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High

Format String Vulnerability in D-Link DCS-935L HTTP Handler

IdentifiersCVE-2026-12174CWE-134· Use of Externally-Controlled…

CVE-2026-12174 is a remotely exploitable format string vulnerability affecting D-Link DCS-935L firmware version 1.10.01. The flaw is in the HTTP Handler component, specifically in the snprintf function within /web/cgi-bin/greece/rhea. According to the available description, attacker-controlled data is improperly used as a format string argument, allowing format string processing during request handling. The issue is reachable remotely via the device HTTP interface, and public exploit information has been disclosed.

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ANALYST BRIEF

Impact, mitigation & remediation

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Impact

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

Successful exploitation may allow a remote attacker to cause memory corruption-related effects associated with format string vulnerabilities, including information disclosure, denial of service, and potentially arbitrary code execution, depending on the exact memory layout and exploitability of the target. Available scoring and advisory context indicate high potential impact to confidentiality, integrity, and availability.

Mitigation

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

Until a vendor fix is available, restrict access to the device HTTP management/interface service to trusted administrative networks only, block Internet exposure, place the device behind firewall or ACL controls, and isolate it from untrusted network segments. Where operationally feasible, disable remote administration or remove the device from service. Monitor for unexpected HTTP requests targeting the device and for signs of exploitation against /web/cgi-bin/greece/rhea.

Remediation

Patch, then assume compromise.

Upgrade the D-Link DCS-935L to a vendor-fixed firmware release if one is available. If D-Link has published a security advisory or updated firmware addressing CVE-2026-12174, apply that update as the primary remediation. If no fixed version is currently available, there is no complete remediation short of removing or replacing the affected device or disabling the vulnerable HTTP-exposed functionality.
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.

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Threat actor evidence

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Associated malware

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Detection signatures

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Vendor-by-vendor mapping

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Social activity7

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