How severe is CVE-2007-4661?

CVE-2007-4661 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2007-4661 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-4661?

CVE-2007-4661 affects Php. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2007-4661?

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-2007-4661 published?

CVE-2007-4661 was published on 2007-09-04 and last updated on 2026-06-16.

CVE-2007-4661

CVE-2007-4661 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. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Php
Published: 2007-09-04
Last modified: 2026-06-16

Description

The chunk_split function in string.c in PHP 5.2.3 does not properly calculate the needed buffer size due to precision loss when performing integer arithmetic with floating point numbers, which has unknown attack vectors and impact, possibly resulting in a heap-based buffer overflow. NOTE: this is due to an incomplete fix for CVE-2007-2872.

Frequently asked questions

What is CVE-2007-4661?: The chunk_split function in string.c in PHP 5.2.3 does not properly calculate the needed buffer size due to precision loss when performing integer arithmetic with floating point numbers, which has unknown attack vectors and impact, possibly resulting in a heap-based buffer overflow. NOTE: this is due to an incomplete fix for CVE-2007-2872.
How severe is CVE-2007-4661?: CVE-2007-4661 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2007-4661 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-4661?: CVE-2007-4661 affects Php. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2007-4661?: 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-2007-4661 published?: CVE-2007-4661 was published on 2007-09-04 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:php:php:5.2.3:*:*:*:*:*:*:*

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