{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2021-47969/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.5,"id":"CVE-2021-47969"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Color Notes"],"_cs_severities":["medium"],"_cs_tags":["denial-of-service","application-crash","CVE-2021-47969"],"_cs_type":"threat","_cs_vendors":[],"content_html":"\u003cp\u003eColor Notes 1.4 is susceptible to a denial-of-service vulnerability (CVE-2021-47969). This flaw allows an attacker to crash the application by exploiting its handling of extremely large text inputs. The attack involves crafting a payload consisting of a long, repeated character string, specifically a string of 350,000 characters. By pasting this oversized payload twice into a new note within the application, an attacker can overwhelm the application\u0026rsquo;s resources, leading to a crash and rendering it temporarily unavailable. This vulnerability poses a threat to user productivity and data integrity.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker crafts a malicious payload consisting of a repeated character string of approximately 350,000 characters.\u003c/li\u003e\n\u003cli\u003eAttacker opens the Color Notes 1.4 application.\u003c/li\u003e\n\u003cli\u003eAttacker creates a new note within the application.\u003c/li\u003e\n\u003cli\u003eAttacker pastes the crafted 350,000-character string into the new note field.\u003c/li\u003e\n\u003cli\u003eAttacker pastes the same 350,000-character string again into the same note field.\u003c/li\u003e\n\u003cli\u003eThe application attempts to process the excessively large text input.\u003c/li\u003e\n\u003cli\u003eThe application\u0026rsquo;s resources are exhausted due to the oversized payload.\u003c/li\u003e\n\u003cli\u003eThe application becomes unresponsive and crashes, resulting in a denial-of-service condition.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eThe successful exploitation of this denial-of-service vulnerability results in the Color Notes 1.4 application becoming unresponsive and crashing. Users will be unable to access their notes and may experience data loss or corruption if the application does not properly save data before crashing. While the scope of this vulnerability is limited to a single application, it can still disrupt workflows and cause frustration for affected users. The number of victims is dependent on the usage of Color Notes 1.4.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor for process crashes of Color Notes 1.4 using the process_creation rule included in this brief.\u003c/li\u003e\n\u003cli\u003eImplement input validation and sanitization measures within Color Notes to limit the size of text inputs accepted by the application to prevent similar denial-of-service attacks.\u003c/li\u003e\n\u003cli\u003eConsider deploying the file_event rule included in this brief to monitor for the creation of excessively large text files which could be used as part of the attack.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-16T16:20:34Z","date_published":"2026-05-16T16:20:34Z","id":"https://feed.craftedsignal.io/briefs/2026-05-color-notes-dos/","summary":"Color Notes 1.4 is vulnerable to a denial-of-service attack (CVE-2021-47969) where pasting excessively long character strings into note fields can crash the application, achieved by generating and pasting a 350,000-character payload twice into a new note.","title":"Color Notes 1.4 Denial-of-Service Vulnerability (CVE-2021-47969)","url":"https://feed.craftedsignal.io/briefs/2026-05-color-notes-dos/"}],"language":"en","title":"CraftedSignal Threat Feed — CVE-2021-47969","version":"https://jsonfeed.org/version/1.1"}