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CVE-2020-35710

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-12-25 · updated 2026-06-17
• Weakness: CWE-200

Description

Parallels Remote Application Server (RAS) 18 allows remote attackers to discover an intranet IP address because submission of the login form (even with blank credentials) provides this address to the attacker's client for use as a "host" value. In other words, after an attacker's web browser sent a request to the login form, it would automatically send a second request to a RASHTML5Gateway/socket.io URI with something like "host":"192.168.###.###" in the POST data.

Affected products

• Parallels Remote Application Server (Client): 18.0

References

• https://twitter.com/amadapa/status/1342407005110218753
• https://www.elladodelmal.com/2020/12/blue-team-red-team-como-parallels-ras.html
• https://twitter.com/amadapa/status/1342407005110218753
• https://www.elladodelmal.com/2020/12/blue-team-red-team-como-parallels-ras.html

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