CVE-2019-19203

Exp

An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function gb18030_mbc_enc_len in file gb18030.c, a UChar pointer is dereferenced without checking if it passed the end of the matched string. This leads to a heap-based buffer over-read.

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

CVE-2019-19203 is rated High Exploit Risk (69.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.65%). 2 public exploit reference(s) are indexed (Exploit-DB). 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-2019-19203

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

Exploit prediction scoring system (EPSS) score for CVE-2019-19203

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 2026-06-03 1.15% 0.65% -0.50%
2 2026-05-25 0.73% 1.15% +0.41%
3 2025-11-21 — 0.73% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-19203

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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: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: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.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/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:L)
Exploitation conditions are straightforward and predictable.
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.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2019-19203

OS Trackers for CVE-2019-19203

vendor priority summary link
alpine high CVE-2019-19203: 1 source package rows (oniguruma); 1 state rows across 1 repos (3.11-main); fixed 0, open 1. https://security.alpinelinux.org/vuln/CVE-2019-19203
debian low CVE-2019-19203 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-2019-19203
redhat medium — https://access.redhat.com/security/cve/CVE-2019-19203
suse high CVE-2019-19203 severity important: SUSE including 288 source package names (1.0.1-2.1:libonig4-6.7.0-150000.3.3.1, 1.5.1-1.5.1:libonig4-6.7.0-150000.3.3.1, …), 458 product×package rows across 153 product lines (Container bci/php, Container bci/php-apache, … (153 product lines)): Fixed 338, Known Affected 100, Will Not Fix 17, Known Not Affected 3. https://www.suse.com/security/cve/CVE-2019-19203/
ubuntu medium CVE-2019-19203 medium priority: Ubuntu including 1 source packages (libonig), 13 status rows across 13 suites (bionic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, trusty, upstream, xenial): not-affected 7, released 4, ignored 2. https://ubuntu.com/security/CVE-2019-19203

Affected software / configurations for CVE-2019-19203

Vendor Product Version Raw CPE
oniguruma_project oniguruma >= 6.0.0, < 6.9.4 cpe:2.3:a:oniguruma_project:oniguruma:*:*:*:*:*:*:*:*
oniguruma_project oniguruma 6.9.4 cpe:2.3:a:oniguruma_project:oniguruma:6.9.4:rc1:*:*:*:*:*:*
fedoraproject fedora 30 cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
fedoraproject fedora 31 cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*

References for CVE-2019-19203

cvelogic Threat Intelligence