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

criticalknown exploitedCVE-2020-1631
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
A path traversal vulnerability in the HTTP/HTTPS service used by J-Web, Web Authentication, Dynamic-VPN (DVPN), Firewall Authentication Pass-Through with Web-Redirect, and Zero Touch Provisioning (ZTP) allows an unauthenticated attacker to perform remote code execution.

CSIRTS triage

vendor: Juniperproduct: Junos OSRemote code executionPath traversal
What
A path traversal vulnerability in Junos OS allows an unauthenticated attacker to perform remote code execution.
Who is affected
Deployments of Junos OS are affected.
Urgency
Remediation is critical due to the severity of the vulnerability and its exploitation status.
Action
Upgrade to the latest version of Junos OS.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-03-25
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-1631

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2020-1631coverage & exploitation statusNVD · CVE.org

Recent advisories for Juniper Junos OS

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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