CVE-2021-47971
📛 CVE Title
(no title)
Description
My Notes Safe 5.3 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings into note fields. Attackers can generate a payload containing 350000 repeated characters and paste it twice into a new note to trigger an application crash.
Overview
- State
- —
- Assigner (CNA)
- —
- CVSS severity
- high
- CVSS score
- 7.5 / 10
- CVSS vector
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Effective score
- 7.5 / 10 HIGH source: CNA overview
- CWE(s)
- —
- Reserved
- —
- Published
- —
- Last updated
- —
- Source
- https://www.tenable.com/cve/CVE-2021-47971
- Linked Threat
- CVE-2021-47971 — CVE-2021-47971
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-16 16:16:22 UTC
- NVD last modified
- 2026-05-18 17:32:04 UTC
- NVD CVSS v3.1
- 7.5 / 10 HIGH source: disclosure@vulncheck.com
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Exploitability subscore
- 3.9 / 10
- Impact subscore
- 3.6 / 10
- EPSS score
- 0.0005 (probability of exploitation in next 30 days)
- EPSS percentile
- 16.41% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD-assigned CWE(s):
CWE-789
(differs from the CNA list above)
NVD / KEV / EPSS data refreshed 2026-05-25 00:06 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2021-34828 - Assigner
- VulnCheck
- Published
- May 16, 2026, 3:26:12 PM
- Updated
- May 18, 2026, 6:50:19 PM
- EUVD base score (CVSS 4.0)
-
8.7 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - EUVD-reported EPSS
- 0.0500
- Vendors
- my-notes-safe
- Products
-
My Notes Safe (5.3)
- Aliases
-
GHSA-w4w9-25xj-f9j4
ENISA description: My Notes Safe 5.3 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings into note fields. Attackers can generate a payload containing 350000 repeated characters and paste it twice into a new note to trigger an application crash.
Vendor references (0)
References embedded in the original CVE record by the assigning CNA.
None in the CVE record.
Web references (5)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://nvd.nist.gov/vuln/detail/CVE-2021-47971 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2021-47971 tenable:www.cve.org
- https://www.exploit-db.com/exploits/49954 tenable:www.exploit-db.com
- https://www.first.org/epss/ tenable:www.first.org
- https://www.vulncheck.com/advisories/my-notes-safe-denial-of-service-via-buffer-overflow tenable:www.vulncheck.com
NVD-tagged references (2)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://www.exploit-db.com/exploits/49954 disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/my-notes-safe-denial-of-service-via-buffer-overflow disclosure@vulncheck.com
Remediations (10)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:attack.mitre.org
This mitigation can be implemented through the following measures: Regular Operating System Updates Implementation: Apply the latest Windows security updates monthly using WSUS (Windows Server Update Services) or a similar patch management solution. Configure systems to check for updates automatically and schedule reboots during maintenance ...
2026-05-26 02:55 UTC -
web:learn.microsoft.com
Use the DISM tool to fix problems that prevent Windows Update from installing successfully.
2026-05-26 02:55 UTC -
web:securitricks.com
CVE CVE-2021-47971 - Score : 8.7 - Source : disclosure@vulncheck.com - Description : My Notes Safe 5.3 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings into note fields. Attackers can generate a payload containing 350000 repeated characters and paste it twice into a new note to trigger an application crash ...
2026-05-26 02:55 UTC -
web:securityboulevard.com
Vulnerability remediation is the process of identifying, addressing, and resolving security vulnerabilities in systems, networks, or applications to eliminate potential threats. It involves fixing the root cause of the vulnerability, often through actions such as applying security patches, updating software, reconfiguring systems, or rewriting insecure code. Remediation aims to provide a ...
2026-05-26 02:55 UTC -
web:www.bugcrowd.com
Vulnerability mitigation is typically considered a temporary or interim solution. While mitigation measures can reduce the immediate risk associated with vulnerabilities, they may not provide a permanent fix . Organizations should aim to prioritize and plan for complete vulnerability remediation whenever feasible and allocate resources accordingly.
2026-05-26 02:55 UTC -
web:www.cve.org
At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures
2026-05-26 02:55 UTC -
web:www.emagined.com
Discover the difference between mitigation and remediation in vulnerability management. Learn best practices for Pentest remediation and effective cyber protection.
2026-05-26 02:55 UTC -
web:www.oracle.com
Oracle Critical Patch Update Advisory - April 2021 Description A Critical Patch Update is a collection of patches for multiple security vulnerabilities. These patches address vulnerabilities in Oracle code and in third-party components included in Oracle products. These patches are usually cumulative, but each advisory describes only the security patches added since the previous Critical Patch ...
2026-05-26 02:55 UTC -
web:www.secure.com
Learn the difference between vulnerability remediation and mitigation , and how a risk-based strategy can strengthen your security posture.
2026-05-26 02:55 UTC -
web:www.strongboxit.com
Vulnerability remediation is the process of identifying, addressing, and resolving security vulnerabilities in systems, networks, or applications to eliminate potential threats. It involves fixing the root cause of the vulnerability, often through actions such as applying security patches, updating software, reconfiguring systems, or rewriting insecure code. Remediation aims to provide a ...
2026-05-26 02:55 UTC
AI Forensic Analysis
Only Available for Registered Users. Sign in to view.