How severe is CVE-2009-4017?

CVE-2009-4017 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-4017 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4017?

CVE-2009-4017 primarily affects Php. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4017?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-4017 published?

CVE-2009-4017 was published on 2009-11-24 and last updated on 2026-06-16.

CVE-2009-4017

CVE-2009-4017 is a medium-severity vulnerability in Php with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-770.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 12% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Php
Published: 2009-11-24
Last modified: 2026-06-16

Description

PHP before 5.2.12 and 5.3.x before 5.3.1 does not restrict the number of temporary files created when handling a multipart/form-data POST request, which allows remote attackers to cause a denial of service (resource exhaustion), and makes it easier for remote attackers to exploit local file inclusion vulnerabilities, via multiple requests, related to lack of support for the max_file_uploads directive.

Frequently asked questions

What is CVE-2009-4017?: PHP before 5.2.12 and 5.3.x before 5.3.1 does not restrict the number of temporary files created when handling a multipart/form-data POST request, which allows remote attackers to cause a denial of service (resource exhaustion), and makes it easier for remote attackers to exploit local file inclusion vulnerabilities, via multiple requests, related to lack of support for the max_file_uploads directive.
How severe is CVE-2009-4017?: CVE-2009-4017 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-4017 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4017?: CVE-2009-4017 primarily affects Php. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4017?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-4017 published?: CVE-2009-4017 was published on 2009-11-24 and last updated on 2026-06-16.

References

Affected products (14)

cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.3.0:-:*:*:*:*:*:*
cpe:2.3:a:php:php:5.3.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.3.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:php:php:5.3.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:php:php:5.3.0:beta1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.3.0:rc1:*:*:*:*:*:*
cpe:2.3:a:php:php:5.3.0:rc2:*:*:*:*:*:*
cpe:2.3:a:php:php:5.3.0:rc3:*:*:*:*:*:*
cpe:2.3:a:php:php:5.3.0:rc4:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x:10.6.3:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:4.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

222.99.52.202 (ipv4-addr)
82.199.197.245 (ipv4-addr)
58.221.244.34 (ipv4-addr)
223.82.97.51 (ipv4-addr)
121.164.135.251 (ipv4-addr)
90.160.135.217 (ipv4-addr)
76.133.97.153 (ipv4-addr)
183.6.115.88 (ipv4-addr)