CVE-2019-19333
CVE-2019-19333 is a critical-severity vulnerability in Redhat Enterprise Linux with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 4% (88th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-787
- Affected product: Redhat Enterprise Linux
- Published:
- Last modified:
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 "bits". 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.
Frequently asked questions
- What is CVE-2019-19333?
- 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 "bits". 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.
- How severe is CVE-2019-19333?
- CVE-2019-19333 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2019-19333 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-19333?
- CVE-2019-19333 primarily affects Redhat Enterprise Linux. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2019-19333?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2019-19333 published?
- CVE-2019-19333 was published on 2019-12-06 and last updated on 2026-06-17.
References
- https://access.redhat.com/errata/RHSA-2019:4360
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19333
- https://github.com/CESNET/libyang/commit/f6d684ade99dd37b21babaa8a856f64faa1e2e0d
- 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/
Affected products (16)
- cpe:2.3:a:cesnet:libyang:0.11:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.11:r2:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.12:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.12:r2:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.13:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.13:r2:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.14:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.15:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.16:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.16:r2:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:0.16:r3:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0:r1:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0:r2:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0:r3:*:*:*:*:*:*
- cpe:2.3:a:cesnet:libyang:1.0:r4:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
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