HIGH
CVE-2019-19204
CWE-125Published: November 21, 2019· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official Description
An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function fetch_interval_quantifier (formerly known as fetch_range_quantifier) in regparse.c, PFETCH is called without checking PEND. This leads to a heap-based buffer over-read.
Technical Analysis
CVE-2019-19204 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
oniguruma_project1 product(s)
oniguruma
Source: NVD CPE · 5 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (16)
→
https://github.com/ManhNDd/CVE-2019-19204Exploit · Third Party Advisory
→
https://github.com/kkos/oniguruma/issues/162Exploit · Patch · Third Party Advisory
→
https://github.com/tarantula-team/CVE-2019-19204Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/12/msg00002.htmlThird Party Advisory
→
https://github.com/ManhNDd/CVE-2019-19204Exploit · Third Party Advisory
→
https://github.com/kkos/oniguruma/issues/162Exploit · Patch · Third Party Advisory
→
https://github.com/tarantula-team/CVE-2019-19204Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/12/msg00002.htmlThird Party Advisory
Quick Facts
CVE IDCVE-2019-19204
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-125
CISA KEVNo
Affected3 vendor(s)
PublishedNov 21, 2019
Related CVEs (CWE-125)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-19204 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.