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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.87%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 1.87% probability · 79th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-284
- Affected
- ultravnc/repeater
- Source
- cret@cert.org
EPSS 1.9% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.kb.cert.org/vuls/id/735416Third Party Advisory, US Government Resource
- http://www.kb.cert.org/vuls/id/BLUU-A9WQVPThird Party Advisory, US Government Resource
- http://www.securityfocus.com/bid/92348
- http://www.kb.cert.org/vuls/id/735416Third Party Advisory, US Government Resource
- http://www.kb.cert.org/vuls/id/BLUU-A9WQVPThird Party Advisory, US Government Resource
- http://www.securityfocus.com/bid/92348
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.