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Mallory
CriticalCISA KEVExploited in the wildPublic exploit

Command injection in D-Link DNS-320 system_mgr.cgi leading to RCE

IdentifiersCVE-2020-25506CWE-78· Improper Neutralization of Special…

D-Link DNS-320 firmware v2.06B01 (Revision Ax) contains a command injection vulnerability in the system_mgr.cgi component. Improper handling of attacker-controlled input allows injection of shell metacharacters/commands into OS command execution, resulting in remote arbitrary code execution on the device.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Remote attackers can achieve arbitrary command execution on affected D-Link DNS-320 NAS devices, enabling full compromise of the device (e.g., executing malware, altering configuration, accessing/modifying stored data, and using the device as a foothold/botnet node).

Mitigation

If you can’t patch tonight, do this now.

If patching is not possible, remove management interfaces from internet exposure; restrict access to the CGI endpoint via network ACLs/VPN; place the device behind a firewall; disable/limit remote administration features; monitor for exploitation attempts against system_mgr.cgi and for post-compromise indicators (unexpected processes, outbound connections, dropped scripts/binaries).

Remediation

Patch, then assume compromise.

Upgrade/patch D-Link DNS-320 firmware to a version that addresses CVE-2020-25506 (vendor-fixed release, if available for the specific hardware revision). If the device is end-of-life and no fixed firmware exists, replace the device with a supported model.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
D-LinkDns-320 Firmwareoperating_system

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What this page doesn’t show

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Exposure mapping

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Threat actor evidence1

Every observed campaign linking this CVE to a named adversary.

Associated malware1

Malware families riding this exploit, with evidence and IOCs.

Detection signatures2

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

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