CRITICAL

CVE-2019-9023

CVSS v3

9.8

CRITICAL

EPSS Score

11.5%

exploit probability

CISA KEV

No

known exploited

Exploitation

SSVC status

Description

An issue was discovered in PHP before 5.6.40, 7.x before 7.1.26, 7.2.x before 7.2.14, and 7.3.x before 7.3.1. A number of heap-based buffer over-read instances are present in mbstring regular expression functions when supplied with invalid multibyte data. These occur in ext/mbstring/oniguruma/regcomp.c, ext/mbstring/oniguruma/regexec.c, ext/mbstring/oniguruma/regparse.c, ext/mbstring/oniguruma/enc/unicode.c, and ext/mbstring/oniguruma/src/utf32_be.c when a multibyte regular expression pattern contains invalid multibyte sequences.

Technical details

Published
2/22/2019

Frequently asked questions

What is CVE-2019-9023?

An issue was discovered in PHP before 5.6.40, 7.x before 7.1.26, 7.2.x before 7.2.14, and 7.3.x before 7.3.1. A number of heap-based buffer over-read instances are present in mbstring regular expression functions when supplied with invalid multibyte data. These occur in ext/mbstring/oniguruma/regcomp.c, ext/mbstring/oniguruma/regexec.c, ext/mbstring/oniguruma/regparse.c, ext/mbstring/oniguruma/enc/unicode.c, and ext/mbstring/oniguruma/src/utf32_be.c when a multibyte regular expression pattern contains invalid multibyte sequences.

Is CVE-2019-9023 actively exploited?

Active exploitation of CVE-2019-9023 has not been confirmed. The EPSS score is 11.5%, indicating the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-9023?

CVE-2019-9023 has a CVSS v3 base score of 9.8 (CRITICAL severity).

Is CVE-2019-9023 affecting your environment?

Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.