CVE-2025-29635: D-Link DIR-823X Command Injection Vulnerability — CISA KEV Active Exploitation
D-Link DIR-823X contains a command injection vulnerability that allows an authorized attacker to execute arbitrary commands on remote devices by sending a POST request to /goform/set_prohibiting via the corresponding function. The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.
Confirmed active exploitation. CISA KEV catalog confirmed. Federal agencies must remediate by 2026-05-08. Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
⚠ Intelligence Overview
This critical vulnerability in D-Link DIR-823X (CVSS 9.5) represents a significant attack surface for threat actors. CYBERDUDEBIVASH SENTINEL APEX assesses exploitation to be technically feasible with moderate effort. Organizations running DIR-823X in internet-facing or privileged positions face immediate risk. The combination of attack vector, complexity score, and potential impact demands priority-zero remediation.
CISA KNOWN EXPLOITED VULNERABILITY: This vulnerability has been added to the CISA KEV catalog confirming active exploitation. Federal agencies must remediate by 2026-05-08. Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CYBERDUDEBIVASH SENTINEL APEX URGENCY: MAXIMUM. Active exploitation confirmed — treat as active incident requiring immediate response.
🎯 MITRE ATT&CK Mapping
| Category | Mapping |
|---|---|
| Primary Tactic | Initial Access |
| Primary Technique | T1190 — Exploit Public-Facing Application |
| Sub-Technique | T1203 — Exploitation for Client Execution |
| Weakness (CWE) | See NVD entry |
| Intel Type | 🔴 CVE ANALYSIS |
| Source | cisa_kev |
🔴 CVE Reference
| CVE ID | Reference | Score |
|---|---|---|
| CVE-2025-29635 | NVD → | CVSS 9.5 |
🔍 Detection — Sigma Rule
Deploy across your SIEM (Splunk, Elastic, Microsoft Sentinel, QRadar). SOC Pro subscribers receive pre-compiled SIEM-native query packs.
📡 Detection — YARA Rule
Deploy to endpoint detection tools and threat hunting platforms.
🛡️ SOC Response Playbook
- IMMEDIATE (0-1hr): Identify all instances of DIR-823X in your environment via asset inventory
- IMMEDIATE (0-1hr): Apply vendor patch — no maintenance window exception
- IMMEDIATE (1-2hr): If no patch: implement WAF rules, ACLs, or compensating controls
- SHORT-TERM (2-4hr): Deploy Sigma detection rule to SIEM — validate alert generation
- SHORT-TERM (4-8hr): Review logs for exploitation indicators
- SHORT-TERM (8-24hr): Hunt for post-exploitation: new accounts, lateral movement, persistence
- MANDATORY: CISA KEV deadline 2026-05-08 — document remediation for compliance
- ONGOING: Subscribe to D-Link security advisories for follow-on patches
📎 Intelligence References
Get Critical CVE Alerts Before They Become Incidents
Join 10,000+ SOC analysts receiving daily threat intelligence, detection rules & CVE alerts. Free. No spam. Unsubscribe anytime.
Read by 10,000+ security professionals worldwide · Unsubscribe at any time
Report ID: SENTINEL-CVE-2025-29635-2026-04-27 — Source: cisa_kev
© 2026 CYBERDUDEBIVASH PRIVATE LIMITED
Republication requires written attribution to CYBERDUDEBIVASH SENTINEL APEX
🏢 ENTERPRISE THREAT INTELLIGENCE PLATFORM
Pre-disclosure intel, enriched IOC bundles, deploy-ready SIEM packs, and dedicated analyst support — before threats become headlines.
48hr pre-disclosure · IOC feeds · Custom advisories · White-label reports · Dedicated analyst · MSSP licensing