Security readout for executives and security teams
Plain-English summary
Certain Hikvision access control terminals can be disrupted or worse by a nearby network attacker. The issue is in device Search and Discovery handling, so exposure is mainly on the same LAN, not necessarily the internet. Successful exploitation could affect confidentiality, integrity, and availability according to the CVSS vector.
Executive priority
Treat as a high-priority OT/physical-security maintenance issue. The attack requires local network adjacency, but compromised or disrupted access control devices can create business continuity and facility security risk.
Technical view
CVE-2025-66176 is a CWE-121 buffer overflow in Hikvision Access Control Products' Search and Discovery feature. The CVSS 3.1 score is 8.8 with adjacent-network attack vector, low complexity, no privileges, and no user interaction. Affected versions vary by model and are below the firmware versions listed in the advisory.
Likely exposure
Organizations using listed Hikvision DS-K1T and DS-K5033 access control models on shared or poorly segmented LANs are most exposed, especially where device discovery traffic is reachable by untrusted users or guest networks.
Exploitation context
The source bundle says LAN-adjacent attackers could send specially crafted packets to unpatched devices. KEV is false, and the provided sources do not establish active exploitation in the wild.
Researcher notes
Focus validation on LAN reachability, exact model and firmware mapping, and discovery-service exposure. The public bundle supports impact and affected-version assessment, but does not provide enough evidence to claim exploitation activity or broader product impact.
Mitigation direction
- Inventory Hikvision access control devices and map each model to its firmware version.
- Upgrade affected devices to the fixed version threshold or newer listed by Hikvision.
- Segment access control devices from guest, user, and unmanaged networks.
- Restrict device discovery traffic to trusted management networks where operationally possible.
- Monitor vendor advisories for model-specific firmware and operational guidance.
Validation and detection
- Confirm whether deployed models match the affected product list.
- Compare installed firmware against the vulnerable version thresholds in the advisory.
- Verify access control devices are reachable only from trusted management segments.
- Review network logs for unusual discovery traffic targeting these devices.
- Retest after firmware updates to confirm version and segmentation changes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-121: Exact CWE lookup
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Open ATT&CK lookupCVE-2025-66176 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.85.9hikvisionVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.