Amcrest Cameras and NVR Stack-based Buffer Overflow Vulnerability
Amcrest · Cameras and Network Video Recorder (NVR)
The Amcrest cameras and Network Video Recorder (NVR) contain a stack-based buffer overflow in the service listening on port 37777. An authenticated remote attacker can exploit it over the network without user interaction to crash the device and possibly execute arbitrary code.
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.
- Exploited
- Yes, in CISA KEV
- Reports
- 0
- Tactics
- 3/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited 19 months after disclosure. Public exploit code (Exploit-DB) was available the same day.
CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
2 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order 2ExecutionTA0002
CVE-2020-5735 is a stack-based buffer overflow vulnerability in Amcrest cameras and NVR that allows an authenticated remote attacker to possibly execute unauthorized code over port 37777 and crash the device.
ImpactTA0040
Detection
0 rules for this CVE · 11 general rules for its techniquesRules for this CVE
0Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2020-5735 directly.CVE-specific rules are not available in this build. Search SigmaHQ ↗
General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Hijack Execution FlowT15748 general rules
- Exploiting SetupComplete.cmd CVE-2019-1378hightest
- Potential PrintNightmare Exploitation Attempthightest
- Suspicious Printer Driver Empty Manufacturerhightest
- DLL Execution Via Register-cimprovider.exemediumtest
- Potential Initial Access via DLL Search Order Hijackingmediumtest
- Potential Registry Persistence Attempt Via DbgManagedDebuggermediumtest
- Regsvr32 DLL Execution With Uncommon Extensionmediumtest
- Windows Spooler Service Suspicious Binary Loadinformationaltest
Endpoint Denial of ServiceT14993 general rules
- CVE-2024-49113 Exploitation Attempt - LDAP Nightmarehighexperimental
- LSASS Crash Via Netlogon Stack Buffer Overflow - CVE-2026-41089highexperimental
- Potential Abuse of Linux Magic System Request Keymediumexperimental
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
What security researchers reported
Not named in any threat report yetAlso mentioned in 50 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Actively_Exploited_Kev | Oct 29, 202628 Oct 2026
- Actively_Exploited_Kev | Oct 28, 202627 Oct 2026
- Actively_Exploited_Kev | Oct 27, 202626 Oct 2026
- Actively_Exploited_Kev | Oct 24, 202623 Oct 2026
- Actively_Exploited_Kev | Oct 23, 202622 Oct 2026
- Actively_Exploited_Kev | Oct 22, 202621 Oct 2026
- 44 more on OTX