CVE-2016-5773

CVE-2016-5773 is a critical-severity vulnerability in Php with a CVSS 3.x base score of 9.8. 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-416.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• CVSS v2: 7.5
• EPSS exploit prediction: 9% (95th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-416
• Affected product: Php
• Published: 2016-08-07
• Last modified: 2026-06-17

Description

php_zip.c in the zip extension in PHP before 5.5.37, 5.6.x before 5.6.23, and 7.x before 7.0.8 improperly interacts with the unserialize implementation and garbage collection, which allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free and application crash) via crafted serialized data containing a ZipArchive object.

Frequently asked questions

What is CVE-2016-5773?

php_zip.c in the zip extension in PHP before 5.5.37, 5.6.x before 5.6.23, and 7.x before 7.0.8 improperly interacts with the unserialize implementation and garbage collection, which allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free and application crash) via crafted serialized data containing a ZipArchive object.

How severe is CVE-2016-5773?

CVE-2016-5773 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-5773 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-5773?

CVE-2016-5773 primarily affects Php. In total, 41 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-5773?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2016-5773 published?

CVE-2016-5773 was published on 2016-08-07 and last updated on 2026-06-17.

References

• http://github.com/php/php-src/commit/f6aef68089221c5ea047d4a74224ee3deead99a6?w=1
• http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
• http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00004.html
• http://php.net/ChangeLog-5.php
• http://php.net/ChangeLog-7.php
• http://rhn.redhat.com/errata/RHSA-2016-2750.html
• http://www.debian.org/security/2016/dsa-3618
• http://www.openwall.com/lists/oss-security/2016/06/23/4
• http://www.securityfocus.com/bid/91397
• https://bugs.php.net/bug.php?id=72434
• https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731
• https://support.apple.com/HT207170

Affected products (41)

• cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.0:alpha1:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.0:alpha2:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.0:alpha3:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.0:alpha4:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.0:alpha5:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.0:beta1:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.0:beta2:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.0:beta3:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.0:beta4:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.2:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.3:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.4:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.5:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.6:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.7:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.8:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.9:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.10:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.11:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.12:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.13:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.14:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.15:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.16:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.17:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.18:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.19:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.20:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.21:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.22:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.6.23:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:7.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:7.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:7.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:7.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:7.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:7.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:7.0.6:*:*:*:*:*:*:*

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All CVEs affecting Php →

Other CWE-416 (Use After Free) vulnerabilities

• CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
• CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
• CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
• CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
• CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
• CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…

Browse all CWE-416 (Use After Free) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 45.84.120.3 (ipv4-addr)
• 79.137.34.248 (ipv4-addr)
• 221.161.235.168 (ipv4-addr)
• 200.196.50.91 (ipv4-addr)
• 187.51.208.158 (ipv4-addr)
• 187.141.71.166 (ipv4-addr)
• 187.110.238.50 (ipv4-addr)
• 113.164.66.10 (ipv4-addr)