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Exploited vulnerability · CISA KEV

Is CVE-2020-5735 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Amcrest Cameras and Network Video Recorder (NVR) · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-5735, Amcrest Cameras and NVR Stack-based Buffer Overflow Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 574 days after it was published. It affects Amcrest Cameras and Network Video Recorder (NVR). If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity8.8CVSS 3.1 · high
US federal due3 May 2022BOD 22-01 deadline

What it is

Amcrest cameras and NVR contain a stack-based buffer overflow vulnerability through port 37777 that allows an unauthenticated, remote attacker to crash the device and possibly execute code.

VendorAmcrest (1 exploited CVE in KEV)
ProductCameras and Network Video Recorder (NVR)
VulnerabilityAmcrest Cameras and NVR Stack-based Buffer Overflow Vulnerability
WeaknessCWE-121
Published8 Apr 2020
Added to KEV3 Nov 2021
Reported by (CNA)tenable

What to do

  1. Check whether you run it. Look for Cameras and Network Video Recorder (NVR) in your asset inventory, including appliances and cloud images. Stack check lists every exploited Amcrest CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 8 Apr 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for Amcrest.

References

Questions

Is CVE-2020-5735 being exploited?

Yes. CISA added CVE-2020-5735 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-5735 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2020-5735?

Apply updates per vendor instructions. Check Amcrest's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Cameras and Network Video Recorder (NVR) and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2021 · act-now radar.

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