9.8crit
CVE-2017-8923in critical feed
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 nega…
Published 9 y ago · modified 4 mo ago · JSON
CVSS
9.8
v3.1 · NVD
CISA KEV
No
not known exploited
EPSS
7.2%
percentile 94%
Public exploits
0
none known
Summary
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.
Exploit prediction (EPSS)
7.19% probability of exploitation in the next 30 days, higher than 94% of all scored CVEs.
CVSS scores
| Assigned by | Version | Score | Vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Classification
- Weakness
- CWE-787 Out-of-bounds Write
- Technology feeds
- PHP (RSS, critical only)
References
- securityfocus.com /bid/98518 · vdb-entry, x_refsource_BID, x_transferred
- bugs.php.net /bug.php?id=74577 · x_refsource_MISC, x_transferred
- security.netapp.com /advisory/ntap-20241227-0007/
Sources
- CVE List: CVE-2017-8923
- NVD: CVE-2017-8923
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