Stack-based buffer overflow in D-Link dws/api/Login session cookie handling
CVE-2016-5681 is a stack-based buffer overflow in the dws/api/Login component of multiple D-Link router models. According to the provided content, the flaw is triggered when the device processes an overly long session cookie, causing a stack overwrite in the login handling path. A remote attacker can send a crafted request containing the long session cookie to the vulnerable endpoint and potentially achieve arbitrary code execution on the router. Affected devices include D-Link DIR-850L B1 before 2.07WWB05, DIR-817 Ax, DIR-818LW Bx before 2.05b03beta03, DIR-822 C1 before 3.01WWb02, DIR-823 A1 before 1.00WWb05, DIR-895L A1 before 1.11WWb04, DIR-890L A1 before 1.09b14, DIR-885L A1 before 1.11WWb07, DIR-880L A1 before 1.07WWb08, DIR-868L B1 before 2.03WWb01, and DIR-868L C1 before 3.00WWb01.
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Impact
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Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Recent activity
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A decade-old router vulnerability affecting older Linksys and D-Link router models that was used to spread the AryStinger botnet malware.
An old router vulnerability leveraged by AryStinger to infect outdated Realtek RTL819X router devices for distributed reconnaissance and relay operations.
A legacy vulnerability in D-Link routers that AryStinger reportedly uses to infect older Realtek RTL819X-based devices, especially D-Link DIR-850L systems.
An older vulnerability exploited by the AryStinger botnet to compromise outdated routers, particularly D-Link DIR-850L and DIR-818LW devices.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.