CVE-2019-3859 (GCVE-0-2019-3859)
Vulnerability from cvelistv5 – Published: 2019-03-20 21:18 – Updated: 2025-12-18 11:43
VLAI
EPSS
VEX
Summary
An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.
Severity
5 (Medium)
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-18 11:43 UTC
Assigner
References
20 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| The libssh2 Project | libssh2 |
Affected:
1.8.1
|
guessed |
Date Public
2019-03-13 00:00
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"id": "CVE-2019-3859",
"lastModified": "2024-11-21T04:42:44.157",
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"published": "2019-03-21T16:01:04.843",
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"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T11:39:02+00:00",
"cve": "CVE-2019-3859",
"id": "CVE-2019-3859",
"initial_release_date": "2019-03-13T00:00:00+00:00",
"product_status:known_affected": "16",
"product_status:known_not_affected": "4",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "libssh2: Unchecked use of _libssh2_packet_require and _libssh2_packet_requirev resulting in out-of-bounds read",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-3859.json",
"version": "3"
},
"suse_vex": {
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"current_release_date": "2026-08-31T08:30:44Z",
"cve": "CVE-2019-3859",
"id": "CVE-2019-3859",
"initial_release_date": "2023-02-15T04:17:36Z",
"product_status:known_affected": "463",
"product_status:known_not_affected": "76",
"product_status:recommended": "255",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2019-3859",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2019-3859.json",
"version": "44"
},
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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