CVE-2020-14145
MEDIUMCVSS 5.9/10EPSS 2.06%
Last modified
CVE-2020-14145 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). EPSS estimates a 2.06% chance of exploitation in the next 30 days.
Description
The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openbsd | Openssh | >= 5.7, < 8.4 |
| Openbsd | Openssh | 8.4 |
| Openbsd | Openssh | 8.5 |
| Openbsd | Openssh | 8.6 |
| Netapp | Aff A700s Firmware | All versions |
| Netapp | Active Iq Unified Manager | >= 9.5 |
| Netapp | Hci Management Node | All versions |
| Netapp | Ontap Select Deploy Administration Utility | All versions |
| Netapp | Solidfire | All versions |
| Netapp | Steelstore Cloud Integrated Storage | All versions |
| Netapp | Hci Compute Node | All versions |
| Netapp | Hci Storage Node | All versions |
References
- http://www.openwall.com/lists/oss-security/2020/12/02/1Mailing List, Patch, Third Party Advisory
- https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362dPatch, Third Party Advisory
- https://docs.ssh-mitm.at/CVE-2020-14145.htmlThird Party Advisory
- https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202105-35Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200709-0004/Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/12/02/1Mailing List, Patch, Third Party Advisory
- https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362dPatch, Third Party Advisory
- https://docs.ssh-mitm.at/CVE-2020-14145.htmlThird Party Advisory
- https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202105-35Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200709-0004/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-14145?
The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected.
How severe is CVE-2020-14145?
CVE-2020-14145 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 2.06% probability of exploitation in the next 30 days.
How do I fix CVE-2020-14145?
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-2020-14145?
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Scan your code nowSource: NVD / NIST