What is CVE-2016-5673?

CVE-2016-5673 is a high-severity vulnerability in Ultravnc Repeater, classified under Improper Access Control. CVSS score: 7.5/10. Published 2016-08-25.

How severe is CVE-2016-5673?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2016-5673 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Ultravnc Repeater

CVE-2016-5673

UltraVNC Repeater before 1300 does not restrict destination IP addresses or TCP ports, which allows remote attackers to obtain open-proxy functionality by using a :: substring in between the IP address and port number.

EPSS: 0.019 (77.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Ultravnc Repeater
N/a — versions n/a

Weakness classification (CWE)

CWE-284 — Improper Access Control

Public proof-of-concept exploits

0x3a/stargate

References

cret@cert.org (x_refsource_CONFIRM, US Government Resource, Third Party Advisory)
cret@cert.org (US Government Resource, x_refsource_CERT-VN, Third Party Advisory, third-party-advisory)
cret@cert.org (vdb-entry, x_refsource_BID)

Frequently asked questions

What is CVE-2016-5673?: CVE-2016-5673 is a high-severity vulnerability in Ultravnc Repeater, classified under Improper Access Control. CVSS score: 7.5/10. Published 2016-08-25.
How severe is CVE-2016-5673?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2016-5673 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.