Home/CVE/The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to string objects th
CVE

CVE-2017-8923

The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to string objects th

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.

CRITICAL · CVSS 9.8 EPSS 0.04586
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-787Out-of-bounds Write
▤

Affected Products & Versions

2
php< 7.4.24
php>= 8.0.0 and < 8.0.11
⚠

Public Exploits & PoCs

1
pocbugs.php.net · bug.php?id=74577bugs.php.net
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD12 May 2017 · 08:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

15
msrcCVE-2017-8923
siemens-csafSSA-455250
rhsaRHSA-2023:2903Moderate
suse-csafSUSE-SU-2022:4067-1
suse-csafSUSE-SU-2022:4068-1
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.securityfocus.com/bid/98518Third Party AdvisoryVDB Entry
https://security.netapp.com/advisory/ntap-20241227-0007/
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