8.8

CVE-2019-20394: cesnet libyang Double Free

CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2019-20394DEBIAN-CVE-2019-20394
Published 22-01-2020Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2019-20394 is a high (CVSS 8.8) Double Free vulnerability in cesnet libyang. EPSS estimates a 2.81% chance of exploitation in the next 30 days, higher than 86.3% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
46/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
2.81%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 2
DLA-3572-1RHEA-2021:1906

Timeline

  1. 22-01-2020
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

A double-free is present in libyang before v1.0-r3 in the function yyparse() when a type statement in used in a notification statement. 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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

2.81%

Chance of exploitation in the next 30 days

Percentile

86%

Versus all other CVEs

30-day change

+0.02 pp

From 2.79% on 19-09-2026

19-09-202619-10-2026
EPSS score
2.81%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Libyang

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Cesnet1 product
  • libyang0.11:r1 | 0.11:r2 | 0.12:r1 | 0.12:r2 | 0.13:r1 | 0.13:r2 | 0.14:r1 | 0.15:r1 | 0.16:r1 | 0.16:r2 | 0.16:r3 | 1.0:r1 | 1.0:r2
Debian1 product
  • libyang< 1.0.176-1
Ubuntu1 product
  • libyangAll versions (No fix recorded)

3 vendors · 3 products

References

8 links