MEDIUM
CVE-2019-20395
CWE-674Published: January 22, 2020· Updated: Jun 17, 2026
6.5
CVSS v3.1
Official Description
A stack consumption issue is present in libyang before v1.0-r1 due to the self-referential union type containing leafrefs. Applications that use libyang to parse untrusted input yang files may crash.
Technical Analysis
CVE-2019-20395 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Affected Vendors & Products
cesnet1 product(s)
libyang
Source: NVD CPE · 6 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 (10)
→
https://bugzilla.redhat.com/show_bug.cgi?id=1793924Issue Tracking · Third Party Advisory
→
→
https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1Third Party Advisory
→
https://github.com/CESNET/libyang/issues/724Exploit · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1793924Issue Tracking · Third Party Advisory
→
→
https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1Third Party Advisory
→
https://github.com/CESNET/libyang/issues/724Exploit · Third Party Advisory
Quick Facts
CVE IDCVE-2019-20395
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-674
CISA KEVNo
Affected1 vendor(s)
PublishedJan 22, 2020
Related CVEs (CWE-674)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-20395 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.