CVE-2025-13914 PUBLISHED

Apstra: SSH host key validation vulnerability for managed devices

Assigner: juniper
Reserved: 02.12.2025 Published: 09.04.2026 Updated: 09.04.2026

A Key Exchange without Entity Authentication vulnerability in the SSH implementation of Juniper Networks Apstra allows a unauthenticated, MITM

attacker to impersonate managed devices.

Due to insufficient SSH host key validation an attacker can perform a machine-in-the-middle attack on the SSH connections from Apstra to managed devices, enabling an attacker to impersonate a managed device and capture user credentials.

This issue affects all versions of Apstra before 6.1.1.

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
CVSS Score: 8.7

Attack Vector	Network	Scope	Changed
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/R:U/RE:M
CVSS Score: 7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	High
Attack Complexity	Low	Integrity	None	Integrity	High
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Juniper Networks
Product	Apstra
Versions	Default: unaffected affected from 0 to 6.1.1 (excl.)

Exploits

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

Workarounds

There are no known workarounds for this issue.

Solutions

The following software releases have been updated to resolve this specific issue: Apstra 6.1.1, and all subsequent releases.

Credits

Juniper SIRT would like to acknowledge and thank the Federal Office for Information Security (BSI) for responsibly reporting this vulnerability. finder

References

https://kb.juniper.net/JSA107862

Problem Types

CWE-322 Key Exchange without Entity Authentication CWE