CVE-2011-0421

CVE-2011-0421 is a medium-severity vulnerability in Php with a CVSS 2.0 base score of 4.3. Its EPSS exploit-prediction score of 14% places it in the 96th percentile, indicating an elevated likelihood of exploitation.

Key facts

Description

The _zip_name_locate function in zip_name_locate.c in the Zip extension in PHP before 5.3.6 does not properly handle a ZIPARCHIVE::FL_UNCHANGED argument, which might allow context-dependent attackers to cause a denial of service (NULL pointer dereference) via an empty ZIP archive that is processed with a (1) locateName or (2) statName operation.

Frequently asked questions

What is CVE-2011-0421?
The _zip_name_locate function in zip_name_locate.c in the Zip extension in PHP before 5.3.6 does not properly handle a ZIPARCHIVE::FL_UNCHANGED argument, which might allow context-dependent attackers to cause a denial of service (NULL pointer dereference) via an empty ZIP archive that is processed with a (1) locateName or (2) statName operation.
How severe is CVE-2011-0421?
CVE-2011-0421 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2011-0421 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-0421?
CVE-2011-0421 primarily affects Php. In total, 110 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-0421?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-0421 published?
CVE-2011-0421 was published on 2011-03-20 and last updated on 2026-06-16.

References

Affected products (110)

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Threat intelligence

Threat-intel indicators referencing this CVE: