CVE-2021-36260
CRITICALA command injection vulnerability in the web server of some Hikvision product. Due to the insufficient input validation, attacker can exploit the vulnerability to launch a command injection…
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Description
A command injection vulnerability in the web server of some Hikvision product. Due to the insufficient input validation, attacker can exploit the vulnerability to launch a command injection attack by sending some messages with malicious commands.
Affected Products
ds-2cd2021g1-i\(w\) firmwarehikvisionds-2cd2023g2-i\(u\) firmwarehikvisionds-2cd2026g2-iu\/sl firmwarehikvisionds-2cd2027g2-l\(u\) firmwarehikvisionds-2cd2027g2-lu\/sl firmwarehikvisionds-2cd2043g2-i\(u\) firmwarehikvisionResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Hikvision Web Server Build 210702 - Command Injection
by bashis · Oct 25, 2021
Detection & mitigation playbook
Vendor / applianceDetect
Inventory every hikvision ds-2cd2021g1-i\(w\) firmware deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for remote code execution at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.
Remediation status
No patch has shipped for CVE-2021-36260 yet — track the hikvision ds-2cd2021g1-i\(w\) firmware advisory for a fixed release and apply the workarounds below in the meantime.
Mitigate without a patch
Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.
How O3 protects you
O3 detects and blocks CVE-2021-36260 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.
Tailored to CVE-2021-36260. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2021-36260 being exploited in your environment?
O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2021-36260 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.