Citrix NetScaler ADC and Gateway Devices Under Attack: CISA Urges Immediate Action

The U.S. Cybersecurity and Infrastructure Security Agency CISA issued an advisory on Thursday warning that the newly disclosed critical security flaw in Citrix NetScaler Application Delivery Controller ADC and Gateway devices is being abused to drop web shells on vulnerable systems. "In June 2023...

CVE-2023-33011

A format string vulnerability in the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50W series firmware versions 5.10 through 5.36 Patch 2, USG20W-VPN series firmware versions 5.10 through 5.36 Patch 2, and VPN...

CVE-2023-34138

A command injection vulnerability in the hotspot management feature of the Zyxel ATP series firmware versions 4.60 through 5.36 Patch 2, USG FLEX series firmware versions 4.60 through 5.36 Patch 2, USG FLEX 50W series firmware versions 4.60 through 5.36 Patch 2, USG20W-VPN series firmware version...

CVE-2023-34139

A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affecte...

CVE-2023-34140

A buffer overflow vulnerability in the Zyxel ATP series firmware versions 4.32 through 5.36 Patch 2, USG FLEX series firmware versions 4.50 through 5.36 Patch 2, USG FLEX 50W series firmware versions 4.16 through 5.36 Patch 2, USG20W-VPN series firmware versions 4.16 through 5.36 Patch 2, VPN...

Format string

A format string vulnerability in the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50W series firmware versions 5.10 through 5.36 Patch 2, USG20W-VPN series firmware versions 5.10 through 5.36 Patch 2, and VPN...

Command injection

A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affecte...

Buffer overflow

A buffer overflow vulnerability in the Zyxel ATP series firmware versions 4.32 through 5.36 Patch 2, USG FLEX series firmware versions 4.50 through 5.36 Patch 2, USG FLEX 50W series firmware versions 4.16 through 5.36 Patch 2, USG20W-VPN series firmware versions 4.16 through 5.36 Patch 2, VPN...

Command injection

A command injection vulnerability in the access point AP management feature of the Zyxel ATP series firmware versions 5.00 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50W series firmware versions 5.00 through 5.36 Patch 2, USG20W-VPN series firmware...

Command injection

A command injection vulnerability in the configuration parser of the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50W series firmware versions 5.10 through 5.36 Patch 2, USG20W-VPN series firmware versions 5.10...

CVE-2023-34141

CVE-2023-34141 affects Zyxel devices (ATP series, USG FLEX series including USG FLEX 50(W), USG20(W)-VPN, VPN series; NXC2500 and NXC5500) with firmware ranges up to 5.36 Patch 2 or 6.10 AAIG/AAOS variants. Description: a command-injection in the access point (AP) management feature could allow a...

CVE-2023-34141

A command injection vulnerability in the access point AP management feature of the Zyxel ATP series firmware versions 5.00 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50W series firmware versions 5.00 through 5.36 Patch 2, USG20W-VPN series firmware...

CVE-2023-34140

CVE-2023-34140 affects Zyxel CAPWAP-based devices (ATP series 4.32–5.36 Patch 2; USG FLEX 4.50–5.36 Patch 2; USG FLEX 50(W) 4.16–5.36 Patch 2; USG20(W)-VPN 4.16–5.36 Patch 2; VPN 4.30–5.36 Patch 2; NXC2500 6.10(AAIG.0–AAIG.3); NXC5500 6.10(AAOS.0–AAOS.4)). A buffer overflow in the CAPWAP daemon a...

CVE-2023-34139

Summary: CVE-2023-34139 is a command injection in Zyxel USG FLEX and VPN series related to the Free Time WiFi hotspot feature. An unauthenticated, LAN-based attacker could execute OS commands on affected devices. Affected products/versions: USG FLEX firmware 4.50–5.36 Patch 2; VPN series firmware...

CVE-2023-34139

A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affecte...

CVE-2023-33012

A command injection vulnerability in the configuration parser of the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50W series firmware versions 5.10 through 5.36 Patch 2, USG20W-VPN series firmware versions 5.10...

CVE-2023-33012

CVE-2023-33012 is a command-injection vulnerability in the configuration parser of Zyxel devices (ATP, USG FLEX/50(W), USG20(W)-VPN, VPN series). The root cause is a flaw in parsing GRE configurations when cloud management mode is enabled, allowing an unauthenticated, LAN-based attacker to execut...

CVE-2023-33011

A format string vulnerability in the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50W series firmware versions 5.10 through 5.36 Patch 2, USG20W-VPN series firmware versions 5.10 through 5.36 Patch 2, and VPN...

Citrix Secure Access for Windows fails to allow traffic through VPN after an upgrade to 23.x.x.x

After a successful connection to the Citrix Secure Access CSA client in full tunnel, none of the traffic passes through the VPN. Access to the applications using an IP address or DNS over the tunnel is blocked. The issue is limited to domain-joined machines where the Intranet IP address is...

CVE-2023-34138: Improper Neutralization of Special Elements used in an OS Command

A command injection vulnerability in the hotspot management feature of the Zyxel ATP series firmware versions 4.60 through 5.36 Patch 2, USG FLEX series firmware versions 4.60 through 5.36 Patch 2, USG FLEX 50W series firmware versions 4.60 through 5.36 Patch 2, USG20W-VPN series firmware version...