VDB
CVE-2017-8923
CVE-2017-8923
PUBLISHED
CVSS 9.800000190734863 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 of service (application crash) or possibly have unspecified other impact by leveraging a script's use of .= with a long string.
EPSS 7.19% · 94.1th percentile
Risk Scores
CVSS 3.1
9.800000190734863
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score
7.19%
94.1th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:Pro:14.04:LTS | php5 | 5.5.9+dfsg-1ubuntu1, *, * |
| Ubuntu:18.04:LTS | php7.2 | 7.2.2-1ubuntu1, 7.2.3-1ubuntu1, 7.2.24-0ubuntu0.18.04.4 |
| Ubuntu:20.04:LTS | php7.4 | 0, 7.4.3-4build1, 7.4.3-4ubuntu1 |
| Ubuntu:Pro:16.04:LTS | php7.0 | 7.0.4-5ubuntu1, 7.0.3-9ubuntu1, 7.0.3-3 |
Timeline
- May 12, 2017 CVE Published
- Apr 14, 2021 EPSS Score
- Mar 7, 2023 EPSS Score
- Mar 29, 2025 EPSS Score
- Mar 30, 2025 EPSS Score
- May 1, 2025 EPSS Score
- Jun 1, 2025 EPSS Score
- Jun 4, 2025 EPSS Score
- Jul 1, 2025 EPSS Score
- Jul 4, 2025 EPSS Score
- Jul 16, 2025 EPSS Score
- Jul 18, 2025 EPSS Score
References
- https://ubuntu.com/security/CVE-2017-8923 third-party-advisory
- https://ubuntu.com/security/notices/USN-5300-1 vendor-advisory
- https://ubuntu.com/security/notices/USN-5300-2 vendor-advisory
- https://ubuntu.com/security/notices/USN-5300-3 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2017-8923 third-party-advisory