--- title: How an attacker can disable your security camera | daily.dev description: Researchers found an unauthenticated denial-of-service flaw in Intelbras IP cameras built on the platform of a popular Chinese manufacturer. The firmware... canonical: https://daily.dev/posts/how-an-attacker-can-disable-your-security-camera-xco74gxlw twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: How an attacker can disable your security camera | daily.dev og:description: Researchers found an unauthenticated denial-of-service flaw in Intelbras IP cameras built on the platform of a popular Chinese manufacturer. The firmware... og:url: https://daily.dev/posts/how-an-attacker-can-disable-your-security-camera-xco74gxlw og:image: https://api.daily.dev/og/posts/xcO74gXlw.png og:image:alt: How an attacker can disable your security camera og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # How an attacker can disable your security camera **[Securelist](https://daily.dev/sources/securelist)** · 6 min read · 0 upvotes · 0 comments ## Summary Researchers found an unauthenticated denial-of-service flaw in Intelbras IP cameras built on the platform of a popular Chinese manufacturer. The firmware upgrade endpoint lacks authentication checks and does not verify the firmware before starting an upgrade, causing a reboot that knocks the camera offline for about a minute. Repeating the request keeps the device offline indefinitely. Intelbras fixed it in firmware R.260804, which now requires authentication before accepting an update. MITRE assigned the issue a candidate ID and rated it Medium severity with a CVSS 4.0 score of 5.1. The affected Mibo Smart app has over 4 million downloads, with Brazil as the largest user base. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How does the Intelbras camera denial-of-service vulnerability work? An unauthenticated HTTP POST request to the firmwareUpgrade_service/Demo endpoint triggers a firmware upgrade and forced reboot, without checking the firmware's validity or any session credentials. A single request takes the camera offline for about a minute, but repeated requests keep it offline indefinitely. The flaw affects Intelbras cameras built on a Chinese OEM platform, including the iM3B-C, iMX C, iM4 C, iM5 SC, iME 360 C, and iM7+ FC models. _Teams hardening IoT device firmware track disclosures like this one on daily.dev._ ### What firmware version fixes the Intelbras camera DoS vulnerability? Firmware version R.260804 fixes the issue by requiring valid cookie and session authentication before accepting a firmware upgrade request. The vulnerable firmware was v240927 for the iM3B-C camera. MITRE assigned the flaw a candidate ID of CAN-2026-2035970 and rated it Medium severity with a CVSS 4.0 score of 5.1. _Developers tracking patch releases for connected devices follow fixes like this on daily.dev._ ### How does authentication work on Intelbras IP cameras using the global.login RPC method? The client sends a username with an empty password, and the camera responds with a challenge containing a temporary session, encryption type, random value, and realm. The client computes an MD5 hash of username:realm:password, then a second MD5 of username:random:first_md5, and sends that back with the username and session ID to complete login and receive an authenticated session. _Engineers evaluating device authentication schemes compare implementation details like this on daily.dev._ ## Similar posts on daily.dev - [Hackers compromise 14,500 Dahua web cameras in 35-day campaign](https://daily.dev/posts/hackers-compromise-14-500-dahua-web-cameras-in-35-day-campaign-qsc9ak4ht) · BleepingComputer · 0 upvotes · 0 comments - ['Hundreds' of Iranian hacking attempts hit IP cameras](https://daily.dev/posts/hundreds-of-iranian-hacking-attempts-hit-ip-cameras-9xpi8yzlr) · The Register · 0 upvotes · 0 comments - [Anyone on the Internet Can Ring Your Doorbell](https://daily.dev/posts/anyone-on-the-internet-can-ring-your-doorbell-phnpjhrsg) · Hacker News · 1 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#cyber](https://daily.dev/tags/cyber), [#firmware](https://daily.dev/tags/firmware) [View this post on daily.dev](https://daily.dev/posts/how-an-attacker-can-disable-your-security-camera-xco74gxlw) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"How an attacker can disable your security camera","url":"https://daily.dev/posts/how-an-attacker-can-disable-your-security-camera-xco74gxlw","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/how-an-attacker-can-disable-your-security-camera-xco74gxlw"},"datePublished":"2026-10-28T10:10:03.106Z","dateModified":"2026-10-28T10:10:56.253Z","description":"Researchers found an unauthenticated denial-of-service flaw in Intelbras IP cameras built on the platform of a popular Chinese manufacturer. 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A single request takes the camera offline for about a minute, but repeated requests keep it offline indefinitely. The flaw affects Intelbras cameras built on a Chinese OEM platform, including the iM3B-C, iMX C, iM4 C, iM5 SC, iME 360 C, and iM7+ FC models. Teams hardening IoT device firmware track disclosures like this one on daily.dev."}},{"@type":"Question","name":"What firmware version fixes the Intelbras camera DoS vulnerability?","acceptedAnswer":{"@type":"Answer","text":"Firmware version R.260804 fixes the issue by requiring valid cookie and session authentication before accepting a firmware upgrade request. The vulnerable firmware was v240927 for the iM3B-C camera. MITRE assigned the flaw a candidate ID of CAN-2026-2035970 and rated it Medium severity with a CVSS 4.0 score of 5.1. 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