CVE-2020-13872Public exploit

Tunnel access via wildcard forwarding listener

Published Jun 9, 2020 · Updated Aug 4, 2024

Authentication bypass in RoyalApps Royal TS before 5 allows remote attackers to access active Secure Gateway tunnels without credentials. Royal TS binds each temporary Secure Gateway forwarding port above 50000 to 0.0.0.0 instead of the loopback interface, exposing the authenticated tunnel to the local network. An attacker on that network can find an open port and reach an internal SSH, RDP, or Telnet service without authenticating to the gateway; access to the destination still depends on that service's own controls.

CVSS severity8.8
High
EPSS probability2.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Authentication bypass in RoyalApps Royal TS before 5 allows remote attackers to access active Secure Gateway tunnels without credentials. Royal TS binds each temporary Secure Gateway forwarding port above 50000 to 0.0.0.0 instead of the loopback interface, exposing the authenticated tunnel to the local network. An attacker on that network can find an open port and reach an internal SSH, RDP, or Telnet service without authenticating to the gateway; access to the destination still depends on that service's own controls.

The record

CVE
CVE-2020-13872
Published
Jun 9, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-307, CAPEC-16, T1090.001
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

3.3NIST NVDAV:A/AC:L/Au:N/C:P/I:N/A:N
8.8NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
CAPEC-16Dictionary-based Password Attack
T1090.001Internal Proxy

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo