CVE-2026-61391: Hikvision Camera Buffer Overflow Flaw

CVE-2026-61391 Overview

CVE-2026-61391 is a stack-based buffer overflow vulnerability affecting some Hikvision cameras. Authenticated attackers can send specially crafted packets over the network to trigger the overflow and cause device malfunction. The flaw is classified under [CWE-121] Stack-based Buffer Overflow and impacts the confidentiality, integrity, and availability of affected devices.

Hikvision published a security advisory describing the issue and providing remediation guidance for affected camera models. Because the vulnerability requires authentication, attackers must first obtain valid credentials, whether through credential reuse, brute force against weak passwords, or lateral movement from a compromised host on the same network.

Critical Impact
An authenticated network attacker can crash affected Hikvision cameras or potentially execute code by sending malformed packets, disrupting video surveillance operations.

Affected Products

Hikvision network cameras (specific models listed in the vendor advisory)
Firmware versions identified by Hikvision as vulnerable
Deployments exposing camera management interfaces to reachable networks

Discovery Timeline

2026-07-22 - CVE-2026-61391 published to NVD
2026-07-22 - Last updated in NVD database

Technical Details for CVE-2026-61391

Vulnerability Analysis

The vulnerability is a stack-based buffer overflow [CWE-121] in packet-handling logic on affected Hikvision cameras. When an authenticated attacker submits a specially crafted packet, the device copies attacker-controlled input into a fixed-size stack buffer without adequate bounds checking. The oversized write corrupts adjacent stack memory, including saved return addresses and local variables.

The immediate consequence is device malfunction, such as a crash of the affected service or a full device reboot. Depending on stack layout, memory protections, and the shape of the overflow, an attacker with detailed knowledge of the firmware may also be able to redirect execution and run arbitrary code on the camera.

Exploitation requires network reachability to the camera and high-privilege authentication. Once compromised, a camera can be leveraged as a foothold on internal networks, a source of manipulated video feeds, or a node in a botnet targeting other infrastructure.

Root Cause

The root cause is missing or insufficient input length validation in a packet parser running on the camera. The parser trusts a length field or terminator provided by the client and calls an unsafe copy operation into a stack buffer, allowing the write to exceed the buffer boundary.

Attack Vector

The attack vector is network-based. An attacker authenticated to the camera sends a crafted packet to a listening service, and the malformed input triggers the overflow inside the packet-processing routine. Successful exploitation results in denial of service and, in the worst case, code execution in the context of the vulnerable process.

Refer to the Hikvision Security Advisory for vendor-supplied technical details.

Detection Methods for CVE-2026-61391

Indicators of Compromise

Unexpected reboots, service crashes, or watchdog resets on Hikvision cameras
Authentication events from unusual source IP addresses or at atypical times
Malformed or oversized packets directed at camera management ports in network captures
Loss of video stream or repeated reconnection attempts from client software

Detection Strategies

Monitor camera device logs for repeated abnormal terminations of packet-handling services
Baseline normal traffic to camera management interfaces and alert on protocol anomalies or oversize payloads
Correlate successful authentications to cameras with subsequent device availability failures
Track firmware versions across the camera fleet and flag devices running vulnerable releases

Monitoring Recommendations

Ingest camera and NVR syslog into a centralized SIEM for cross-device correlation
Enable network flow logging on VLANs hosting IP cameras to detect scanning and abnormal sessions
Alert on new administrative logins to cameras from hosts outside the surveillance management subnet

How to Mitigate CVE-2026-61391

Immediate Actions Required

Identify all Hikvision cameras in the environment and compare firmware versions against the vendor advisory
Apply the firmware updates published by Hikvision to affected models as soon as feasible
Rotate administrative credentials on all cameras and enforce strong, unique passwords
Restrict management access to cameras to a dedicated, segmented VLAN reachable only from authorized workstations

Patch Information

Hikvision has published remediation guidance in the Hikvision Security Advisory. Administrators should consult the advisory for the list of affected models and the corresponding fixed firmware versions, then plan a staged rollout across the fleet.

Workarounds

Block inbound access to camera management ports from untrusted networks at the perimeter firewall
Place cameras behind a hardened NVR or reverse proxy rather than exposing them directly
Disable unused services and protocols on the camera to reduce attack surface
Enforce network access control to prevent unauthorized hosts from reaching camera VLANs

bash

# Example: restrict access to Hikvision cameras to a management subnet only
iptables -A FORWARD -s 10.10.20.0/24 -d 10.50.0.0/16 -p tcp --dport 8000 -j ACCEPT
iptables -A FORWARD -d 10.50.0.0/16 -p tcp --dport 8000 -j DROP
iptables -A FORWARD -d 10.50.0.0/16 -p tcp --dport 80 -j DROP
iptables -A FORWARD -d 10.50.0.0/16 -p tcp --dport 554 -j DROP