How severe is CVE-2007-1522?

CVE-2007-1522 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2007-1522 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-1522?

CVE-2007-1522 primarily affects Php. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-1522?

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

When was CVE-2007-1522 published?

CVE-2007-1522 was published on 2007-03-20 and last updated on 2026-06-16.

CVE-2007-1522

CVE-2007-1522 is a medium-severity vulnerability in Php with a CVSS 2.0 base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 6.8)
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Php
Published: 2007-03-20
Last modified: 2026-06-16

Description

Double free vulnerability in the session extension in PHP 5.2.0 and 5.2.1 allows context-dependent attackers to execute arbitrary code via illegal characters in a session identifier, which is rejected by an internal session storage module, which calls the session identifier generator with an improper environment, leading to code execution when the generator is interrupted, as demonstrated by triggering a memory limit violation or certain PHP errors.

Frequently asked questions

What is CVE-2007-1522?: Double free vulnerability in the session extension in PHP 5.2.0 and 5.2.1 allows context-dependent attackers to execute arbitrary code via illegal characters in a session identifier, which is rejected by an internal session storage module, which calls the session identifier generator with an improper environment, leading to code execution when the generator is interrupted, as demonstrated by triggering a memory limit violation or certain PHP errors.
How severe is CVE-2007-1522?: CVE-2007-1522 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2007-1522 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-1522?: CVE-2007-1522 primarily affects Php. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-1522?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2007-1522 published?: CVE-2007-1522 was published on 2007-03-20 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:php:php:5.2.0:*:*:*:*:*:*:*
cpe:2.3:a:php:php:5.2.1:*:*:*:*:*:*:*

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