CVE-2019-13225

A NULL Pointer Dereference in match_at() in regexec.c in Oniguruma 6.9.2 allows attackers to potentially cause denial of service by providing a crafted regular expression. Oniguruma issues often affect Ruby, as well as common optional libraries for PHP and Rust.

Published: 2019-07-10 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-13225 is rated Low Risk (37.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.13%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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

Exploit prediction scoring system (EPSS) score for CVE-2019-13225

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 2025-11-21 0.36% 0.13% -0.23%
2 2025-11-18 0.13% 0.36% +0.23%
3 2025-08-30 — 0.13% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-13225

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2019-13225

OS Trackers for CVE-2019-13225

vendor priority summary link
debian low CVE-2019-13225 low 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-2019-13225
gentoo high CVE-2019-13225: 1 GLSA(s) (201911-03), 1 atom(s) (dev-libs/oniguruma); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-13225
redhat medium — https://access.redhat.com/security/cve/CVE-2019-13225
suse medium CVE-2019-13225 severity moderate: SUSE including 283 source package names (1.0.1-2.1:libonig4-6.7.0-150000.3.6.1, 15.7.20.5.1:libonig4-6.7.0-150000.3.6.1, …), 396 product×package rows across 120 product lines (Container bci/php, Container bci/php-apache, … (120 product lines)): Known Affected 205, Fixed 191. https://www.suse.com/security/cve/CVE-2019-13225/
ubuntu medium CVE-2019-13225 medium priority: Ubuntu including 1 source packages (libonig), 7 status rows across 7 suites (bionic, cosmic, disco, eoan, trusty, upstream, xenial): not-affected 4, released 2, ignored 1. https://ubuntu.com/security/CVE-2019-13225

Affected software / configurations for CVE-2019-13225

Vendor Product Version Raw CPE
oniguruma_project oniguruma 6.9.2 cpe:2.3:a:oniguruma_project:oniguruma:6.9.2:-:*:*:*:*:*:*
fedoraproject fedora 29 cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
fedoraproject fedora 30 cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*

References for CVE-2019-13225

cvelogic Threat Intelligence