CVE-2019-20393

moderate-risk

Published 2020-01-22

A double-free is present in libyang before v1.0-r1 in the function yyparse() when an empty description is used. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.

Do I need to act?

0.29% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 8.8/10 High

NETWORK / LOW complexity

Affected Products (11)

Libyang

Affected Vendors

Cesnet

References (10)

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1793930

Patch https://github.com/CESNET/libyang/commit/d9feacc4a590d35dbc1af21caf9080008b4450e...

Third Party Advisory https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1

Exploit https://github.com/CESNET/libyang/issues/742

https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1793930

Patch https://github.com/CESNET/libyang/commit/d9feacc4a590d35dbc1af21caf9080008b4450e...

Third Party Advisory https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1

Exploit https://github.com/CESNET/libyang/issues/742

https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html

/ 100

moderate-risk

Severity 30/34 · Critical

Exploitability 1/34 · Minimal

Exposure 16/34 · Moderate