CVE-2017-8923

CriticalCVSS 9.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-787

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

http://www.securityfocus.com/bid/98518Third Party Advisory, VDB Entry
https://bugs.php.net/bug.php?id=74577Exploit, Issue Tracking, Vendor Advisory
http://www.securityfocus.com/bid/98518Third Party Advisory, VDB Entry
https://bugs.php.net/bug.php?id=74577Exploit, Issue Tracking, Vendor Advisory
https://security.netapp.com/advisory/ntap-20241227-0007/

Timeline

Published: May 12, 2017
Last modified: Jun 17, 2026
NVD status: Modified

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