CVE-2020-35710

Name: CVE-2020-35710
Creator: NVD / NIST
Published: 2020-12-25T19:15:13.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.66%

Last modified Jun 17, 2026

CVE-2020-35710 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 1.66% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

1.66%

73.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Parallels	Remote Application Server	18.0

References

https://twitter.com/amadapa/status/1342407005110218753Third Party Advisory
https://www.elladodelmal.com/2020/12/blue-team-red-team-como-parallels-ras.htmlExploit, Third Party Advisory
https://twitter.com/amadapa/status/1342407005110218753Third Party Advisory
https://www.elladodelmal.com/2020/12/blue-team-red-team-como-parallels-ras.htmlExploit, Third Party Advisory

Timeline

Published: Dec 25, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35710?

How severe is CVE-2020-35710?

CVE-2020-35710 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.66% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35710?

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.

Are you affected by CVE-2020-35710?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST