CVE-2026-76711

Executive Summary

CVE-2026-76711 is an unauthenticated remote input-validation vulnerability (CWE-20) in the Aruba Networks Analytics and Location Engine (ALE), a component that ingests and processes socket connections from location-aware network infrastructure. The impacted process fails to properly validate or process incoming socket connection data, allowing a network-positioned attacker to supply specially crafted input during connection establishment. Successful exploitation results in unauthorized data injection (CVSS 3.1 base 7.5, integrity-only impact), which can corrupt or poison analytics, location, and telemetry data consumed by downstream systems.

Technical Analysis

The vulnerability resides in an Analytics and Location Engine component that "improperly processes incoming socket connections." The NVD description frames the root cause as improper handling of attacker-controlled input during the socket connection process, mapped to CWE-20 (Improper Input Validation). No specific function names, class names, socket handlers, API paths, message schemas, or parameter names are disclosed in the available CNA/NVD text; this report deliberately does not fabricate them.

What can be stated with confidence from the vulnerability class and CVSS vector:

• Attack surface: A network-reachable socket listener exposed by the ALE component. Because the CVSS vector is AV:N/AC:L/PR:N/UI:N, the service is reachable over the network, requires no authentication, no user interaction, and no special preconditions. This is the classic "exposed service + unvalidated input" pattern.
• Root cause class: The process does not sufficiently validate, bound, or sanitize data received as part of the connection process (handshake, framing, or connection metadata). CWE-20 is a parent class covering length, type, format, and structural validation failures; the description does not narrow this to a specific sub-CWE, so all sub-classes remain plausible (e.g., missing length checks, unvalidated message fields, improper type handling).
• Impact semantics: The CVSS subscores are decisive: C:N/I:H/A:N means no confidentiality loss, high integrity loss, no availability loss. The vulnerability is therefore an injection primitive, not an information-disclosure or denial-of-service primitive. The attacker can cause the system to accept, store, or propagate data it should not have.
• Why "injection" matters in an ALE context: ALE aggregates location and presence telemetry (typically Northbound/Southbound API traffic from controllers and access points). Integrity compromise of this pipeline means downstream consumers — dashboards, analytics engines, presence/location applications, and any systems fed from ALE — may act on falsified data. The trust boundary being crossed is the socket ingestion boundary.

Data quality caveat: Affected version list, OSV package mappings, and a specific vendor patch are absent from the supplied intelligence. Any operational scoping must therefore be performed by asset owners against their own inventory of ALE deployments rather than by version string.

Exploitation Scenarios

No public exploit code exists (Exploit Code: NO; Nuclei template: NO), although PoC/Exploit status is flagged Public, which should be read as "public proof-of-concept material is referenced" rather than "a weaponized, template-mapped exploit is available." The chain below is inferred at the vulnerability-class level; no specific craftable bytes, message structures, or function calls are asserted because none are disclosed.

1. Reconnaissance / target identification. The attacker enumerates the network for exposed ALE socket listeners using the Shodan dorks above or internal scanning of the management/data plane segment where ALE sits (typically adjacent to or reachable from the WiFi controller and AP management networks). Because exploitation requires no credentials (PR:N), any reachable socket endpoint is a candidate.
2. Triggering the flaw. The attacker establishes a socket connection to the exposed ALE service and supplies malicious input during the connection process — i.e., in the data exchanged as the connection is established/handled by the impacted process. The class of failure (CWE-20) is triggered whenever the component accepts input that violates its expected format, type, structure, or bounds without rejecting it. The exact malformed field is not disclosed publicly.
3. Payload / execution method. This is an injection, not RCE. The crafted input is accepted by the process and enters ALE's normal data-handling path, where it is treated as legitimate data (e.g., submitted location/telemetry data) rather than rejected as malformed. No memory-corruption or code-execution step is described or implied by the C:N/I:H/A:N vector.
4. Post-exploitation impact. The injected data is persisted and/or propagated through the ALE pipeline (integrity impact HIGH). Downstream consumers of ALE data — analytics dashboards, presence/location applications, automated workflows keyed to location events — receive falsified input. There is no confidentiality breach and no service outage from this CVE alone.

Attacker prerequisites: network reachability (direct or via an allowed path) to the ALE socket endpoint; no credentials, no user interaction. Public tooling: none mapped (no Nuclei template, no exploit code in tracked sources).

Impact Assessment

• Business impact: Data-integrity compromise of an analytics/location telemetry platform. Falsified location/presence data can drive incorrect business decisions, corrupt historical analytics, and taint any compliance or reporting outputs derived from ALE. In environments where location data feeds security or safety workflows, injection could misdirect those workflows.
• Affected systems: Deployments of the Aruba Networks Analytics and Location Engine with a network-exposed socket interface. Exact version scoping is unavailable in the provided data — treat all internet- or management-network-reachable ALE instances as potentially affected and verify with the vendor.
• Blast radius: Bounded to the ALE component and its data consumers — no confidentiality or availability impact per the CVSS vector, so pivot to further compromise is not implied. Blast radius is logical (poisoned data propagating to many downstream consumers) rather than fleet-wide compromise.
• CVSS 3.1 subscores (7.5 HIGH): AV:N (remotely exploitable), AC:L (no specialized conditions), PR:N (unauthenticated), UI:N (no victim interaction), S:U (impact confined to the vulnerable component's security scope), C:N/I:H/A:N (high integrity only). Temporal/environmental scores are not published.
• Exploitation likelihood: EPSS 0.00465 (≈0.5%, 37.8th percentile) — below-median near-term exploitation probability. Not in CISA KEV. No exploit code, no Nuclei template. Risk is currently driven by exposure of the socket service rather than by active exploitation in the wild.

Detection Guidance

Sigma Rule

title: Aruba ALE Socket Input Validation Bypass - Suspicious Inbound Connection Pattern
id: 8f3c1a92-4d5e-4b21-9c77-767110000001
status: experimental
description: Detects anomalous inbound socket connections to the Aruba Analytics and Location Engine (ALE) service, consistent with attempts to inject crafted input during the connection process (CVE-2026-76711, CWE-20).
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-76711
author: valtersit.com Threat Intelligence
date: 2026/01/01
logsource:
  category: network_connection
  product: windows
detection:
  selection_ports:
    - DestinationPort: 8080
    - DestinationPort: 8443
    - DestinationPort: 9000
  selection_pattern:
    - Initiated: 'false'
  filter_known:
    - SourceIp:
      - '10.0.0.0/8'
      - '172.16.0.0/12'
      - '192.168.0.0/16'
  condition: selection_ports and selection_pattern and not filter_known
falsepositives:
  - Legitimate remote management or monitoring agents connecting to ALE
  - Port values are deployment-specific and must be tuned to the local ALE listener
level: medium
tags:
  - attack.t1190
  - cve.2026-76711

YARA Rule

rule CVE_2026_76711_Aruba_ALE_Socket_Injection_Indicators
{
    meta:
        description = "Detects log/telemetry artifacts indicating crafted socket input against Aruba ALE (CVE-2026-76711, CWE-20)"
        author = "valtersit.com Threat Intelligence"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-76711"
        date = "2026-01-01"
        severity = "high"

    strings:
        $ale = "Analytics and Location Engine" ascii wide nocase
        $proc = "ale" ascii wide nocase
        $cve = "CVE-2026-76711" ascii wide
        $sock = "socket" ascii wide nocase
        $conn = "connection" ascii wide nocase
        $invalid = "invalid input" ascii wide nocase
        $malformed = "malformed" ascii wide nocase
        $inject = "injection" ascii wide nocase
        $unauth = "unauthenticated" ascii wide nocase

    condition:
        uint16(0) == 0x5A4D or uint32(0) == 0x464C457F or true
        and 2 of ($ale, $proc, $cve, $sock, $conn, $invalid, $malformed, $inject, $unauth)
}

Suricata IDS Rule

alert tcp any any -> any any (msg:"CVE-2026-76711 Aruba ALE improper socket input handling - possible unauthenticated data injection attempt"; flow:established,to_server; content:"|7B|"; depth:1; byte_test:4,>,4096,0,relative; classtype:attempted-admin; reference:cve,2026-76711; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-76711; metadata:affected_product Aruba_ALE, attack_target Server, deployment Perimeter, signature_severity Major, created_at 2026_01_01; sid:7671101; rev:1;)

Note: this is a behavioral placeholder signature. Because no protocol schema, ports, or byte patterns are disclosed for CVE-2026-76711, operators must tune ports, content matches, and thresholds against their own ALE traffic captures before enabling. Do not treat the above as a validated protocol signature.

Elastic Detection

sequence by source.ip with maxspan=30s
  [ network where network.direction == "inbound" and destination.port in (8080, 8443, 9000) ]
  [ network where network.direction == "inbound" and network.bytes > 10000 and destination.port in (8080, 8443, 9000) ]

Tune port lists and network.bytes to the local ALE deployment; the intent is to flag unauthenticated inbound sessions that push anomalous volumes toward the ALE listener.

Splunk SPL Query

index=network OR index=firewall
(dest_port=8080 OR dest_port=8443 OR dest_port=9000)
| stats count sum(bytes) as total_bytes dc(src) as src_count by src_ip dest_ip dest_port
| where (total_bytes > 50000 OR src_count > 20)
| sort - total_bytes
| table src_ip dest_ip dest_port count total_bytes src_count

Adjust index, port list, and thresholds to the local environment; correlation across many short unauthenticated sessions to the ALE listener is the signal of interest.

Wazuh OSSEC Rule

<group name="aruba,ale,cve-2026-76711,">
  <rule id="767110" level="10">
    <decoded_as>json</decoded_as>
    <field name="product">ale</field>
    <match>CVE-2026-76711|invalid input|malformed connection|unauthenticated socket</match>
    <description>CVE-2026-76711: Possible unauthenticated crafted socket input against Aruba ALE</description>
    <mitre>
      <id>T1190</id>
    </mitre>
    <group>attack,database_integrity,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source). No vendor fix, no fixed version string, and no official workaround are present in the supplied intelligence. The actions below are containment measures, not a validated remediation.

1. Immediate mitigations (reduce attack surface now):
   • Remove network reachability to the ALE socket listener from untrusted and lateral segments. Restrict access with firewall/ACL policy to known-good controller/AP management sources only; never expose ALE directly to the internet.
   • Segment the ALE host into a dedicated management VLAN with strict east-west controls; treat all inbound socket connections as untrusted until validated by policy.
   • Where the platform supports it, front the listener with a protocol-aware proxy or WAF/IPS rule set that enforces message format and length constraints before traffic reaches ALE (validate with local traffic baselining first — no public schema exists).
   • Enable verbose logging and integrity monitoring on ALE data stores to detect injected/implausible records early.
   • Monitor vendor channels continuously — the situation is likely to change; a vendor advisory or fixed build may appear at any time.
2. Patch / upgrade steps:
   • No patch is currently available per tracked sources. Do not assume a version is safe based on version numbers alone.
   • Open a case with Aruba Networks (HPE) support referencing CVE-2026-76711 to obtain the official fixed release and affected-version matrix, and subscribe to Aruba security advisories for notification.
   • Once a fixed build is published: inventory all ALE instances, back up configuration and data, apply the vendor update during a change window, and re-verify that the listener is not externally reachable after upgrade.
3. Long-term hardening:
   • Adopt a zero-trust posture for telemetry ingestion — authenticated, mutually-authenticated transport (mTLS) for every socket producer; reject unauthenticated connections by design.
   • Enforce schema validation and strict bounds checks at every ingestion boundary and add negative/fuzz testing to the ALE data pipeline.
   • Maintain continuous exposure management (periodic external and internal scanning for ALE listeners) with alerting on any new network exposure.
   • Add integrity attestation or signed records for the ALE data pipeline so downstream consumers can detect tampering.
   • Track EPSS and KEV; if the EPSS score rises or the CVE is added to KEV, escalate to emergency change management.
   • Review CWE-20 remediation broadly across custom parsers and socket handlers in the environment — this class of flaw is systemic.

References

• NVD — CVE-2026-76711: https://nvd.nist.gov/vuln/detail/CVE-2026-76711
• CWE-20 — Improper Input Validation: https://cwe.mitre.org/data/definitions/20.html
• MITRE ATT&CK T1190 — Exploit Public-Facing Application: https://attack.mitre.org/techniques/T1190/
• CISA Known Exploited Vulnerabilities Catalog (CVE-2026-76711 not listed as of this report): https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• Aruba Networks / HPE Security Advisories (monitor for the official advisory and fixed release; none identified in tracked sources at time of writing): https://www.arubanetworks.com/support-services/security-bulletins/

Exploit-in-the-wild status: No public exploit code, no Nuclei template, and no CISA KEV listing. No named threat-actor campaign is associated with CVE-2026-76711 in the available data. EPSS 0.00465 (37.8th percentile) indicates below-median near-term exploitation likelihood; the primary risk driver is exposed, unauthenticated socket reachability to ALE deployments pending a vendor patch.