Is CVE-2019-9023 in the CISA KEV catalog?

No. CVE-2019-9023 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-9023?

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

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

CVE-2019-9023 has an EPSS score of 9.32% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-9023?

Upgrade libapache2-mod-php5 on ubuntu 14.04 to 5.5.9+dfsg-1ubuntu4.27 or later. Fixes are available for 13 affected products.

CVE & CISA-KEV Catalog

CVE-2019-9023

CRITICALEPSS 95th pctl

9.8

CVSS v3

NVD

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.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

libapache2-mod-php5Ubuntu

Fixed in:5.5.9+dfsg-1ubuntu4.27USN-3902-1

libapache2-mod-php7.0Ubuntu

Fixed in:7.0.33-0ubuntu0.16.04.2USN-3902-1

php5Ubuntu

Fixed in:5.5.9+dfsg-1ubuntu4.27USN-3902-1

php5-cgiUbuntu

Fixed in:5.5.9+dfsg-1ubuntu4.27USN-3902-1

php5-cliUbuntu

Fixed in:5.5.9+dfsg-1ubuntu4.27USN-3902-1

php5-fpmUbuntu

Fixed in:5.5.9+dfsg-1ubuntu4.27USN-3902-1

php5-xmlrpcUbuntu

Fixed in:5.5.9+dfsg-1ubuntu4.27USN-3902-1

php7.0Ubuntu

Fixed in:7.0.33-0ubuntu0.16.04.2USN-3902-1

php7.0-cgiUbuntu

Fixed in:7.0.33-0ubuntu0.16.04.2USN-3902-1

php7.0-cliUbuntu

Fixed in:7.0.33-0ubuntu0.16.04.2USN-3902-1

php7.0-fpmUbuntu

Fixed in:7.0.33-0ubuntu0.16.04.2USN-3902-1

php7.0-mbstringUbuntu

Fixed in:7.0.33-0ubuntu0.16.04.2USN-3902-1

php7.0-xmlrpcUbuntu

Fixed in:7.0.33-0ubuntu0.16.04.2USN-3902-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

9.32%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Patch8

Third-Party Advisory7

Other references4

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.