{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/application-crash/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.5,"id":"CVE-2021-47972"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Sticky Notes \u0026 Color Widgets 1.4.2"],"_cs_severities":["medium"],"_cs_tags":["denial of service","application crash","cve-2021-47972"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eSticky Notes \u0026amp; Color Widgets 1.4.2 is susceptible to a denial-of-service (DoS) vulnerability. This vulnerability, identified as CVE-2021-47972, allows a remote, unauthenticated attacker to crash the application. By crafting notes containing excessively long character strings, an attacker can exhaust the application\u0026rsquo;s resources, leading to a crash and rendering the application unresponsive. The vulnerability was reported on May 16, 2026.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker opens the Sticky Notes \u0026amp; Color Widgets application.\u003c/li\u003e\n\u003cli\u003eAttacker creates a new note within the application.\u003c/li\u003e\n\u003cli\u003eAttacker pastes a large payload of repeated characters (an excessively long string) into the note\u0026rsquo;s text field.\u003c/li\u003e\n\u003cli\u003eThe application attempts to allocate memory to store the overly large note content.\u003c/li\u003e\n\u003cli\u003eDue to the excessive size of the string, the memory allocation fails or consumes excessive resources.\u003c/li\u003e\n\u003cli\u003eThe application becomes unresponsive as it struggles to process the oversized data.\u003c/li\u003e\n\u003cli\u003eThe application crashes due to resource exhaustion or a memory allocation error.\u003c/li\u003e\n\u003cli\u003eThe Sticky Notes \u0026amp; Color Widgets application is no longer available to the user until restarted.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability results in a denial-of-service condition. The Sticky Notes \u0026amp; Color Widgets application becomes unusable, disrupting the user\u0026rsquo;s workflow. While the vulnerability does not lead to data loss or compromise of the system, it can cause inconvenience and temporary loss of productivity. The CVSS v3.1 base score for this vulnerability is 7.5, indicating a high impact on availability.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor application logs for unusual memory allocation patterns, which could indicate exploitation attempts.\u003c/li\u003e\n\u003cli\u003eImplement input validation to limit the size of notes created within the application to mitigate CVE-2021-47972.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule to identify potential attempts to exploit the denial-of-service vulnerability.\u003c/li\u003e\n\u003cli\u003eConsider contacting the vendor for a patch or update addressing CVE-2021-47972.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-16T16:21:17Z","date_published":"2026-05-16T16:21:17Z","id":"https://feed.craftedsignal.io/briefs/2026-05-sticky-notes-dos/","summary":"Sticky Notes \u0026 Color Widgets 1.4.2 is vulnerable to denial of service via excessively long character strings (CVE-2021-47972), allowing attackers to crash the application.","title":"Sticky Notes \u0026 Color Widgets 1.4.2 Denial of Service Vulnerability (CVE-2021-47972)","url":"https://feed.craftedsignal.io/briefs/2026-05-sticky-notes-dos/"},{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.5,"id":"CVE-2021-47970"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Notes 5.5"],"_cs_severities":["medium"],"_cs_tags":["denial-of-service","cve-2021-47970","application-crash"],"_cs_type":"threat","_cs_vendors":["Macaron"],"content_html":"\u003cp\u003eMacaron Notes 5.5 is susceptible to a denial-of-service (DoS) vulnerability (CVE-2021-47970) that can be triggered by an attacker providing an excessively long string of characters within a note. This can be achieved by generating a string of approximately 350,000 repeated characters and pasting it into a note field within the application. Successful exploitation leads to the application crashing and becoming unresponsive. This vulnerability poses a risk to users who rely on the availability and stability of Macaron Notes for their note-taking and organizational needs. By exploiting this vulnerability, an attacker can disrupt the normal functioning of the application, potentially leading to data loss or user frustration.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker identifies a target user or system running Macaron Notes 5.5.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious payload consisting of a very long string (e.g., 350,000 characters).\u003c/li\u003e\n\u003cli\u003eThe attacker opens the Macaron Notes application.\u003c/li\u003e\n\u003cli\u003eThe attacker creates a new note or modifies an existing note.\u003c/li\u003e\n\u003cli\u003eThe attacker pastes the oversized string into the note\u0026rsquo;s content field.\u003c/li\u003e\n\u003cli\u003eThe application attempts to process the excessively large input.\u003c/li\u003e\n\u003cli\u003eDue to insufficient input validation or memory allocation, the application becomes unresponsive.\u003c/li\u003e\n\u003cli\u003eThe Macaron Notes application crashes, resulting in a denial of service.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eThe successful exploitation of CVE-2021-47970 results in a denial-of-service condition, causing the Macaron Notes 5.5 application to crash. This can lead to data loss if users have unsaved changes. The impact is primarily on individual users of the application who may experience disruption and inconvenience. The vulnerability is rated as HIGH severity with a CVSS v3.1 score of 7.5.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect Macaron Notes Long String DoS Attempt\u0026rdquo; to detect potential attempts to exploit CVE-2021-47970 in application logs.\u003c/li\u003e\n\u003cli\u003eMonitor application logs for unusually long strings being processed by Macaron Notes using the \u0026ldquo;Detect Macaron Notes Crash\u0026rdquo; Sigma rule, and investigate any anomalies.\u003c/li\u003e\n\u003cli\u003eConsider contacting the vendor for a patch or upgrade to a version of Macaron Notes that addresses CVE-2021-47970.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-16T16:20:48Z","date_published":"2026-05-16T16:20:48Z","id":"https://feed.craftedsignal.io/briefs/2026-05-macaron-notes-dos/","summary":"Macaron Notes 5.5 is vulnerable to a denial-of-service condition (CVE-2021-47970) due to its handling of excessively long character strings in notes, leading to application crashes.","title":"Macaron Notes 5.5 Denial of Service Vulnerability (CVE-2021-47970)","url":"https://feed.craftedsignal.io/briefs/2026-05-macaron-notes-dos/"},{"_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 — Application Crash","version":"https://jsonfeed.org/version/1.1"}