CVE-2017-9227

Exp

An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A stack out-of-bounds read occurs in mbc_enc_len() during regular expression searching. Invalid handling of reg->dmin in forward_search_range() could result in an invalid pointer dereference, as an out-of-bounds read from a stack buffer.

Published: 2017-05-24 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]

NVD Status：Modified，CVE State: published

View at NVD, CVE.org, EUVD

Threat Intelligence & Risk Assessment for CVE-2017-9227

EPSS CVSS CWE Exploit-DB Affected OS Tracker

Conclusion & alert: CVE-2017-9227 is rated High Exploit Risk (77.2/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.48%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2017-9227

EDB-ID	Source	Kind	Published	Link
—	nvd_ref	exploit_tag		Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-9227

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-03-04	0.24%	0.48%	+0.24%
2	2026-03-01	0.48%	0.24%	-0.24%
3	2026-02-04	—	0.48%	—

Full EPSS history (50 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-9227

CVSS metrics for this CVE.

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.9	[email protected]
7.5	2.0	HIGH	`AV:N/AC:L/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	10.0	6.4	[email protected]

Weakness enumeration for CVE-2017-9227

CWE-125 MITRE ↗

OS Trackers for CVE-2017-9227

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2017-9227 not yet assigned priority: Debian including 1 source packages (libonig), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2017-9227
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2017-9227
`suse`	low	CVE-2017-9227 severity low: SUSE including 273 source package names (apache2-mod_php5-5.2.14-0.7.30.110.1, apache2-mod_php5-5.5.14-108.1, …), 858 product×package rows across 60 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (60 product lines)): Known Not Affected 558, Fixed 300.	https://www.suse.com/security/cve/CVE-2017-9227/
`ubuntu`	medium	CVE-2017-9227 medium priority: Ubuntu including 4 source packages (libonig, php5, php7.0, php7.1), 25 status rows across 7 suites (artful, bionic, trusty, upstream, xenial, yakkety, zesty): DNE 11, released 6, needs-triage 4, ignored 3, not-affected 1.	https://ubuntu.com/security/CVE-2017-9227

Affected software / configurations for CVE-2017-9227

Vendor	Product	Version	Raw CPE
oniguruma_project	oniguruma	6.2.0	cpe:2.3:a:oniguruma_project:oniguruma:6.2.0:::::::*
php	php	>= 5.6.0, < 5.6.31	cpe:2.3:a:php:php::::::::
php	php	>= 7.0.0, < 7.0.21	cpe:2.3:a:php:php::::::::
php	php	>= 7.1.0, < 7.1.7	cpe:2.3:a:php:php::::::::

References for CVE-2017-9227

URL	Tags
http://www.securityfocus.com/bid/100538	Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2018:1296	Third Party Advisory
https://github.com/kkos/oniguruma/commit/9690d3ab1f9bcd2db8cbe1fe3ee4a5da606b8814	Patch Third Party Advisory
https://github.com/kkos/oniguruma/issues/58	Exploit Issue Tracking Patch Third Party Advisory

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