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PatchSiren cyber security CVE debrief

CVE-2020-5735 Amcrest CVE debrief

CVE-2020-5735 is a stack-based buffer overflow affecting Amcrest Cameras and Network Video Recorder (NVR) devices. CISA added it to the Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03, which means it is treated as a known-exploited issue and should be prioritized for remediation according to vendor instructions.

Vendor
Amcrest
Product
Cameras and Network Video Recorder (NVR)
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Organizations that operate Amcrest cameras or Amcrest NVR devices, especially teams responsible for patch management, security operations, physical security infrastructure, and any environment that treats video surveillance systems as operationally important.

Technical summary

The supplied record identifies the issue as a stack-based buffer overflow in Amcrest Cameras and NVR products. The CISA KEV listing indicates known exploitation and directs affected users to apply updates per the vendor's instructions. No CVSS score was provided in the supplied record.

Defensive priority

High. A KEV listing indicates this vulnerability is considered actively important for defense and should be prioritized ahead of non-KEV issues, using the vendor-directed update path referenced by CISA.

Recommended defensive actions

  • Identify any Amcrest Cameras and NVR assets in your environment.
  • Check whether the affected devices are running vendor-fixed firmware or software versions.
  • Apply updates per vendor instructions as referenced by CISA.
  • If patching cannot be completed immediately, isolate exposed devices and limit network access to management interfaces.
  • Verify remediation by confirming device versions and documenting completion for vulnerability tracking.

Evidence notes

Source corpus supports the product/vendor pairing, the vulnerability type, and KEV status. Timeline fields show CISA added the entry on 2021-11-03 with a due date of 2022-05-03. The supplied record does not include a CVSS score or additional exploitation details beyond KEV status.

Official resources

Publicly recorded in the CVE and CISA KEV sources provided here; the KEV entry is dated 2021-11-03. This debrief avoids exploit details and is limited to defensive context from the supplied corpus.