CVE-2020-1631VulnerabilityPublished 03/25/2022Updated 10/24/2026

CVE-2020-1631: Juniper Junos OS Path Traversal Vulnerability

Affects Juniper Junos OSSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 03/25/2022
KEV deadline: 04/15/2022
EPSS: 4.9% chance of exploitation in 30 days – higher than 92% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2020-1631 (opens in a new tab)

Description

CVE-2020-1631 is a path traversal vulnerability in Juniper Junos OS affecting the HTTP/HTTPS service used by multiple features including J-Web and Zero Touch Provisioning. It allows unauthenticated remote attackers to execute code on the affected system. The vulnerability has been exploited in the wild. No specific affected versions or patch information is provided in the input data.

Summary

This vulnerability involves a path traversal flaw in the HTTP/HTTPS service components of Juniper Junos OS, specifically impacting features such as J-Web, Web Authentication, Dynamic-VPN, Firewall Authentication Pass-Through with Web-Redirect, and Zero Touch Provisioning. An unauthenticated attacker can exploit this flaw to perform remote code execution on the device. The vulnerability is tracked as CVE-2020-1631 and has been observed in active exploitation campaigns. The input data does not include explicit affected version ranges or patch availability details.

Impact

Successful exploitation allows an unauthenticated remote attacker to execute arbitrary code on the affected Junos OS device, potentially leading to full system compromise. This can disrupt network operations and compromise device integrity. The vulnerability has been exploited in the wild, indicating active threat to affected systems.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is confirmed, restrict access to the affected HTTP/HTTPS services and monitor for suspicious activity. Follow Juniper's official advisories for updates and apply patches as soon as they become available.

CVE-2020-1631: Juniper Junos OS Path Traversal Vulnerability

What to do

Description

Summary

Impact

Mitigation

Weaknesses

References

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 11:10:38 UTC

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