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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 passed in a way that results in a format string condition. Because the vulnerable code is reachable through the device's web interface, a remote attacker with access to the HTTP service can trigger the flaw by supplying crafted input to the affected handler. Public disclosure and exploit availability have been reported.

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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.

Successful exploitation may allow an attacker to cause memory corruption–related effects typical of format string vulnerabilities, including process instability or crash, denial of service, unintended memory read leading to information disclosure, and potentially arbitrary memory write that could enable code execution, depending on the exact runtime conditions and exploitability of the target build. The provided scoring indicates high impact to confidentiality, integrity, and availability.

Mitigation

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

Restrict network access to the device's HTTP management interface to trusted administrative hosts only. Do not expose the camera's web interface directly to the Internet. Place affected devices behind firewall rules or network segmentation, disable remote administration where feasible, and isolate or decommission vulnerable devices if patching is not immediately possible. Increased monitoring for suspicious requests to the web interface is also advisable given reported public exploit disclosure.

Remediation

Patch, then assume compromise.

Upgrade the D-Link DCS-935L to a vendor-fixed firmware release if one is available. If no official fix is yet available, monitor D-Link advisories for updated firmware addressing CVE-2026-12174. Because the issue is in the HTTP Handler, remediation should prioritize removing the vulnerable firmware from exposed environments and replacing or isolating affected devices until patched.
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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Exposure mapping

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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

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

Social activity8

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