How severe is CVE-2009-4421?

CVE-2009-4421 has a CVSS 2.0 base score of 6.5, rated medium severity.

Is CVE-2009-4421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4421?

CVE-2009-4421 primarily affects Alexander Palmo Simple Php Blog. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4421?

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

When was CVE-2009-4421 published?

CVE-2009-4421 was published on 2009-12-24 and last updated on 2026-06-16.

CVE-2009-4421

CVE-2009-4421 is a medium-severity vulnerability in Alexander Palmo Simple Php Blog with a CVSS 2.0 base score of 6.5. 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-22.

Key facts

Severity: Medium (CVSS 2.0 base score 6.5)
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Alexander Palmo Simple Php Blog
Published: 2009-12-24
Last modified: 2026-06-16

Description

Directory traversal vulnerability in languages_cgi.php in Simple PHP Blog 0.5.1 and earlier allows remote authenticated users to include and execute arbitrary local files via a .. (dot dot) in the blog_language1 parameter.

Frequently asked questions

What is CVE-2009-4421?: Directory traversal vulnerability in languages_cgi.php in Simple PHP Blog 0.5.1 and earlier allows remote authenticated users to include and execute arbitrary local files via a .. (dot dot) in the blog_language1 parameter.
How severe is CVE-2009-4421?: CVE-2009-4421 has a CVSS 2.0 base score of 6.5, rated medium severity.
Is CVE-2009-4421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4421?: CVE-2009-4421 primarily affects Alexander Palmo Simple Php Blog. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4421?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-4421 published?: CVE-2009-4421 was published on 2009-12-24 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:a:alexander_palmo:simple_php_blog:*:*:*:*:*:*:*:*
cpe:2.3:a:alexander_palmo:simple_php_blog:0.3.7c:*:*:*:*:*:*:*
cpe:2.3:a:alexander_palmo:simple_php_blog:0.4.0:*:*:*:*:*:*:*
cpe:2.3:a:alexander_palmo:simple_php_blog:0.4.5:*:*:*:*:*:*:*
cpe:2.3:a:alexander_palmo:simple_php_blog:0.4.6:*:*:*:*:*:*:*
cpe:2.3:a:alexander_palmo:simple_php_blog:0.4.7:*:*:*:*:*:*:*
cpe:2.3:a:alexander_palmo:simple_php_blog:0.4.7.1:*:*:*:*:*:*:*
cpe:2.3:a:alexander_palmo:simple_php_blog:0.5.0.1:*:*:*:*:*:*:*

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