CVE-2017-8923

CRITICAL
9.8
CVSS Score
Published: May 12, 2017 at 08:00 PM UTC
Updated: June 17, 2026 at 01:27 AM UTC
1 product affected across 1 vendorPHP

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Severity
CRITICAL9.8
Exploit prediction
EPSS 7%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

PHP· PHPdrupal
95%
v < 7.4.248.0.0 ≤ v < 8.0.11
Affected range stops below 7.4.24, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.11, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

VDB Entryx_refsource_BIDThird Party Advisory
http://www.securityfocus.com/bid/98518
x_refsource_MISCExploitIssue TrackingVendor Advisory
https://bugs.php.net/bug.php?id=74577
Source: af854a3a-2127-422b-91ae-364da2661108
https://security.netapp.com/advisory/ntap-20241227-0007/

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-787

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