CVE-2025-71256: nr Modem DoS Vulnerability Poses High Risk
The National Vulnerability Database has disclosed CVE-2025-71256, a high-severity vulnerability impacting nr modems. This flaw, rated with a CVSS score of 7.5, involves improper input validation that could enable a remote denial of service (DoS) attack. Crucially, successful exploitation requires no additional execution privileges, significantly lowering the bar for attackers.
This vulnerability presents a clear and present danger to operational continuity. A remote DoS against modem infrastructure can cripple network services, disrupt critical communications, and severely impact any organization relying on these devices. The attacker’s calculus here is simple: maximum disruption with minimal effort, leveraging a fundamental flaw in input handling.
Defenders must recognize that unprivileged remote DoS is a direct path to operational paralysis. While specific affected products are not yet detailed by the National Vulnerability Database, organizations utilizing nr modem technology should be on high alert. Proactive measures, including robust network segmentation, strict access controls, and continuous monitoring for anomalous traffic patterns targeting modem interfaces, are paramount to mitigating this threat.
What This Means For You
- If your organization relies on nr modem technology, this unprivileged remote DoS vulnerability (CVE-2025-71256) is a critical operational risk. Immediately assess your exposure, identify all nr modem deployments, and prepare for potential patches or mitigation strategies as more vendor-specific details emerge. Do not wait for an exploit in the wild.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2025-71256: nr Modem DoS - Potential Malformed Request
title: CVE-2025-71256: nr Modem DoS - Potential Malformed Request
id: scw-2026-05-06-ai-1
status: experimental
level: high
description: |
Detects potential exploitation attempts targeting the nr modem DoS vulnerability (CVE-2025-71256) by looking for specific, malformed parameters in web requests that could trigger the improper input validation and lead to a denial of service.
author: SCW Feed Engine (AI-generated)
date: 2026-05-06
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2025-71256/
tags:
- attack.impact
- attack.t1499
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- 'invalid_modem_param'
- 'malformed_nr_data'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2025-71256 | DoS | nr modem |
| CVE-2025-71256 | DoS | Improper Input Validation |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 06, 2026 at 05:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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