CVE-2019-3857
HIGHCVSS 8.8/10EPSS 6.13%
Last modified
CVE-2019-3857 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.. EPSS estimates a 6.13% chance of exploitation in the next 30 days.
Description
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Libssh2 | Libssh2 | >= 1.2.8, <= 1.8.0 |
| Debian | Debian Linux | 8.0 |
| Debian | Debian Linux | 9.0 |
| Netapp | Ontap Select Deploy Administration Utility | All versions |
| Opensuse | Leap | 15.0 |
| Opensuse | Leap | 42.3 |
| Redhat | Enterprise Linux | 8.0 |
| 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 |
| Fedoraproject | Fedora | 28 |
| Oracle | Peoplesoft Enterprise Peopletools | 8.56 |
| Oracle | Peoplesoft Enterprise Peopletools | 8.57 |
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://access.redhat.com/errata/RHSA-2019:1175Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1652Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1791Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1943Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2399Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3857Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/03/msg00032.htmlThird Party Advisory
- https://seclists.org/bugtraq/2019/Apr/25Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190327-0005/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4431Third Party Advisory
- https://www.libssh2.org/CVE-2019-3857.htmlPatch, Vendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.htmlPatch, Third Party 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://access.redhat.com/errata/RHSA-2019:1175Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1652Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1791Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1943Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2399Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3857Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/03/msg00032.htmlThird Party Advisory
- https://seclists.org/bugtraq/2019/Apr/25Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190327-0005/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4431Third Party Advisory
- https://www.libssh2.org/CVE-2019-3857.htmlPatch, Vendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-3857?
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.
How severe is CVE-2019-3857?
CVE-2019-3857 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 6.13% probability of exploitation in the next 30 days.
How do I fix CVE-2019-3857?
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-2019-3857?
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Scan your code nowSource: NVD / NIST