CVE-2025-51457

Executive Summary

CVE-2025-51457 is an authenticated command injection vulnerability in the web management interface of the D-Link DAP-2610 wireless access point, affecting firmware versions up to and including 2.06B08r099. An attacker who holds valid administrative credentials can supply crafted input through certain parameters at the /index.xgi endpoint, causing the underlying operating system to execute arbitrary commands. Successful exploitation grants operating-system-level command execution on the device, enabling full compromise of the access point and a potential pivot point into the network segment it serves.

Technical Analysis

The vulnerability resides in the DAP-2610 web management interface, specifically at the /index.xgi endpoint. The NVD description states that an authenticated user can exploit "some parameters" at this endpoint to execute arbitrary system commands. The device exposes this web interface for administrative configuration, and the flaw is a classic command injection (CWE-78): user-supplied input reaching a shell or system call is not properly sanitized, allowing injected command separators or shell metacharacters to be interpreted as part of an operating-system command.

Several structural facts follow directly from the description:

• Attack vector: Network-accessible web interface (/index.xgi), consistent with a remote vector.
• Authentication requirement: The attacker must already possess authenticated access. This is explicitly stated, which distinguishes the flaw from a pre-authentication remote code execution bug. The practical consequence is a privilege-escalation-from-admin-web-session to OS-level command execution — the web account itself is not intended to yield shell access.
• Affected product/version: D-Link DAP-2610 up to firmware 2.06B08r099.
• Endpoint: /index.xgi — the CGI-style handler identified as the injection surface.

Because the NVD description does not name the specific vulnerable parameter(s) or the exact system call involved, the precise injection point cannot be stated with certainty. Analysts should treat the endpoint and the authenticated requirement as the confirmed facts and refrain from assuming specific parameter names or executable paths that are not documented. The vulnerability class — command injection via unsanitized web-interface parameters — is well understood and follows a predictable exploitation pattern once the vulnerable parameter is identified.

Environmental note: the DAP-2610 is an end-of-life-class 802.11ac access point. Devices of this type are frequently deployed at network edges, in branch offices, and in guest-Wi-Fi segments, meaning a compromise can expose an external-facing or semi-trusted network position.

Exploitation Scenarios

No public proof-of-concept, exploit code, or Nuclei template is available for this CVE as of the data provided. The attack chain below is inferred from the vulnerability class (authenticated command injection via a web endpoint) and the facts explicitly stated in the description. Specific parameter names and payload strings are not documented and are therefore not asserted here.

1. Reconnaissance and target identification. The attacker identifies reachable D-Link DAP-2610 management interfaces. This is typically done by scanning for the web management port and fingerprinting the login page / device banner. Shodan-style enumeration using the identified dorks narrows candidates. The attacker also needs a valid administrative credential set — obtained through prior credential theft, default/weak credentials, credential reuse, a separate auth-bypass condition, or legitimate-but-malicious insider access.

2. Authentication. The attacker authenticates to the web management interface. Per the description, authentication is a precondition: exploitation is not possible without it. This means the attacker operates in the post-authentication context.

3. Triggering the injection. Through the /index.xgi endpoint, the attacker submits crafted input to the affected parameters. Because input from these parameters is passed to a system-level command without adequate sanitization, shell metacharacters embedded in the input cause the device's shell to interpret and execute additional, attacker-controlled commands. At the vulnerability-class level, this is the standard authenticated command-injection trigger: a web request carrying an injected command payload in a parameter consumed by a system call. The specific parameter and payload syntax are not publicly documented for this CVE.

4. Execution and post-exploitation impact. On success, arbitrary OS commands run with the privileges of the web service (on embedded firmware, often root or a highly privileged account). The attacker can then read or modify configuration, exfiltrate stored credentials (e.g., Wi-Fi PSKs, admin hashes), alter network configuration, install persistence, or use the device as a pivot to reach internal segments. Because the device is a wireless access point, control of it can also facilitate traffic interception or redirection for connected clients.

Because the flaw requires authentication, the realistic initial-access model is one where the attacker already has a foothold (stolen admin credentials or an internal position) and this CVE converts that foothold into full device/OS compromise.

Impact Assessment

No CVSS score is assigned in the source data (score N/A; the vector provided in metadata is a structural estimate, not an official vendor or NVD assessment, and should be treated as provisional). Qualitatively:

• Confidentiality: High. OS-level command execution allows reading arbitrary files, including configuration and credential material.
• Integrity: High. The attacker can modify firmware configuration, network settings, and potentially deploy persistent changes.
• Availability: High. Commands can disable services, alter routing/bridging, or brick the device.
• Scope: Unchanged (per the modeled vector). Impact is contained to the device and the network it serves at the OS level, though real-world lateral movement is a plausible downstream consequence.
• Privileges Required: Low (authenticated web user). The attacker needs credentials but no pre-existing OS access.
• User Interaction: None.

Business impact. Compromise of an access point can undermine the confidentiality of wireless traffic, enable rogue network positioning, and provide a stable internal foothold for lateral movement. Because the DAP-2610 is often deployed in branch and edge locations with limited monitoring, a compromised device may remain undetected. The blast radius is the access point itself plus any network segment and clients it serves; downstream impact depends heavily on network segmentation and the value of resources reachable from that segment.

Detection Guidance

Sigma Rule

title: Potential D-Link DAP-2610 Authenticated Command Injection (CVE-2025-51457)
id: 8f3c1a2e-5145-4b7d-9c01-0a1b2c3d4e5f
status: experimental
description: Detects POST requests to the DAP-2610 /index.xgi management endpoint containing shell metacharacters, consistent with CVE-2025-51457 command injection.
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2025-51457
author: valtersit.com
date: 2025-01-01
tags:
  - attack.t1190
  - attack.t1059.004
logsource:
  category: webserver
  product: dlink
detection:
  selection_endpoint:
    cs-uri-stem|contains: '/index.xgi'
  selection_method:
    cs-method: 'POST'
  selection_payload:
    cs-uri-query|contains:
      - ';'
      - '|'
      - '`'
      - '$('
      - '&&'
      - '>/'
  condition: selection_endpoint and selection_method and selection_payload
falsepositives:
  - Legitimate administrative configuration that includes shell-like characters (rare on this endpoint).
level: high

YARA Rule

rule CVE_2025_51457_DLink_DAP2610_CmdInjection
{
    meta:
        description = "Detects references to the D-Link DAP-2610 /index.xgi authenticated command injection surface (CVE-2025-51457)"
        author = "valtersit.com"
        date = "2025-01-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2025-51457"
        cve = "CVE-2025-51457"

    strings:
        $endpoint = "/index.xgi" ascii wide nocase
        $dev      = "DAP-2610" ascii wide nocase
        $fw       = "2.06B08" ascii wide nocase

    condition:
        uint32(0) != 0x89504E47 and
        (
            ($endpoint and $dev) or
            ($dev and $fw)
        )
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2025-51457 D-Link DAP-2610 Authenticated Command Injection attempt (/index.xgi)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/index.xgi"; nocase; pcre:"/([;\x60]|\$\(|\|\||&&)/U"; reference:cve,CVE-2025-51457; classtype:web-application-attack; sid:202551457; rev:1;)

Elastic Detection

process where event.type in ("start","creation") and
  process.parent.name in ("httpd","lighttpd","boa","uhttpd","mini_httpd","goahead") and
  process.name in ("sh","bash","busybox","ash","telnetd","wget","curl","tftp")

Splunk SPL Query

index=web OR index=proxy sourcetype=*access*
| search uri_path="/index.xgi" method=POST
| eval suspicious=if(match(uri_query, "(;|\||`|\$\(|&&|%3b|%7c|%60)"), 1, 0)
| where suspicious=1
| stats count min(_time) as first_seen max(_time) as last_seen values(src) as sources values(uri_query) as payloads by dest, uri_path, method
| sort - count

Wazuh OSSEC Rule

<group name="web,dlink,cve-2025-51457,">
  <rule id="2025514" level="12">
    <decoded_as>web-accesslog</decoded_as>
    <field name="url">/index\.xgi</field>
    <regex type="pcre2">(?:;|\||`|\$\(|&&|%3b|%7c|%60)</regex>
    <description>CVE-2025-51457: Potential D-Link DAP-2610 command injection attempt against /index.xgi</description>
    <mitre>
      <id>T1190</id>
      <id>T1059.004</id>
    </mitre>
    <group>web_attack,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source). No vendor fix, workaround, or fixed firmware version has been identified by tracked sources as of this report. The following are defensive recommendations consistent with the vulnerability class; none is a confirmed vendor fix.

1. Immediate mitigations

• Remove or restrict network exposure of the DAP-2610 web management interface. Place management access on a dedicated, isolated VLAN and block internet and untrusted-segment reachability to the management port.
• Enforce strong, unique administrative credentials and rotate them; eliminate default and shared credentials. Because exploitation requires authentication, credential hygiene directly reduces risk.
• Restrict management access with firewall ACLs to a small set of trusted administrative hosts.
• Where the device is end-of-life and cannot be adequately protected, consider replacement with a supported product.

2. Patch / upgrade steps

• No fixed firmware version is documented. Monitor the D-Link security advisory page for the DAP-2610 for a firmware release that addresses command injection at /index.xgi.
• If and when a fixed firmware is published, back up the configuration, apply the firmware, and verify the version. Do not assume any specific build number is fixed until the vendor confirms it.

3. Long-term hardening

• Maintain a hardware/software asset inventory that flags end-of-life and unsupported network devices.
• Apply network segmentation so that compromise of an access point does not grant broad lateral movement.
• Centralize and retain web-management and device logs for detection (see Detection Guidance).
• Enforce least privilege for administrative web accounts; audit who holds them.
• Adopt an inventory-driven patch process and subscribe to vendor advisories and CVE feeds for network infrastructure.

References

• NVD — CVE-2025-51457: https://nvd.nist.gov/vuln/detail/CVE-2025-51457
• D-Link product/security resource for the DAP-2610: https://www.dlink.com/
• MITRE ATT&CK T1190 — Exploit Public-Facing Application: https://attack.mitre.org/techniques/T1190/
• MITRE CWE-78 — Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'): https://cwe.mitre.org/data/definitions/78.html
• CISA Known Exploited Vulnerabilities Catalog (check for future addition): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

No exploit-in-the-wild evidence, threat actor campaign, or public proof-of-concept was identified in the provided data for CVE-2025-51457.