CVE-2019-9023 — Vulnetix

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CVE-2019-9023 PUBLISHED

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.

EPSS 8.11% · 92.1th percentile

Risk Scores

EPSS Score

8.11%

92.1th percentile

Affected Products

Vendor	Product	Versions
Ubuntu:16.04:LTS	php7.0	0, 7.0.1-5, 7.0.1-6
Ubuntu:14.04:LTS	php5	5.5.9+dfsg-1ubuntu4.24, 5.5.9+dfsg-1ubuntu4.25, 5.5.9+dfsg-1ubuntu4.26
Ubuntu:18.04:LTS	php7.2	0, 7.2.1-1ubuntu2, 7.2.2-1ubuntu1

Timeline

CVE Published
Nov 9, 2020 PoC Published
Apr 14, 2021 EPSS Score
Jan 6, 2022 EPSS Score
Apr 1, 2022 EPSS Score
Mar 7, 2023 EPSS Score
Mar 17, 2025 EPSS Score
Mar 29, 2025 EPSS Score
Apr 8, 2025 EPSS Score
May 1, 2025 EPSS Score
May 30, 2025 EPSS Score
Jun 1, 2025 EPSS Score

References

https://ubuntu.com/security/CVE-2019-9023 third-party-advisory
https://ubuntu.com/security/notices/USN-3902-1 vendor-advisory
https://ubuntu.com/security/notices/USN-3902-2 vendor-advisory
https://www.cve.org/CVERecord?id=CVE-2019-9023 third-party-advisory

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