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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.

Sources and references

Verified primary and authoritative sources

  • CVE-2020-5735 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2020-5735

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2020-5735 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2020-5735

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.