--- title: Infosec researchers mull curious case of Telnet ancient flaw description: GreyNoise researchers observed a 65% drop in global Telnet traffic on January 14, six days before CVE-2026-24061 (a critical root access vulnerability) was... canonical: https://daily.dev/posts/infosec-researchers-mull-curious-case-of-telnet-ancient-flaw-kzhismy5k twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Infosec researchers mull curious case of Telnet ancient flaw | daily.dev og:description: GreyNoise researchers observed a 65% drop in global Telnet traffic on January 14, six days before CVE-2026-24061 (a critical root access vulnerability) was... og:url: https://daily.dev/posts/infosec-researchers-mull-curious-case-of-telnet-ancient-flaw-kzhismy5k og:image: https://api.daily.dev/og/posts/kzHISMy5k.png og:image:alt: Infosec researchers mull curious case of Telnet ancient flaw 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. # Infosec researchers mull curious case of Telnet ancient flaw **[The Register](https://daily.dev/sources/theregister)** · 3 min read · 0 upvotes · 0 comments ## Summary GreyNoise researchers observed a 65% drop in global Telnet traffic on January 14, six days before CVE-2026-24061 (a critical root access vulnerability) was publicly disclosed. The sudden traffic decline, affecting specific ISPs while leaving cloud providers unaffected, suggests major transit providers may have received advance warning and implemented port 23 filtering. Evidence includes 18 operators going from hundreds of thousands of sessions to zero within hours, timing aligned with US maintenance windows, and filtering patterns consistent with Tier 1 backbone changes rather than gradual behavioral shifts. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [2026-01-14: The Day the telnet Died – GreyNoise Labs](https://daily.dev/posts/2026-01-14-the-day-the-telnet-died-greynoise-labs-h8gd1lqll) · Hacker News · 0 upvotes · 0 comments - [Reports of Telnet’s Death Have Been Greatly Exaggerated — Terrace Networks](https://daily.dev/posts/reports-of-telnet-s-death-have-been-greatly-exaggerated-terrace-networks-vizsgsfus) · Hacker News · 1 upvotes · 0 comments - [Telnet vulnerability opens door to remote code execution as root](https://daily.dev/posts/telnet-vulnerability-opens-door-to-remote-code-execution-as-root-qqcwhyxc3) · CSO Online · 2 upvotes · 0 comments - [Asia Fumbles With Throttling Back Telnet Traffic in Region](https://daily.dev/posts/asia-fumbles-with-throttling-back-telnet-traffic-in-region-y3qfekbhn) · Dark Reading · 0 upvotes · 0 comments --- Tags: [#cyber](https://daily.dev/tags/cyber), [#networking](https://daily.dev/tags/networking), [#security](https://daily.dev/tags/security), [#vulnerability](https://daily.dev/tags/vulnerability) [View this post on daily.dev](https://daily.dev/posts/infosec-researchers-mull-curious-case-of-telnet-ancient-flaw-kzhismy5k) ```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":"Infosec researchers mull curious case of Telnet ancient flaw","url":"https://daily.dev/posts/infosec-researchers-mull-curious-case-of-telnet-ancient-flaw-kzhismy5k","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/infosec-researchers-mull-curious-case-of-telnet-ancient-flaw-kzhismy5k"},"datePublished":"2026-02-11T15:45:59.531Z","dateModified":"2026-03-15T05:24:13.376Z","description":"GreyNoise researchers observed a 65% drop in global Telnet traffic on January 14, six days before CVE-2026-24061 (a critical root access vulnerability) was...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/1b6189a97ac1f228358759ad72ba196f?_a=AQAEunF","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/1b6189a97ac1f228358759ad72ba196f?_a=AQAEunF","isAccessibleForFree":true,"articleSection":"The Register","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"The Register","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/66aa2113fdad463992ffcbf0e8963fda","url":"https://daily.dev/sources/theregister"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/infosec-researchers-mull-curious-case-of-telnet-ancient-flaw-kzhismy5k","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"cyber,networking,security,vulnerability","timeRequired":"PT3M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"The Register","item":"https://daily.dev/sources/theregister"},{"@type":"ListItem","position":3,"name":"Infosec researchers mull curious case of Telnet ancient flaw"}]} ```