Shelly Plug S Gen3 Exploit DoS heap exhaustion
Description
A denial-of-service (DoS) exploit targeting the Shelly Plug S Gen3 device has been reported. The exploit involves heap exhaustion caused by concurrent HTTP connections, leading to a device panic and relay shutdown. The report originates from a community forum post without official vendor confirmation or patch information.
Reddit Discussion
hi guys i found a decent bug in The Firmware of Shellys power outlets and its my first time to find a Exploit!
Should i only post it there or somewhere else also?
and is this how to write a Vulnerability Disclosure?
Links cited in this discussion
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This threat concerns a denial-of-service condition in the Shelly Plug S Gen3 smart power outlet. The vulnerability is triggered by overwhelming the device with concurrent HTTP connections, which exhausts heap memory resources. This exhaustion causes the device to panic and disables the relay function, effectively disrupting normal operation. The information is sourced from a community forum post and lacks official vendor advisory or patch details.
Potential Impact
Successful exploitation results in denial of service by causing the device to panic and turn off its relay, disrupting power control functionality. There is no indication of further compromise or data breach. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, limiting exposure to untrusted networks and restricting access to the device's HTTP interface may reduce risk.
Technical Details
- Source Type
- Subreddit
- cybersecurity
- Reddit Score
- 0
- Discussion Level
- minimal
- Content Source
- reddit_link_post
- Post Type
- link
- Newsworthiness Assessment
- {"score":40,"reasons":["external_link","newsworthy_keywords:exploit","urgent_news_indicators","established_author","very_recent"],"isNewsworthy":true,"foundNewsworthy":["exploit"]}
- Has External Source
- true
- Trusted Domain
- false
Threat ID: 6a91c73facd9273b49258777
Added to database: 08/28/2026, 17:37:03 UTC
Last enriched: 09/08/2026, 03:22:47 UTC
Last updated: 10/01/2026, 22:24:00 UTC
Views: 91
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