HOMEVULNERABILITIESCVE-2019-19334
CRITICAL

CVE-2019-19334

CWE-121Published: December 6, 2019· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way libyang parses YANG files with a leaf of type "identityref". An application that uses libyang to parse untrusted YANG files may be vulnerable to this flaw, which would allow an attacker to cause a denial of service or possibly gain code execution.

NVD Source

Technical Analysis

CVE-2019-19334 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

cesnet1 product(s)
libyang
Fedora1 product(s)
fedora
Red Hat1 product(s)
enterprise linux
Source: NVD CPE · 9 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
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Official Patches & Advisories

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19334
PATCHhttps://github.com/CESNET/libyang/commit/6980afae2ff9fcd6d67508b0a3f694d75fd059d6
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19334
PATCHhttps://github.com/CESNET/libyang/commit/6980afae2ff9fcd6d67508b0a3f694d75fd059d6

All References (10)

→
https://access.redhat.com/errata/RHSA-2019:4360
→
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19334Issue Tracking · Patch · Third Party Advisory
→
https://github.com/CESNET/libyang/commit/6980afae2ff9fcd6d67508b0a3f694d75fd059d6Patch · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PETB6TVMFV5KUD4IKVP2JPLBCYHUGSAJ/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RL54JMS7XW7PI6JC4BFSNNLSX5AINQUL/
→
https://access.redhat.com/errata/RHSA-2019:4360
→
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19334Issue Tracking · Patch · Third Party Advisory
→
https://github.com/CESNET/libyang/commit/6980afae2ff9fcd6d67508b0a3f694d75fd059d6Patch · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PETB6TVMFV5KUD4IKVP2JPLBCYHUGSAJ/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RL54JMS7XW7PI6JC4BFSNNLSX5AINQUL/

Quick Facts

CVE IDCVE-2019-19334
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-121
CISA KEVNo
Affected3 vendor(s)
PublishedDec 6, 2019

Related CVEs (CWE-121)

CVE-2026-12846
10.0
CVE-2023-3943
10.0
CVE-2012-10058
10.0
CVE-2026-42996
10.0
CVE-2017-20230
10.0
CVE-2014-9190
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-19334 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.
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