CVE-2026-43233

A flaw was found in the Linux kernel's nfconntrackh323 helper. A remote attacker could exploit this by sending a specially crafted Q.931 SETUP message to port 1720 through a firewall with the nfconntrackh323 helper active. This memory corruption vulnerability leads to an out-of-bounds read, which...

PT-2026-37573

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf conntrack h323: fix OOB read in decode choice In decode choice, the boundary check before get len uses the variable len, which is still 0 from its initialization at the top of the function: unsigned int type, ext, l...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-001560)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-001560 advisory. An out-of-bounds memory write flaw was found in how the Linux kernels Voice Over IP H.323 connection tracking functionality handled connections on ipv6 port 1720. Th...

Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-003996)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-003996 advisory. An out-of-bounds memory write flaw was found in how the Linux kernels Voice Over IP H.323 connection tracking functionality handled connections on ipv6 port 1720. Th...

EUVD-2020-6457

Malware in sbrugna...

Linux Distros Unpatched Vulnerability : CVE-2020-14305

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - An out-of-bounds memory write flaw was found in how the Linux kernel's Voice Over IP H.323 connection tracking functionality handled connections on ipv6 port...

CVE-2011-3277

Unspecified vulnerability in the NAT implementation in Cisco IOS 12.1 through 12.4 and 15.0 through 15.1, and IOS XE 3.1.xSG, allows remote attackers to cause a denial of service device reload by sending crafted H.323 packets to TCP port 1720, aka Bug ID CSCth11006...

Denial Of Service (DoS)

kernel-rt is vulnerable to denial of service. The vulnerability exists because of an incorrect way of handling connection tracking functionality on ipv6 port 1720, allowing an attacker to cause an application crash through the out-of-bounds memory write...

kernel: memory corruption in Voice over IP nf_conntrack_h323 module

An out-of-bounds memory write flaw was found in how the Linux kernel’s Voice Over IP H.323 connection tracking functionality handled connections on ipv6 port 1720. This flaw allows an unauthenticated remote user to crash the system, causing a denial of service. The highest threat from this...

CVE-2020-14305

An out-of-bounds memory write flaw was found in how the Linux kernel’s Voice Over IP H.323 connection tracking functionality handled connections on ipv6 port 1720. This flaw allows an unauthenticated remote user to crash the system, causing a denial of service. The highest threat from this...

PT-2017-1003 · Linux +4 · Linux Kernel +4

Name of the Vulnerable Software and Affected Versions: Linux kernel affected versions not specified Description: The issue is related to an out-of-bounds memory write flaw in the Linux kernel's Voice Over IP H.323 connection tracking functionality when handling connections on ipv6 port 1720. This...

innovaphone IP222 / IP232 Denial Of Service

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Advisory ID: SYSS-2015-053 Product: innovaphone IP222/IP232 Manufacturer: innovaphone AG Affected Versions: 11r1s r2 Tested Versions: 11r1s r2 Vulnerability Type: Denial of Service CWE-730 Risk Level: Medium Solution Status: Fixed Manufacturer...

Microsoft NetMeeting 3.0.1 4.4.3385 Remote Desktop Sharing DoS Vulnerability

No description provided by source. source: http://www.securityfocus.com/bid/1798/info The Remote Desktop Sharing component of Microsoft NetMeeting for Windows NT 4.0 / 2000 does not properly handle a particular type of malformed input string sent over port 1720. CPU utilization can be caused to...

CVE-2011-3277

Unspecified vulnerability in the NAT implementation in Cisco IOS 12.1 through 12.4 and 15.0 through 15.1, and IOS XE 3.1.xSG, allows remote attackers to cause a denial of service device reload by sending crafted H.323 packets to TCP port 1720, aka Bug ID CSCth11006...

Design/Logic Flaw

Unspecified vulnerability in the NAT implementation in Cisco IOS 12.1 through 12.4 and 15.0 through 15.1, and IOS XE 3.1.xSG, allows remote attackers to cause a denial of service device reload by sending crafted H.323 packets to TCP port 1720, aka Bug ID CSCth11006...

CVE-2011-3277

Unspecified vulnerability in the NAT implementation in Cisco IOS 12.1 through 12.4 and 15.0 through 15.1, and IOS XE 3.1.xSG, allows remote attackers to cause a denial of service device reload by sending crafted H.323 packets to TCP port 1720, aka Bug ID CSCth11006...

CVE-2011-3277

CVE-2011-3277 affects Cisco IOS NAT implementation (12.1–12.4, 15.0–15.1) and IOS-XE 3.1.xSG. The issue arises from NAT handling of H.323 traffic on TCP/1720, enabling remote attackers to cause a DoS (device reload). Cisco’s advisory notes multiple NAT DoS vectors (including H.323), with mitigati...

Microsoft NetMeeting 3.0.1 4.4.3385 - Remote Desktop Sharing Denial of Service

source: https://www.securityfocus.com/bid/1798/info The Remote Desktop Sharing component of Microsoft NetMeeting for Windows NT 4.0 / 2000 does not properly handle a particular type of malformed input string sent over port 1720. CPU utilization can be caused to spike to 100% and any existing...