CVE-2019-3863
HIGHCVSS 7.5/10EPSS 3.44%
Last modified
CVE-2019-3863 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. EPSS estimates a 3.44% chance of exploitation in the next 30 days.
Description
A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to copy memory causing in an out of bounds memory write error.
Metrics
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Libssh2 | Libssh2 | < 1.8.1 |
| Debian | Debian Linux | 8.0 |
| Netapp | Ontap Select Deploy Administration Utility | All versions |
| Opensuse | Leap | 15.0 |
| Opensuse | Leap | 42.3 |
| Redhat | Enterprise Linux Desktop | 7.0 |
| Redhat | Enterprise Linux Server | 7.0 |
| Redhat | Enterprise Linux Server Aus | 7.6 |
| Redhat | Enterprise Linux Server Eus | 7.6 |
| Redhat | Enterprise Linux Server Tus | 7.6 |
| Redhat | Enterprise Linux Workstation | 7.0 |
References
- http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.htmlThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0679Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3863Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/03/msg00032.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190327-0005/Third Party Advisory
- https://www.libssh2.org/CVE-2019-3863.htmlPatch, Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.htmlThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0679Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3863Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/03/msg00032.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190327-0005/Third Party Advisory
- https://www.libssh2.org/CVE-2019-3863.htmlPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-3863?
A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to copy memory causing in an out of bounds memory write error.
How severe is CVE-2019-3863?
CVE-2019-3863 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.44% probability of exploitation in the next 30 days.
How do I fix CVE-2019-3863?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2019-3863?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST