CVE-2026-76692 Overview
CVE-2026-76692 affects HPE Networking EdgeConnect SD-WAN Gateways. An unauthenticated attacker on an adjacent network can trigger the flaw to read uninitialized stack memory or crash the affected service. The weakness is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Successful exploitation produces two distinct outcomes: disclosure of limited memory contents and denial of service through a system crash. Because the attack vector is adjacent, the attacker must reside on the same logical network segment as the gateway.
Critical Impact
An unauthenticated adjacent attacker can crash HPE EdgeConnect SD-WAN Gateway services or leak uninitialized stack memory, disrupting WAN connectivity for downstream sites.
Affected Products
- HPE Networking EdgeConnect SD-WAN Gateways (see the HPE Security Bulletin for fixed versions)
Discovery Timeline
- 2026-09-15 - CVE-2026-76692 published to the National Vulnerability Database
- 2026-09-16 - Last updated in NVD database
Technical Details for CVE-2026-76692
Vulnerability Analysis
The vulnerability sits in a network-facing service on HPE EdgeConnect SD-WAN Gateways. Processing of adjacent-network input reaches memory that has not been initialized before use. The condition allows attackers to observe residual stack contents or force the service into an unrecoverable state.
HPE describes two exploitation outcomes: a system crash producing a denial of service and disclosure of uninitialized stack memory. Leaked memory may contain fragments of prior request data, pointers, or other transient values that assist follow-on attacks. Refer to the HPE Security Bulletin for the vendor's technical statement.
Root Cause
The defect maps to CWE-200, information exposure. The underlying pattern is use of uninitialized memory in a response or protocol handler. When the service returns a buffer without fully populating it, residual stack data is emitted to the caller.
The same code path is unstable enough that malformed input crashes the process, indicating insufficient bounds or state validation before the buffer is used.
Attack Vector
Exploitation requires network adjacency, meaning the attacker must reach the gateway across a directly attached broadcast domain, VPN tunnel, or peered SD-WAN overlay segment. No authentication or user interaction is required. A single crafted packet or protocol message directed at the vulnerable service is sufficient to trigger either the crash or the memory leak.
HPE has not published proof-of-concept code, and no public exploit is available. See the HPE Security Bulletin for technical details relevant to the vulnerable protocol handler.
Detection Methods for CVE-2026-76692
Indicators of Compromise
- Unexpected restarts, watchdog resets, or process crashes logged by the EdgeConnect gateway service
- Malformed or oversized protocol frames arriving from adjacent-network hosts that immediately precede a service disruption
- Unusual outbound response sizes from the gateway that could indicate leaked memory contents being returned to a probing client
Detection Strategies
- Alert on repeated gateway service restarts or crash dumps within short intervals, which correlate with denial-of-service attempts
- Baseline normal SD-WAN control-plane traffic and flag anomalous packet structures from adjacent-network peers
- Correlate gateway telemetry with upstream Orchestrator logs to identify sessions that trigger abnormal termination
Monitoring Recommendations
- Forward gateway syslog and crash telemetry to a centralized log platform for retention and correlation
- Monitor Layer 2 and overlay peer segments for unauthorized hosts capable of reaching the SD-WAN control plane
- Track EPSS movement for CVE-2026-76692, currently reported at 0.191%, as an early indicator of emerging exploitation attempts
How to Mitigate CVE-2026-76692
Immediate Actions Required
- Apply the firmware update referenced in the HPE Security Bulletin as soon as maintenance windows allow
- Inventory all EdgeConnect SD-WAN Gateways and confirm running firmware against the fixed versions listed by HPE
- Restrict adjacent-network access to gateway management and control-plane interfaces to trusted peers only
Patch Information
HPE has published fixed firmware for HPE Networking EdgeConnect SD-WAN Gateways. Consult the HPE Security Bulletin (hpesbnw05135en_us) for the authoritative list of affected and remediated versions and for upgrade guidance.
Workarounds
- Segment the SD-WAN control plane so only authorized gateway peers can reach the vulnerable service
- Apply access control lists on adjacent networks to block untrusted hosts from the affected protocol port
- Increase monitoring on gateway crash and restart events until firmware patching is complete
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
