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CVE-2025-66177

No known exploitation. EPSS puts it in the 26th percentile. A vendor fix is available.

CVSS 3.18.8High EPSS percentile26th0.4% chance in 30 days CISA KEVNot listedNo confirmed exploitation
No public exploit known FixVendor fixNo build named by the sources

Published 2026-01-13Updated 2026-07-09Sources: CVE.org, NVD, BDU

What to do

The vendor has published a fix. Version details are below where the sources state them.

Steps

Written by AI from the record

Identify which Hikvision model you run (from the list in this alert) and check your current firmware/software version in the device settings or admin interface.
Compare your version against Hikvision’s remediation guidance for “Buffer overflow vulnerabilities in some Hikvision products” and confirm whether your specific model/version is covered.
Update the affected Hikvision device(s) to the patched firmware recommended by Hikvision in that security advisory.
If you cannot patch immediately, restrict access to the device’s network services so only your trusted management hosts can reach it (reduce or remove LAN access from untrusted segments).

Some work to apply

Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

There is a Buffer overflow Vulnerability in the device Search and Discovery feature of Hikvision NVR/DVR/CVR/IPC models. If exploited, an attacker on the same local area network (LAN) could cause the device to malfunction by sending specially crafted packets to an unpatched device.

In plain language

Written by AI from the record

This is a Hikvision device software bug that could let a same-LAN attacker crash or disrupt affected devices by sending specially crafted network messages; small businesses should take it seriously, but it’s not known to be actively exploited in public right now.

CVE-2025-66177 is a buffer overflow in Hikvision NVR/DVR/CVR/IPC “Search and Discovery” functionality that can be triggered by specially crafted packets sent from the same local area network (LAN) to an unpatched device, potentially causing crashes or malfunction.

If you're affected

Device crashes or goes offline
Loss of video recording access
Operational disruption
Potential security camera outage

What is it

Hikvision network cameras/NVRs/DVRs include a “Search and Discovery” feature that helps devices/services find each other. This bug is like a “too-small bucket” in the software: if someone on the same local network sends carefully crafted messages, the device can behave incorrectly—commonly by crashing or going into a malfunctioning state. If that happens, your recording and viewing may be interrupted until the device is recovered.

Who is affected

This matters if you use one of these Hikvision device models and you have them connected to a network where other devices on the same LAN could send traffic to them. If the device is not updated, a local attacker on your LAN could trigger the problem using crafted packets.

This is primarily a risk when the vulnerable “Search and Discovery” functionality is reachable from the local network and an attacker can send network packets to the device (not something that typically requires an existing login).

How urgent is it

This should be treated as an important patching priority. Even though there’s no public exploit code on record and it’s not listed in CISA KEV, the vulnerability can still be triggered from the same LAN and may cause device malfunction, which can directly disrupt your operations. Plan remediation immediately, but it’s not at the “panic now” level based on current public exploitation information.

What to do — in detail

Confirm exposure (model + firmware):
- In each affected Hikvision device, record the exact model and current firmware/software version.
- Check whether each device falls into one of the affected models: ds-96xxxni-hx, ds-96xxxni-ix, ds-96xxnxi-sx, ds-96xxxnxi-sx, ds-76xxnxi-mx/vpro, ds-96xxnxi-mx/vpro, ds-76xxni-mx, ds-77xxni-mx, ds-96xxnxi-mx, ds-96xxxnxi-mx.
Determine whether a patch exists for your specific firmware branch:
- Use Hikvision’s official security advisory referenced here to find the corrected firmware versions and which models/versions are affected.
Apply the fix:
- Upgrade to the patched firmware version(s) specified by Hikvision for your exact model.
- Schedule downtime if needed (firmware upgrades can restart the device).
Temporary mitigation if patching is delayed:
- Reduce who can reach the device on your LAN: limit management/monitoring interfaces to trusted IPs/hosts.
- Segment the cameras/NVR/DVR network from guest Wi‑Fi or general employee networks so untrusted devices can’t reach it.
- Disable or restrict any unnecessary “discovery” or network services if your device configuration allows it (align with Hikvision guidance).
After updating:
- Verify the device is stable (no repeated crashes/reboots).
- Check logs for errors around network discovery/search activity and confirm remote access works as expected.
Follow-up monitoring:
- Monitor for abnormal device restarts, service interruptions, and unusual network traffic to the discovery-related functionality until you fully patch.

Note on exploitation status:

There is no public exploit code on record and this CVE is not listed in CISA KEV based on the provided findings; however, LAN-reachable bugs can still cause outages, so upgrading remains the right step.

Technical context

Severity/impact: Rated high (CVSS 8.8). The vulnerability is a buffer overflow (CWE-121) in the “Search and Discovery” feature of certain Hikvision NVR/DVR/CVR/IPC models.

Mechanism: A specially crafted packet sent to an unpatched device from the same local area network (LAN) can trigger the overflow, leading to device malfunction (e.g., crashes or loss of service).

Exploitation maturity: No public exploit code was found in the provided findings, and the vulnerability is not present in CISA KEV. Because the LAN attack precondition is relatively straightforward (local network reachability), affected environments are still considered at meaningful risk for operational disruption.

EPSS: A predicted likelihood value is available in the findings, but it is not used here for public-facing urgency because the provided information indicates no KEV/news confirmation of active exploitation.

KEV meaning: KEV is a list of vulnerabilities CISA has confidence about for active exploitation; since this CVE is not listed there, public exploitation is not confirmed by CISA in the provided findings.

This is a general assessment based on public vulnerability data. It does not account for your specific infrastructure — when in doubt, consult a security specialist.

Sign in for the full breakdown

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS26th

CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.4% chance of exploitation activity in the next 30 days, which ranks it in the 26th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

7 events over 177 days, from the signal feeds we watch.

2026-07-09Patch availablerecord updated
2026-01-13Patch availablepublished, weakness classified, att&ck mapped, record updated

Affected products

And 181 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Scored 8.8 by NVD.

How it is reached

Attack Vector AdjacentRequires access to the local network (e.g. same Wi-Fi, Bluetooth)
Attack Complexity LowNo special conditions — the attack can be reliably reproduced
Privileges Required NoneNo authentication required — anyone can exploit this
User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

Confidentiality HighTotal information disclosure — all data in the component is compromised
Integrity HighTotal loss of integrity — attacker can modify any data in the component
Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

CWE-121No name in the record

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Privilege EscalationT1068Exploitation for Privilege Escalationhigh confidence

Sources

References in the record

hikvision.com/en/support/cybersecurity/security-advisory/buffer-overflow-vulnerabilities-in-some-hikvision-products/

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