What is CVE-2017-8923?

CVE-2017-8923 is a critical-severity vulnerability in Php, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2017-05-12.

How severe is CVE-2017-8923?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Php

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 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.

Vulnerability class: Buffer Overflow

EPSS: 0.072 (93.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Php
N/a — versions n/a

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cve@mitre.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_BID)
cve@mitre.org (Exploit, x_refsource_MISC, Issue Tracking, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2017-8923?: CVE-2017-8923 is a critical-severity vulnerability in Php, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2017-05-12.
How severe is CVE-2017-8923?: Critical severity. CVSS v3 base score is 9.8 out of 10.