Description
The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to string objects that result in a negative length, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact by leveraging a script's use of .= with a long string.
Published: 2017-05-12
Score: 9.8 Critical
EPSS: 4.6% Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2017-17863 The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to string objects that result in a negative length, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact by leveraging a script's use of .= with a long string.
Ubuntu USN Ubuntu USN USN-5300-1 PHP vulnerabilities
Ubuntu USN Ubuntu USN USN-5300-2 PHP vulnerabilities
Ubuntu USN Ubuntu USN USN-5300-3 PHP vulnerabilities
History

Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.03922}

epss

{'score': 0.05339}


Fri, 11 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.05271}

epss

{'score': 0.03922}


Fri, 06 Jun 2025 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat enterprise Linux
CPEs cpe:/a:redhat:enterprise_linux:8
Vendors & Products Redhat
Redhat enterprise Linux

Fri, 27 Dec 2024 16:45:00 +0000

Type Values Removed Values Added
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2024-12-27T16:02:56.664Z

Reserved: 2017-05-12T00:00:00.000Z

Link: CVE-2017-8923

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2017-05-12T20:29:00.500

Modified: 2026-05-13T00:24:29.033

Link: CVE-2017-8923

cve-icon Redhat

Severity : Moderate

Publid Date: 2017-05-12T00:00:00Z

Links: CVE-2017-8923 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses