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CVE-2009-3557

18
FAUCET Score

CVE-2009-3557 describes a vulnerability in the tempnam function within PHP versions prior to 5.2.12 and 5.3.1. This flaw allows attackers to bypass safe_mode restrictions and create files in group-writable or world-writable directories by manipulating the 'dir' and 'prefix' arguments. The vulnerability has a CVSS score of 5.0, indicating a medium severity with a network attack vector, low complexity, and potential for partial integrity impact. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 5.2.11CPE matchmatch criteria
cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
1.0CPE matchmatch criteria
cpe:2.3:a:php:php:1.0:*:*:*:*:*:*:*
2.0CPE matchmatch criteria
cpe:2.3:a:php:php:2.0:*:*:*:*:*:*:*
2.0b10CPE matchmatch criteria
cpe:2.3:a:php:php:2.0b10:*:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:php:php:3.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.10%
Probability of exploitation in next 30 days
EPSS Percentile
79.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0210 is in the 69th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2009-3557

php: safe_mode / open_basedir security fixes in 5.3.1

Sep 30, 2009

References

lists.apple.com / archives/security-announce/2010//Mar/msg00001.html
marc.info
news.php.net / php.announce/79
secunia.com / advisories/37412
Vendor Advisory
secunia.com / advisories/37821
secunia.com / advisories/40262
securityreason.com / securityalert/6601
Exploit
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7396
support.apple.com / kb/HT4077
svn.php.net / viewvc/php/php-src/branches/PHP_5_2/ext/standard/file.c
svn.php.net / viewvc/php/php-src/branches/PHP_5_3/ext/standard/file.c
svn.php.net / viewvc
mandriva.com / security/advisories
mandriva.com / security/advisories
mandriva.com / security/advisories
openwall.com / lists/oss-security/2009/11/20/2
Patch
openwall.com / lists/oss-security/2009/11/20/3
Patch
openwall.com / lists/oss-security/2009/11/20/5
Patch
php.net / ChangeLog-5.php
PatchVendor Advisory
php.net / releases/5_2_12.php
php.net / releases/5_3_1.php
PatchVendor Advisory
vupen.com / english/advisories/2009/3593