CVE-2015-4021: n/a vulnerability

CVE-2015-4021: The phar_parse_tarfile function in ext/phar/tar.c in PHP before 5.4.41, 5.5.x before 5.5.25, and 5.6.x befo...

The phar_parse_tarfile function in ext/phar/tar.c in PHP before 5.4.41, 5.5.x before 5.5.25, and 5.6.x before 5.6.9 does not verify that the first character of a filename is different from the \0 character, which allows remote attackers to cause a denial of service (integer underflow and memory corruption) via a crafted entry in a tar archive.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 06:04 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2015-4021 is a PHP archive-parsing flaw that can crash or corrupt memory when PHP handles a specially crafted tar archive. The cited record describes denial of service, not confirmed data theft or remote code execution. Business urgency is highest for legacy systems that still run affected PHP 5.x versions and accept untrusted archive uploads. Exposure is most plausible where legacy PHP 5.x processes user-supplied tar or PHAR-related archive content. Systems already upgraded beyond the fixed PHP versions, or using maintained distribution backports, are less likely exposed. The provided affected-product metadata is incomplete, so asset validation must rely on PHP and OS package versions. Prioritize as a legacy-platform reliability risk. It is not KEV-listed in the provided bundle, but unsupported PHP 5.x with archive-upload functionality should be remediated promptly because attackers can trigger service disruption remotely. Mitigation focus: Upgrade PHP to 5.4.41, 5.5.25, 5.6.9, or a supported fixed vendor build.; Apply relevant vendor advisories for affected Linux, Apple, or Oracle-distributed PHP packages.; Identify services that accept archive uploads or process untrusted tar files through PHP..

Prepared: Jun 13, 2026, 22:39 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jun 9, 2015, 18:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://bugs.php.net/bug.php?id=69453CVE reference · x_refsource_CONFIRM
https://support.apple.com/kb/HT205031CVE reference · x_refsource_CONFIRM
GLSA-201606-10CVE reference · vendor-advisory, x_refsource_GENTOO

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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