which increments an index past the end of an array and triggers a buffer over-read.

Frequently asked questions

What is CVE-2006-4020?
scanf.c in PHP 5.1.4 and earlier, and 4.4.3 and earlier, allows context-dependent attackers to execute arbitrary code via a sscanf PHP function call that performs argument swapping, which increments an index past the end of an array and triggers a buffer over-read.
How severe is CVE-2006-4020?
CVE-2006-4020 has a CVSS 2.0 base score of 4.6, rated medium severity.
Is CVE-2006-4020 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-4020?
CVE-2006-4020 primarily affects Php. In total, 67 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2006-4020?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2006-4020 published?
CVE-2006-4020 was published on 2006-08-08 and last updated on 2026-06-16.

References

Affected products (67)

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Threat intelligence

Threat-intel indicators referencing this CVE: