Double Free in Cesnet Libyang
CVE-2019-20393
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.
Vulnerability class: Double Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.028 (86.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: +0.000
Affected products
- Cesnet Libyang — versions 0.11, 0.12, 0.13
Weakness classification (CWE)
References
- github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1 (Third Party Advisory)
- github.com/CESNET/libyang/issues/742 (Exploit, Third Party Advisory)
- github.com/CESNET/libyang/commit/d9feacc4a590d35dbc1af21caf9080008b4450ed (Patch, Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- lists.debian.org/debian-lts-announce/2023/09/msg00019.html (mailing-list)
Frequently asked questions
- What is CVE-2019-20393?
- CVE-2019-20393 is a high-severity vulnerability in Cesnet Libyang, classified under Double Free. CVSS score: 8.8/10. Published 2020-01-22.
- How severe is CVE-2019-20393?
- High severity. CVSS v3 base score is 8.8 out of 10.