CVE-2017-8923
Public on 2017-05-12
Modified on 2025-06-25
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 v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 1 | php | Not Affected | ||
| Amazon Linux 2 - Core | php | Not Affected | ||
| Amazon Linux 2 - Php8.2 Extra | php | Not Affected | ||
| Amazon Linux 1 | php56 | Not Affected | ||
| Amazon Linux 1 | php73 | No Fix Planned | ||
| Amazon Linux 2023 | php8.1 | Not Affected | ||
| Amazon Linux 2023 | php8.2 | Not Affected | ||
| Amazon Linux 2023 | php8.3 | Not Affected | ||
| Amazon Linux 2023 | php8.4 | Not Affected |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | CVSSv3 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | CVSSv2 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |