CVE-2024-33516: Arubanetworks ArubaOS DoS Vulnerability

CVE-2024-33516 Overview

CVE-2024-33516 is an unauthenticated Denial of Service (DoS) vulnerability in the Auth service of ArubaOS. The flaw is reachable over the network through the Process Application Programming Interface (PAPI) protocol used by Aruba controllers. Successful exploitation lets a remote attacker interrupt normal operation of the affected controller without credentials or user interaction. The weakness is classified under [CWE-121] Stack-based Buffer Overflow, indicating a memory corruption condition that crashes the Auth service. HPE Aruba Networking published advisory ARUBA-PSA-2024-004 listing affected ArubaOS versions and fixes.

Critical Impact
An unauthenticated network attacker can crash the ArubaOS Auth service through PAPI, disrupting wireless authentication and controller availability.

Affected Products

ArubaOS running on Mobility Conductor and Mobility Controllers
ArubaOS-managed WLAN Gateways and SD-WAN Gateways
ArubaOS versions prior to fixed releases listed in ARUBA-PSA-2024-004

Discovery Timeline

2024-05-01 - CVE-2024-33516 published to the National Vulnerability Database (NVD)
2025-07-28 - Last updated in the NVD database

Technical Details for CVE-2024-33516

Vulnerability Analysis

The vulnerability resides in the Auth service that handles requests delivered through the PAPI protocol on ArubaOS. PAPI is the proprietary management and control protocol used between Aruba devices and components. A specially crafted PAPI message reaches a function in the Auth service that fails to enforce proper bounds on a stack buffer. The resulting stack-based buffer overflow [CWE-121] corrupts the call frame, causing the Auth service to abort. Because the controller's authentication subsystem terminates, wireless clients cannot complete association or 802.1X authentication. The attack requires no authentication, no user interaction, and low complexity, and is exploitable from any network position with access to PAPI services.

Root Cause

The root cause is insufficient input validation when parsing an attacker-controlled field within a PAPI request inside the Auth service. The handler writes attacker-supplied data into a fixed-size stack buffer without verifying the source length, which overwrites adjacent stack memory and triggers a service crash.

Attack Vector

The attack vector is the network. An attacker sends a malformed PAPI datagram to a reachable ArubaOS controller interface where PAPI is exposed. PAPI traditionally runs over UDP and is intended to remain internal to trusted management segments, but exposure to untrusted networks makes the controller directly reachable. Because no authentication is required, repeated exploitation can sustain a denial of service against the Auth service.

No public proof-of-concept exploit is available for CVE-2024-33516, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the Aruba Networks Security Alert ARUBA-PSA-2024-004 for vendor technical details.

Detection Methods for CVE-2024-33516

Indicators of Compromise

Unexpected restarts or crash dumps of the ArubaOS Auth service (auth process) on Mobility Controllers or Conductors.
Sudden disconnection of large numbers of wireless clients with 802.1X or captive portal authentication failures.
Inbound PAPI (UDP/8211) traffic from sources outside the trusted management VLAN.

Detection Strategies

Monitor controller syslog for repeated process auth crash events and core dumps generated near the time of suspicious PAPI traffic.
Inspect network flow records for anomalous UDP traffic destined for PAPI service ports on controller management interfaces.
Correlate authentication failure spikes with controller process restart events to identify exploitation attempts versus benign outages.

Monitoring Recommendations

Forward ArubaOS logs to a centralized SIEM or data lake and alert on auth process termination, controller reboots, and PAPI parse errors.
Deploy IDS/IPS signatures that flag malformed PAPI packets and unusual PAPI sources external to the management plane.
Track wireless client association failure rates as a leading indicator of Auth service disruption.

How to Mitigate CVE-2024-33516

Immediate Actions Required

Upgrade ArubaOS to a fixed release as identified in advisory ARUBA-PSA-2024-004 for your branch.
Restrict PAPI (UDP/8211) so it is reachable only from trusted management subnets and Aruba infrastructure peers.
Enable Enhanced PAPI Security with a non-default key on all controllers and access points to authenticate PAPI messages.

Patch Information

HPE Aruba Networking released fixed ArubaOS versions for the 8.x and 10.x branches addressing CVE-2024-33516. Apply the upgrade path listed in the Aruba Networks Security Alert ARUBA-PSA-2024-004. Older end-of-maintenance branches remain vulnerable and require migration to a supported release.

Workarounds

Block external access to PAPI by enforcing ACLs and firewall rules around controller management interfaces.
Place Mobility Conductors and Controllers in a dedicated, isolated management VLAN with no direct user-network exposure.
Use the firewall cp control-plane policy to rate-limit and filter unsolicited PAPI traffic until patches are applied.

bash

# ArubaOS control-plane policy example to restrict PAPI exposure
configure terminal
firewall cp
  deny udp any any eq 8211
  permit udp <trusted-mgmt-subnet> <mask> any eq 8211
  exit
write memory