UBUNTU-CVE-2017-8923

Advisory lineage Upstream: 1 Downstream: 2
Upstream
CVE-2017-8923
Published: 12 May 2017, 20:29
Last modified:22 Apr 2026, 11:35

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

12 May 2017, 20:29
Published
Vulnerability first disclosed
22 Apr 2026, 11:35
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Systems

  • ubuntu•php5

    all

  • ubuntu•php7.0

    < 7.0.33-0ubuntu0.16.04.16+esm3

  • ubuntu•php7.2

    < 7.2.24-0ubuntu0.18.04.11

  • ubuntu•php7.4

    < 7.4.3-4ubuntu2.10

References (5)