Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Php | Php | < 7.4.24 |
Related Weaknesses (CWE)
References
- http://www.securityfocus.com/bid/98518Third Party AdvisoryVDB Entry
- https://bugs.php.net/bug.php?id=74577ExploitIssue TrackingVendor Advisory
- http://www.securityfocus.com/bid/98518Third Party AdvisoryVDB Entry
- https://bugs.php.net/bug.php?id=74577ExploitIssue TrackingVendor Advisory
- https://security.netapp.com/advisory/ntap-20241227-0007/
FAQ
What is CVE-2017-8923?
CVE-2017-8923 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 ...
How severe is CVE-2017-8923?
CVE-2017-8923 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2017-8923?
Check the references section above for vendor advisories and patch information. Affected products include: Php Php.