Skip to main content

CVE-2025-6881: Buffer Overflow in D-Link DI-8100

High
VulnerabilityCVE-2025-6881cvecve-2025-6881
Published: Mon Jun 30 2025 (06/30/2025, 01:32:05 UTC)
Source: CVE Database V5
Vendor/Project: D-Link
Product: DI-8100

Description

A vulnerability was found in D-Link DI-8100 16.07.21. It has been rated as critical. Affected by this issue is some unknown functionality of the file /pppoe_base.asp of the component jhttpd. The manipulation of the argument mschap_en leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

AI-Powered Analysis

AILast updated: 06/30/2025, 02:09:28 UTC

Technical Analysis

CVE-2025-6881 is a critical buffer overflow vulnerability identified in the D-Link DI-8100 router, specifically in version 16.07.21 of its firmware. The vulnerability resides in the jhttpd component, within the /pppoe_base.asp file. It is triggered by manipulating the 'mschap_en' argument, which leads to a buffer overflow condition. This flaw can be exploited remotely without requiring user interaction or authentication, making it highly accessible to attackers. The buffer overflow could allow an attacker to execute arbitrary code on the affected device, potentially leading to full compromise of the router. Given that the vulnerability affects a network-facing service, exploitation could result in denial of service, unauthorized access, or the insertion of malicious firmware or commands. The CVSS v4.0 score of 8.7 (high severity) reflects the ease of remote exploitation (attack vector: network), lack of required privileges or user interaction, and the high impact on confidentiality, integrity, and availability. Although no public exploits are currently known to be in the wild, the disclosure of the exploit code increases the risk of imminent attacks. The vulnerability's presence in a widely deployed router model used in enterprise and home networks underscores the importance of timely mitigation to prevent potential widespread compromise.

Potential Impact

For European organizations, this vulnerability poses a significant risk, especially for those relying on the D-Link DI-8100 router in their network infrastructure. Successful exploitation could lead to unauthorized network access, interception or manipulation of sensitive data, disruption of network services, and potential lateral movement within corporate networks. Critical sectors such as finance, healthcare, telecommunications, and government agencies could face operational disruptions and data breaches. The remote and unauthenticated nature of the exploit increases the likelihood of automated attacks and worm-like propagation within vulnerable networks. Additionally, compromised routers could be leveraged as entry points for broader cyber espionage or ransomware campaigns targeting European entities. The impact extends beyond confidentiality and integrity to availability, as attackers could disrupt internet connectivity or degrade network performance.

Mitigation Recommendations

1. Immediate firmware update: Organizations should verify if D-Link has released a patched firmware version for the DI-8100 model and apply it without delay. 2. Network segmentation: Isolate vulnerable routers from critical internal networks to limit potential lateral movement. 3. Access control: Restrict remote management interfaces and disable unnecessary services, especially those exposing the jhttpd component. 4. Intrusion detection: Deploy network-based anomaly detection systems to monitor for unusual traffic patterns targeting the /pppoe_base.asp endpoint or attempts to manipulate the 'mschap_en' parameter. 5. Firewall rules: Implement strict firewall policies to block unsolicited inbound traffic to the router's management ports from untrusted networks. 6. Vendor engagement: Engage with D-Link support to obtain official patches or mitigation guidance and confirm the vulnerability status of deployed devices. 7. Incident response readiness: Prepare to detect and respond to potential exploitation attempts by updating security monitoring tools with signatures related to this vulnerability. 8. Device replacement: For environments where patching is not feasible, consider replacing affected devices with models not susceptible to this vulnerability.

Need more detailed analysis?Get Pro

Technical Details

Data Version
5.1
Assigner Short Name
VulDB
Date Reserved
2025-06-28T14:46:17.216Z
Cvss Version
4.0
State
PUBLISHED

Threat ID: 6861ee4f6f40f0eb7287e2c2

Added to database: 6/30/2025, 1:54:23 AM

Last enriched: 6/30/2025, 2:09:28 AM

Last updated: 7/14/2025, 9:15:50 PM

Views: 16

Actions

PRO

Updates to AI analysis are available only with a Pro account. Contact root@offseq.com for access.

Please log in to the Console to use AI analysis features.

Need enhanced features?

Contact root@offseq.com for Pro access with improved analysis and higher rate limits.

Latest Threats