GreyNoise Detects Active Exploitation Attempts of CVE-2021-36260 Against Hikvision Cameras

GreyNoise recorded exploitation attempts targeting CVE-2021-36260 in Hikvision cameras and recorders between September 21 and October 1. The vulnerability carries a CVSS score of 9.8 and allows unauthenticated remote command execution through insufficient input validation in the embedded web server. Attack traffic originated from four IP addresses, three routed through a commercial VPN in Lithuania and one from a Ukrainian residential network, with all targets located in Ukraine. Attackers leveraged a publicly available Nuclei template to probe devices, though GreyNoise confirmed only scanning activity and not successful compromises. The five-year-old flaw remains actively scanned despite an available firmware patch from Hikvision and a CISA advisory recommending immediate updates. Password changes provide no protection because the attack requires no authentication. Defenders are advised to apply firmware updates, remove devices from public internet exposure, and segment video surveillance networks from critical infrastructure.

BoletimSecOctober 9, 2026Translated from Portuguese

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GreyNoise has detected active exploitation attempts against Hikvision cameras and video recorders using the critical vulnerability CVE-2021-36260. The scanning activity occurred between 21 September and 1 October, with all observed targets located in Ukraine.

The flaw scores 9.8 on the CVSS scale and enables unauthenticated remote code execution. It stems from insufficient input validation in the embedded web server, allowing specially crafted requests to inject and execute operating-system commands directly on the device.

Exploitation requires only network reachability to the web interface; no credentials or user interaction are needed. Four source IP addresses were observed: three originated from a commercial VPN exit in Lithuania and one came from a residential network in Ukraine. Attackers used a publicly available Nuclei template specifically written for this vulnerability.

GreyNoise documented reconnaissance and testing activity but has not confirmed any successful device takeovers. The vulnerability was disclosed in 2021, yet scanning continues five years later with ready-to-use public tools.

Hikvision has released firmware updates that address the issue. CISA recommends immediate application of the patches. Changing device passwords offers no mitigation because the attack bypasses authentication entirely.

Recommended defensive measures include applying the latest firmware, removing cameras from direct internet exposure, and isolating video-surveillance networks from critical business segments.

CISA nuclei GreyNoise CVE-2021-36260 Hikvision

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